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Speed CUT

2004-05-18 16:18:00

Hi All, I just got a unichip installed in my 93 Supra TT AUTOMATIC, it succesfully removed the boost cut which is awesome. It couldn't do the speed cut though because it's an auto. Does anyone know which speed limit cut controllers work on the auto MKIV Supra thanks Dave

Re: Speed CUT

2004-05-18 16:26:00

On Tue, 18 May 2004 16:14, David Gillard wrote:
> Hi All,
>
> I just got a unichip installed in my 93 Supra TT AUTOMATIC, it
> succesfully removed the boost cut which is awesome.
> It couldn't do the speed cut though because it's an auto.
> Does anyone know which speed limit cut controllers work on the auto MKIV
> Supra
> thanks
> Dave

Do you know HOW it removed the boost cut?
because.. a poor method can be a BIG risk to
your engine and turbos..

Regards,
Stuart.

Re: Speed CUT

2004-05-18 16:37:00

it was installed and tuned professionally by Technik Tuning
I am sure its alot safer than using a BCC. Jspec supras have MAP
sensor CUT

----- Original Message -----
From: Stuart <stuartw@kcbbs.gen.nz>
Date: Tuesday, May 18, 2004 2:26 pm
Subject: Re: [sconz] Speed CUT

> On Tue, 18 May 2004 16:14, David Gillard wrote:
> > Hi All,
> >
> > I just got a unichip installed in my 93 Supra TT AUTOMATIC, it
> > succesfully removed the boost cut which is awesome.
> > It couldn't do the speed cut though because it's an auto.
> > Does anyone know which speed limit cut controllers work on the
> auto MKIV
> > Supra
> > thanks
> > Dave
>
> Do you know HOW it removed the boost cut?
> because.. a poor method can be a BIG risk to
> your engine and turbos..
>
> Regards,
> Stuart.
>
> ---
> Supra Club of New Zealand
> http://www.supras.org.nz/
>

Re: Speed CUT

2004-05-18 16:42:00

On Tue, 18 May 2004 16:36, David Gillard wrote: > it was installed and tuned professionally by Technik Tuning > I am sure its alot safer than using a BCC. Jspec supras have MAP > sensor CUT yes yes, I know a reasonable bit about how the engines operate. did they fit larger injectors at the same time? Regards, Stuart.

Re: Speed CUT

2004-05-18 17:03:00

nah the car is only running 15PSI just over 200KW at wheels, they said
duty was a little low if anything I think stock injectors are 440CC
200RW is around 350HP I am guessin
Any ideas on how to get rid f the speed cut on Automatic
Only thing I have come across is a HKS SCD but it's pretty pricey for
what it does, hoping to get a greddy one or something.

----- Original Message -----
From: Stuart <stuartw@kcbbs.gen.nz>
Date: Tuesday, May 18, 2004 2:42 pm
Subject: Re: [sconz] Speed CUT

> On Tue, 18 May 2004 16:36, David Gillard wrote:
> > it was installed and tuned professionally by Technik Tuning
> > I am sure its alot safer than using a BCC. Jspec supras have MAP
> > sensor CUT
>
> yes yes, I know a reasonable bit about how the engines operate.
>
> did they fit larger injectors at the same time?
>
> Regards,
> Stuart.
>
> ---
> Supra Club of New Zealand
> http://www.supras.org.nz/
>

Re: Speed CUT

2004-05-18 17:11:00

On Tue, 18 May 2004 16:58, David Gillard wrote:
> nah the car is only running 15PSI just over 200KW at wheels, they said
> duty was a little low if anything I think stock injectors are 440CC
> 200RW is around 350HP I am guessin
> Any ideas on how to get rid f the speed cut on Automatic
> Only thing I have come across is a HKS SCD but it's pretty pricey for
> what it does, hoping to get a greddy one or something.

The only method that can be done is to use a speed cut defender, such as the
hks one. Be aware that these can need tuning to get them set up correctly,
and that a miss-tuned one can have a bad effect on ABS and auto control (but
then again, would you really want to be using ABS at those speeds?)

If they did not install larger injectors, then they cannot have changed your
boost cut - if they did then it was in a DANGEROUS way. the ECU does not have
ignition or fuel maps above it's predefined cut point, and the unichip system
relies on the existing fuel maps (think of it as a fuel map fine tuner..)

Of course, that is no problem while you are running below fuel cut.
be very careful - the Mk.4 has a habit of developing boost creep when you up
it's boost levels, due to an undersized waste gate system, which can lead to
turbo-killing overboost. I assume you have fitted a decent and fast reacting
boost guage? one with a peak-hold feature (analogue or digital) would be a
very good idea, because it's hard to be looking at the boost guage all the
time on full boost ;)

Regards,
Stuart.

Re: Speed CUT

2004-05-18 17:28:00

On Tue, 18 May 2004 17:11, Stuart wrote:
> On Tue, 18 May 2004 16:58, David Gillard wrote:
> > nah the car is only running 15PSI just over 200KW at wheels, they said
> > duty was a little low if anything I think stock injectors are 440CC
> > 200RW is around 350HP I am guessin
> > Any ideas on how to get rid f the speed cut on Automatic
> > Only thing I have come across is a HKS SCD but it's pretty pricey for
> > what it does, hoping to get a greddy one or something.

Oh, one more thinkk.
200RW what? kW I guess? that would be 262 HP, which with the around 10%
transmission losses would be around 290HP crank if it were a manual, or about
20% losses and 310HP crank with your auto (highish estimation there, the Mk.4
auto should not be that bad..)
If the 200RW is HP, then that is only about 240HP in your setup, which sounds
very low... too low, so I guess it is Kw.

Regards,
Stuart.

Re: Speed CUT

2004-05-18 17:41:00

your right mate it's Kilowatts for sure I am assuming an even 300HP at
wheels

----- Original Message -----
From: Stuart <stuartw@kcbbs.gen.nz>
Date: Tuesday, May 18, 2004 3:28 pm
Subject: Re: [sconz] Speed CUT

> On Tue, 18 May 2004 17:11, Stuart wrote:
> > On Tue, 18 May 2004 16:58, David Gillard wrote:
> > > nah the car is only running 15PSI just over 200KW at wheels,
> they said
> > > duty was a little low if anything I think stock injectors are
> 440CC> > 200RW is around 350HP I am guessin
> > > Any ideas on how to get rid f the speed cut on Automatic
> > > Only thing I have come across is a HKS SCD but it's pretty
> pricey for
> > > what it does, hoping to get a greddy one or something.
>
> Oh, one more thinkk.
> 200RW what? kW I guess? that would be 262 HP, which with the
> around 10%
> transmission losses would be around 290HP crank if it were a
> manual, or about
> 20% losses and 310HP crank with your auto (highish estimation
> there, the Mk.4
> auto should not be that bad..)
> If the 200RW is HP, then that is only about 240HP in your setup,
> which sounds
> very low... too low, so I guess it is Kw.
>
> Regards,
> Stuart.
>
> ---
> Supra Club of New Zealand
> http://www.supras.org.nz/
>

Re: Speed CUT

2004-05-18 17:43:00

no probs I will get the HKS one I think.

So what your saying is if they didn't upgrade my injectors the unichip
is doing the same thing as a greddy BCC?
cause I can run any PSI without cut or hesitation or smoke.

I did ask them to check if the car was running lean at anytime up to
18PSI and they said no problems.

If I were to upgrade injectors would I have to go a different way about
fuel cut? does the ECU somehow recognise you have upgraded?? whats the
go?

----- Original Message -----
From: Stuart <stuartw@kcbbs.gen.nz>
Date: Tuesday, May 18, 2004 3:11 pm
Subject: Re: [sconz] Speed CUT

> On Tue, 18 May 2004 16:58, David Gillard wrote:
> > nah the car is only running 15PSI just over 200KW at wheels,
> they said
> > duty was a little low if anything I think stock injectors are 440CC
> > 200RW is around 350HP I am guessin
> > Any ideas on how to get rid f the speed cut on Automatic
> > Only thing I have come across is a HKS SCD but it's pretty
> pricey for
> > what it does, hoping to get a greddy one or something.
>
> The only method that can be done is to use a speed cut defender,
> such as the
> hks one. Be aware that these can need tuning to get them set up
> correctly,
> and that a miss-tuned one can have a bad effect on ABS and auto
> control (but
> then again, would you really want to be using ABS at those speeds?)
>
> If they did not install larger injectors, then they cannot have
> changed your
> boost cut - if they did then it was in a DANGEROUS way. the ECU
> does not have
> ignition or fuel maps above it's predefined cut point, and the
> unichip system
> relies on the existing fuel maps (think of it as a fuel map fine
> tuner..)
> Of course, that is no problem while you are running below fuel cut.
> be very careful - the Mk.4 has a habit of developing boost creep
> when you up
> it's boost levels, due to an undersized waste gate system, which
> can lead to
> turbo-killing overboost. I assume you have fitted a decent and
> fast reacting
> boost guage? one with a peak-hold feature (analogue or digital)
> would be a
> very good idea, because it's hard to be looking at the boost guage
> all the
> time on full boost ;)
>
> Regards,
> Stuart.
>
> ---
> Supra Club of New Zealand
> http://www.supras.org.nz/
>

RE: Speed CUT

2004-05-18 17:53:00

The SP2 autotrans speed signal must be defeated as well. The Apexi
rev/speed meter will do this.

-----Original Message-----
From: bounce-33739-25@list.supras.org.nz
[mailto:bounce-33739-25@list.supras.org.nz] On Behalf Of David Gillard
Sent: Tuesday, 18 May 2004 4:59 p.m.
To: Supra Club of NZ Mailing List
Subject: Re: [sconz] Speed CUT

nah the car is only running 15PSI just over 200KW at wheels, they said
duty was a little low if anything I think stock injectors are 440CC
200RW is around 350HP I am guessin
Any ideas on how to get rid f the speed cut on Automatic
Only thing I have come across is a HKS SCD but it's pretty pricey for
what it does, hoping to get a greddy one or something.

Re: RE: Speed CUT

2004-05-18 18:00:00

do I need this in conjunction with something else or it does everything
required?

----- Original Message -----
From: Marc Archbold <marc.a@paradise.net.nz>
Date: Tuesday, May 18, 2004 3:52 pm
Subject: RE: [sconz] Speed CUT

>
> The SP2 autotrans speed signal must be defeated as well. The Apexi
> rev/speed meter will do this.
>
>
> -----Original Message-----
> From: bounce-33739-25@list.supras.org.nz
> [mailto:bounce-33739-25@list.supras.org.nz] On Behalf Of David Gillard
> Sent: Tuesday, 18 May 2004 4:59 p.m.
> To: Supra Club of NZ Mailing List
> Subject: Re: [sconz] Speed CUT
>
>
> nah the car is only running 15PSI just over 200KW at wheels, they
> said
> duty was a little low if anything I think stock injectors are
> 440CC
> 200RW is around 350HP I am guessin
> Any ideas on how to get rid f the speed cut on Automatic
> Only thing I have come across is a HKS SCD but it's pretty pricey
> for
> what it does, hoping to get a greddy one or something.
>
>
> ---
> Supra Club of New Zealand
> http://www.supras.org.nz/
>

RE: RE: Speed CUT

2004-05-18 18:11:00

Well, you could buy a real aftermarket management system instead of
using work-arounds.

-----Original Message-----
From: bounce-33745-25@list.supras.org.nz
[mailto:bounce-33745-25@list.supras.org.nz] On Behalf Of David Gillard
Sent: Tuesday, 18 May 2004 5:58 p.m.
To: Supra Club of NZ Mailing List
Subject: Re: RE: [sconz] Speed CUT

do I need this in conjunction with something else or it does everything
required?

----- Original Message -----
From: Marc Archbold <marc.a@paradise.net.nz>
Date: Tuesday, May 18, 2004 3:52 pm
Subject: RE: [sconz] Speed CUT

>
> The SP2 autotrans speed signal must be defeated as well. The Apexi
> rev/speed meter will do this.
>
>

Re: RE: RE: Speed CUT

2004-05-18 18:17:00

I will eventually this is interim stuff till I get enough cash
has anyone used a SCD on an AUTO

----- Original Message -----
From: Marc Archbold <marc.a@paradise.net.nz>
Date: Tuesday, May 18, 2004 4:10 pm
Subject: RE: RE: [sconz] Speed CUT

>
> Well, you could buy a real aftermarket management system instead of
> using work-arounds.
>
>
>
> -----Original Message-----
> From: bounce-33745-25@list.supras.org.nz
> [mailto:bounce-33745-25@list.supras.org.nz] On Behalf Of David Gillard
> Sent: Tuesday, 18 May 2004 5:58 p.m.
> To: Supra Club of NZ Mailing List
> Subject: Re: RE: [sconz] Speed CUT
>
>
> do I need this in conjunction with something else or it does
> everything
> required?
>
> ----- Original Message -----
> From: Marc Archbold <marc.a@paradise.net.nz>
> Date: Tuesday, May 18, 2004 3:52 pm
> Subject: RE: [sconz] Speed CUT
>
> >
> > The SP2 autotrans speed signal must be defeated as well. The
> Apexi
> > rev/speed meter will do this.
> >
> >
>
>
> ---
> Supra Club of New Zealand
> http://www.supras.org.nz/
>

RE: RE: Speed CUT

2004-05-18 18:41:00

You could - obviously a safer way to go but you have to have someone to test
these "work-arounds" too see if they are any good I guess.....

-----Original Message-----
From: bounce-33747-72@list.supras.org.nz
[mailto:bounce-33747-72@list.supras.org.nz] On Behalf Of Marc Archbold
Sent: Tuesday, 18 May 2004 6:11 p.m.
To: Supra Club of NZ Mailing List
Subject: RE: RE: [sconz] Speed CUT

Well, you could buy a real aftermarket management system instead of
using work-arounds.

-----Original Message-----
From: bounce-33745-25@list.supras.org.nz
[mailto:bounce-33745-25@list.supras.org.nz] On Behalf Of David Gillard
Sent: Tuesday, 18 May 2004 5:58 p.m.
To: Supra Club of NZ Mailing List
Subject: Re: RE: [sconz] Speed CUT

do I need this in conjunction with something else or it does everything
required?

----- Original Message -----
From: Marc Archbold <marc.a@paradise.net.nz>
Date: Tuesday, May 18, 2004 3:52 pm
Subject: RE: [sconz] Speed CUT

>
> The SP2 autotrans speed signal must be defeated as well. The Apexi
> rev/speed meter will do this.
>
>

---
Supra Club of New Zealand
http://www.supras.org.nz/

Re: RE: RE: Speed CUT

2004-05-18 18:54:00

Well Technik Tuning in Thornbury are supposed to be MKIV and Toyota
Specialists and they say its all good and safe as long as I don't boost
over 17-18 PSI

----- Original Message -----
From: Hunt M <5uprah@supras.co.nz>
Date: Tuesday, May 18, 2004 4:40 pm
Subject: RE: RE: [sconz] Speed CUT

> You could - obviously a safer way to go but you have to have
> someone to test
> these "work-arounds" too see if they are any good I guess.....
>
> -----Original Message-----
> From: bounce-33747-72@list.supras.org.nz
> [mailto:bounce-33747-72@list.supras.org.nz] On Behalf Of Marc Archbold
> Sent: Tuesday, 18 May 2004 6:11 p.m.
> To: Supra Club of NZ Mailing List
> Subject: RE: RE: [sconz] Speed CUT
>
>
> Well, you could buy a real aftermarket management system instead of
> using work-arounds.
>
>
>
> -----Original Message-----
> From: bounce-33745-25@list.supras.org.nz
> [mailto:bounce-33745-25@list.supras.org.nz] On Behalf Of David Gillard
> Sent: Tuesday, 18 May 2004 5:58 p.m.
> To: Supra Club of NZ Mailing List
> Subject: Re: RE: [sconz] Speed CUT
>
>
> do I need this in conjunction with something else or it does
> everything
> required?
>
> ----- Original Message -----
> From: Marc Archbold <marc.a@paradise.net.nz>
> Date: Tuesday, May 18, 2004 3:52 pm
> Subject: RE: [sconz] Speed CUT
>
> >
> > The SP2 autotrans speed signal must be defeated as well. The
> Apexi
> > rev/speed meter will do this.
> >
> >
>
>
> ---
> Supra Club of New Zealand
> http://www.supras.org.nz/
>
>
> ---
> Supra Club of New Zealand
> http://www.supras.org.nz/
>

RE: RE: RE: Speed CUT

2004-05-18 19:02:00

Correct me if Im wrong - the Unichip does not disable speed cut or is it
that the Unichip does have a speedcut feature but does not work with
your vehicle?

-----Original Message-----
From: bounce-33750-25@list.supras.org.nz
[mailto:bounce-33750-25@list.supras.org.nz] On Behalf Of David Gillard
Sent: Tuesday, 18 May 2004 6:44 p.m.
To: Supra Club of NZ Mailing List
Subject: Re: RE: RE: [sconz] Speed CUT

Well Technik Tuning in Thornbury are supposed to be MKIV and Toyota
Specialists and they say its all good and safe as long as I don't boost
over 17-18 PSI

----- Original Message -----
From: Hunt M <5uprah@supras.co.nz>
Date: Tuesday, May 18, 2004 4:40 pm
Subject: RE: RE: [sconz] Speed CUT

> You could - obviously a safer way to go but you have to have
> someone to test
> these "work-arounds" too see if they are any good I guess.....
>
> -----Original Message-----
> From: bounce-33747-72@list.supras.org.nz
> [mailto:bounce-33747-72@list.supras.org.nz] On Behalf Of Marc Archbold
> Sent: Tuesday, 18 May 2004 6:11 p.m.
> To: Supra Club of NZ Mailing List
> Subject: RE: RE: [sconz] Speed CUT
>
>
> Well, you could buy a real aftermarket management system instead of
> using work-arounds.
>
>
>
> -----Original Message-----
> From: bounce-33745-25@list.supras.org.nz
> [mailto:bounce-33745-25@list.supras.org.nz] On Behalf Of David Gillard
> Sent: Tuesday, 18 May 2004 5:58 p.m.
> To: Supra Club of NZ Mailing List
> Subject: Re: RE: [sconz] Speed CUT
>
>
> do I need this in conjunction with something else or it does
> everything
> required?
>
> ----- Original Message -----
> From: Marc Archbold <marc.a@paradise.net.nz>
> Date: Tuesday, May 18, 2004 3:52 pm
> Subject: RE: [sconz] Speed CUT
>
> >
> > The SP2 autotrans speed signal must be defeated as well. The
> Apexi
> > rev/speed meter will do this.
> >
> >
>
>
> ---
> Supra Club of New Zealand
> http://www.supras.org.nz/
>
>
> ---
> Supra Club of New Zealand
> http://www.supras.org.nz/
>

---
Supra Club of New Zealand
http://www.supras.org.nz/

Re: Speed CUT

2004-05-18 19:31:00

On Tue, 18 May 2004 18:43, David Gillard wrote:
> Well Technik Tuning in Thornbury are supposed to be MKIV and Toyota
> Specialists and they say its all good and safe as long as I don't boost
> over 17-18 PSI

sorry, been out doing stuff.
Yes, 17ish PSI would be right, because that is the stock fuel cut anyway..
Personally, I would prefer to still have my fuel cut, because then if I
accidentally boost higher, the ECU protects the engine.
Running over fuel cut, where there is no matching fuel or ignition curve, is
just bad.

Of course, you are no doing that, so good on you :)

Regards,
Stuart.

Re: Speed CUT

2004-05-18 19:33:00

On Tue, 18 May 2004 18:16, David Gillard wrote: > I will eventually this is interim stuff till I get enough cash > has anyone used a SCD on an AUTO Yep, kind of. I run a HKS SCD on my JZA70 auto supra, which is pretty similar. Works a treat, after I adjusted it up ;) (not, of course, that I EVER go over 180! that would be BAD!!) Regards, Stuart W.

RE: Speed CUT

2004-05-18 19:37:00

180?? We must be talking MPH :)

-----Original Message-----
From: bounce-33753-72@list.supras.org.nz
[mailto:bounce-33753-72@list.supras.org.nz] On Behalf Of Stuart
Sent: Tuesday, 18 May 2004 7:33 p.m.
To: Supra Club of NZ Mailing List
Subject: Re: [sconz] Speed CUT

On Tue, 18 May 2004 18:16, David Gillard wrote:
> I will eventually this is interim stuff till I get enough cash
> has anyone used a SCD on an AUTO

Yep, kind of.
I run a HKS SCD on my JZA70 auto supra, which is pretty similar.
Works a treat, after I adjusted it up ;)
(not, of course, that I EVER go over 180! that would be BAD!!)

Regards,
Stuart W.

---
Supra Club of New Zealand
http://www.supras.org.nz/

Re: Speed CUT

2004-05-18 19:43:00

On Tue, 18 May 2004 17:43, David Gillard wrote:
> no probs I will get the HKS one I think.
sounds sensible.

> So what your saying is if they didn't upgrade my injectors the unichip
> is doing the same thing as a greddy BCC?
> cause I can run any PSI without cut or hesitation or smoke.
I would say it is acting as a mixture of a greddy BCC (which is a BAD thing if
you ever go over 17-18PSI) and an Apexi AFC (which allows fuel mixture
trimming).

There is a good, if somewhat inaccurate, description of the functioning of a
BCC here:
http://www.mkiv.com/techarticles/bcc/why_bcc/Why_the_GReddy_BCC.htm

I *think* the Mk.4 has fuel maps to 17PSI, but according to the above it only
has them to 14PSI, hmmm. I know my JZA70 has them to 17PSI.
If the above is true then I would say 14psi is the most you should safetly
run.

> I did ask them to check if the car was running lean at anytime up to
> 18PSI and they said no problems.

Running lean is not the problem, these cars MUST run very rich onb boost, as
the extra fuel works to control detonation and to significantly lower
combustion temperatures, without the right amount of rich, you will blow
engines - this is part of the reason Mk.4 people have a tendency to melt
pistons and cook turbos, because they don't run rich enough.

> If I were to upgrade injectors would I have to go a different way about
> fuel cut? does the ECU somehow recognise you have upgraded?? whats the
> go?

Yes, and No.
You need something to significantly re-tune the ECU to match the larger
injectors - the unichip may have enough range to do it.

basically, if your injectors are 20% larger, you can run 20% more boost (that
is a simplification, but it's ballpark right).

Regards,
Stuart W.

Re: Speed CUT

2004-05-18 19:49:00

<glen>

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my (little)1g has no speed cut and a 330kph analogue speedo..=0D
does anyone know if this would be factory...its a 91 jap spec=0D
=0D
-------Original Message-------=0D
=0D
From: Supra Club of NZ Mailing List=0D
Date: 05/18/04 19:33:04=0D
To: Supra Club of NZ Mailing List=0D
Subject: Re: [sconz] Speed CUT=0D
=0D
=0D
Yep, kind of.=0D
I run a HKS SCD on my JZA70 auto supra, which is pretty similar.=0D
Works a treat, after I adjusted it up ;)=0D
(not, of course, that I EVER go over 180! that would be BAD!!)=0D
=0D
Regards,=0D
Stuart W.=0D
=0D
---=0D
Supra Club of New Zealand=0D
http://www.supras.org.nz/=0D
=20
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<DIV> my (little)1g has no speed cut and a 330kph analogue speedo..<=
/DIV>
<DIV>does anyone know if this would be factory...its a 91 jap spec</DIV>
<DIV> </DIV>
<DIV id=3DIncrediOriginalMessage><I>-------Original Message-------</I></D=
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<DIV> </DIV>
<DIV id=3Dreceivestrings>
<DIV dir=3Dltr style=3D"FONT-SIZE: 11pt" <i><B>From:</B></I> <A href=3D"m=
ailto:sconz@list.supras.org.nz">Supra Club of NZ Mailing List</A></DIV>
<DIV dir=3Dltr style=3D"FONT-SIZE: 11pt" <i><B>Date:</B></I> 05/18/04 19:=
33:04</DIV>
<DIV dir=3Dltr style=3D"FONT-SIZE: 11pt" <i><B>To:</B></I> <A href=3D"mai=
lto:sconz@list.supras.org.nz">Supra Club of NZ Mailing List</A></DIV>
<DIV dir=3Dltr style=3D"FONT-SIZE: 11pt" <i><B>Subject:</B></I> Re: [scon=
z] Speed CUT</DIV></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>Yep, kind of.</DIV>
<DIV>I run a HKS SCD on my JZA70 auto supra, which is pretty similar.</DI=
V>
<DIV>Works a treat, after I adjusted it up ;)</DIV>
<DIV>(not, of course, that I EVER go over 180! that would be BAD!!)</DIV>
<DIV> </DIV>
<DIV>Regards,</DIV>
<DIV>Stuart W.</DIV>
<DIV> </DIV>
<DIV>---</DIV>
<DIV>Supra Club of New Zealand</DIV>
<DIV><A href=3D"http://www.supras.org.nz/">http://www.supras.org.nz/</A><=
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RE: Speed CUT

2004-05-18 19:53:00

RE: Speed CUT

2004-05-18 20:19:00

Stuart, how have you confirmed mapping to 17PSI?
The reason I ask is that fuel cut appears to be 15PSI on my JZ.

Regards,
Marc

-----Original Message-----
From: bounce-33755-25@list.supras.org.nz
[mailto:bounce-33755-25@list.supras.org.nz] On Behalf Of Stuart
Sent: Tuesday, 18 May 2004 7:43 p.m.
To: Supra Club of NZ Mailing List
Subject: Re: [sconz] Speed CUT

On Tue, 18 May 2004 17:43, David Gillard wrote:
> no probs I will get the HKS one I think.
sounds sensible.

> So what your saying is if they didn't upgrade my injectors the unichip

> is doing the same thing as a greddy BCC? cause I can run any PSI
> without cut or hesitation or smoke.
I would say it is acting as a mixture of a greddy BCC (which is a BAD
thing if
you ever go over 17-18PSI) and an Apexi AFC (which allows fuel mixture
trimming).

There is a good, if somewhat inaccurate, description of the functioning
of a
BCC here:
http://www.mkiv.com/techarticles/bcc/why_bcc/Why_the_GReddy_BCC.htm

I *think* the Mk.4 has fuel maps to 17PSI, but according to the above it
only
has them to 14PSI, hmmm. I know my JZA70 has them to 17PSI.
If the above is true then I would say 14psi is the most you should
safetly
run.

> I did ask them to check if the car was running lean at anytime up to
> 18PSI and they said no problems.

Running lean is not the problem, these cars MUST run very rich onb
boost, as
the extra fuel works to control detonation and to significantly lower
combustion temperatures, without the right amount of rich, you will blow

engines - this is part of the reason Mk.4 people have a tendency to melt

pistons and cook turbos, because they don't run rich enough.

> If I were to upgrade injectors would I have to go a different way
> about fuel cut? does the ECU somehow recognise you have upgraded??
> whats the go?

Yes, and No.
You need something to significantly re-tune the ECU to match the larger
injectors - the unichip may have enough range to do it.

basically, if your injectors are 20% larger, you can run 20% more boost
(that
is a simplification, but it's ballpark right).

Regards,
Stuart W.

---
Supra Club of New Zealand
http://www.supras.org.nz/

Re: Speed CUT

2004-05-18 20:33:00

On Tue, 18 May 2004 20:18, Marc Archbold wrote:
> Stuart, how have you confirmed mapping to 17PSI?
> The reason I ask is that fuel cut appears to be 15PSI on my JZ.

JZA70?
On the JZA80 it's from memory, and it could well be that I am wrong..

on the JZA70 I know cause I used to run 17PSI regularly, and with a couple of
different boost gauges, that seemed to give correct readings in a bunch of
other cars, so it would be a big surprise if it was wrong.

Of course, the thing I *don't* know is if the JZA70 uses a plain ole
exact-pressure cut, or if it uses some more complex form of cut, perhaps at a
certain injector duration, in which case it could vary with car.

Regards,
Stuart W.

RE: Speed CUT

2004-05-18 21:15:00

Will depend on atmospheric conditions, would it not? i.e. hot days psi will
be more verses less psi for same fuel cut on colder days. Also boost gauges
might not be accurate as each other......

-----Original Message-----
From: bounce-33759-72@list.supras.org.nz
[mailto:bounce-33759-72@list.supras.org.nz] On Behalf Of Marc Archbold
Sent: Tuesday, 18 May 2004 8:19 p.m.
To: Supra Club of NZ Mailing List
Subject: RE: [sconz] Speed CUT

Stuart, how have you confirmed mapping to 17PSI?
The reason I ask is that fuel cut appears to be 15PSI on my JZ.

Regards,
Marc

-----Original Message-----
From: bounce-33755-25@list.supras.org.nz
[mailto:bounce-33755-25@list.supras.org.nz] On Behalf Of Stuart
Sent: Tuesday, 18 May 2004 7:43 p.m.
To: Supra Club of NZ Mailing List
Subject: Re: [sconz] Speed CUT

On Tue, 18 May 2004 17:43, David Gillard wrote:
> no probs I will get the HKS one I think.
sounds sensible.

> So what your saying is if they didn't upgrade my injectors the unichip

> is doing the same thing as a greddy BCC? cause I can run any PSI
> without cut or hesitation or smoke.
I would say it is acting as a mixture of a greddy BCC (which is a BAD
thing if
you ever go over 17-18PSI) and an Apexi AFC (which allows fuel mixture
trimming).

There is a good, if somewhat inaccurate, description of the functioning
of a
BCC here:
http://www.mkiv.com/techarticles/bcc/why_bcc/Why_the_GReddy_BCC.htm

I *think* the Mk.4 has fuel maps to 17PSI, but according to the above it
only
has them to 14PSI, hmmm. I know my JZA70 has them to 17PSI.
If the above is true then I would say 14psi is the most you should
safetly
run.

> I did ask them to check if the car was running lean at anytime up to
> 18PSI and they said no problems.

Running lean is not the problem, these cars MUST run very rich onb
boost, as
the extra fuel works to control detonation and to significantly lower
combustion temperatures, without the right amount of rich, you will blow

engines - this is part of the reason Mk.4 people have a tendency to melt

pistons and cook turbos, because they don't run rich enough.

> If I were to upgrade injectors would I have to go a different way
> about fuel cut? does the ECU somehow recognise you have upgraded??
> whats the go?

Yes, and No.
You need something to significantly re-tune the ECU to match the larger
injectors - the unichip may have enough range to do it.

basically, if your injectors are 20% larger, you can run 20% more boost
(that
is a simplification, but it's ballpark right).

Regards,
Stuart W.

---
Supra Club of New Zealand
http://www.supras.org.nz/

---
Supra Club of New Zealand
http://www.supras.org.nz/

Re: Speed CUT

2004-05-18 21:22:00

On Tue, 18 May 2004 21:15, Hunt M wrote:
> Will depend on atmospheric conditions, would it not? i.e. hot days psi will
> be more verses less psi for same fuel cut on colder days. Also boost gauges
> might not be accurate as each other......

jza70 is MAP, not AFM, so they are possibly not as sensitive to conditions as
the AFM based 7M, but then again, it depends on how the ECU makes the
decision.
Toyota could still make temperature adjustments, amongst others.

Regards,
Stuart W.

Re: Speed CUT

2004-05-19 10:39:00

spot on the unichip has a speed cut feature but it only works on the 6
SPD manual not the auto

Marc Archbold wrote:

>Correct me if Im wrong - the Unichip does not disable speed cut or is it
>that the Unichip does have a speedcut feature but does not work with
>your vehicle?
>
>
>
>-----Original Message-----
>From: bounce-33750-25@list.supras.org.nz
>[mailto:bounce-33750-25@list.supras.org.nz] On Behalf Of David Gillard
>Sent: Tuesday, 18 May 2004 6:44 p.m.
>To: Supra Club of NZ Mailing List
>Subject: Re: RE: RE: [sconz] Speed CUT
>
>
>Well Technik Tuning in Thornbury are supposed to be MKIV and Toyota
>Specialists and they say its all good and safe as long as I don't boost
>over 17-18 PSI
>
>----- Original Message -----
>From: Hunt M <5uprah@supras.co.nz>
>Date: Tuesday, May 18, 2004 4:40 pm
>Subject: RE: RE: [sconz] Speed CUT
>
>
>
>>You could - obviously a safer way to go but you have to have
>>someone to test
>>these "work-arounds" too see if they are any good I guess.....
>>
>>-----Original Message-----
>>From: bounce-33747-72@list.supras.org.nz
>>[mailto:bounce-33747-72@list.supras.org.nz] On Behalf Of Marc Archbold
>>Sent: Tuesday, 18 May 2004 6:11 p.m.
>>To: Supra Club of NZ Mailing List
>>Subject: RE: RE: [sconz] Speed CUT
>>
>>
>>Well, you could buy a real aftermarket management system instead of
>>using work-arounds.
>>
>>
>>
>>-----Original Message-----
>>From: bounce-33745-25@list.supras.org.nz
>>[mailto:bounce-33745-25@list.supras.org.nz] On Behalf Of David Gillard
>>Sent: Tuesday, 18 May 2004 5:58 p.m.
>>To: Supra Club of NZ Mailing List
>>Subject: Re: RE: [sconz] Speed CUT
>>
>>
>>do I need this in conjunction with something else or it does
>>everything
>>required?
>>
>>----- Original Message -----
>>From: Marc Archbold <marc.a@paradise.net.nz>
>>Date: Tuesday, May 18, 2004 3:52 pm
>>Subject: RE: [sconz] Speed CUT
>>
>>
>>
>>>The SP2 autotrans speed signal must be defeated as well. The
>>>
>>>
>>Apexi
>>
>>
>>>rev/speed meter will do this.
>>>
>>>
>>>
>>>
>>---
>>Supra Club of New Zealand
>>http://www.supras.org.nz/
>>
>>
>>---
>>Supra Club of New Zealand
>>http://www.supras.org.nz/
>>
>>
>>
>
>
>---
>Supra Club of New Zealand
>http://www.supras.org.nz/
>
>
>---
>Supra Club of New Zealand
>http://www.supras.org.nz/
>
>

Re: Speed CUT

2004-05-19 10:41:00

ha ha of course not, me either....
I will order one today it was the only one I could find I guess thats
why it costs 270 AU

Stuart wrote:

>On Tue, 18 May 2004 18:16, David Gillard wrote:
>
>
>>I will eventually this is interim stuff till I get enough cash
>>has anyone used a SCD on an AUTO
>>
>>
>
>Yep, kind of.
>I run a HKS SCD on my JZA70 auto supra, which is pretty similar.
>Works a treat, after I adjusted it up ;)
>(not, of course, that I EVER go over 180! that would be BAD!!)
>
>Regards,
>Stuart W.
>
>---
>Supra Club of New Zealand
>http://www.supras.org.nz/
>
>

Re: Speed CUT

2004-05-19 10:41:00

yeah I see what you mean the only reason I did it is cause fuel cut was
coming in as low as 14.5 PSI pisssin me off bad

Stuart wrote:

>On Tue, 18 May 2004 18:43, David Gillard wrote:
>
>
>>Well Technik Tuning in Thornbury are supposed to be MKIV and Toyota
>>Specialists and they say its all good and safe as long as I don't boost
>>over 17-18 PSI
>>
>>
>
>sorry, been out doing stuff.
>Yes, 17ish PSI would be right, because that is the stock fuel cut anyway..
>Personally, I would prefer to still have my fuel cut, because then if I
>accidentally boost higher, the ECU protects the engine.
>Running over fuel cut, where there is no matching fuel or ignition curve, is
>just bad.
>
>Of course, you are no doing that, so good on you :)
>
>Regards,
>Stuart.
>
>---
>Supra Club of New Zealand
>http://www.supras.org.nz/
>
>

Re: Speed CUT

2004-05-19 10:42:00

nope unfortunately not, 180KMH is the limit

Hunt M wrote:

>180?? We must be talking MPH :)
>
>-----Original Message-----
>From: bounce-33753-72@list.supras.org.nz
>[mailto:bounce-33753-72@list.supras.org.nz] On Behalf Of Stuart
>Sent: Tuesday, 18 May 2004 7:33 p.m.
>To: Supra Club of NZ Mailing List
>Subject: Re: [sconz] Speed CUT
>
>On Tue, 18 May 2004 18:16, David Gillard wrote:
>
>
>>I will eventually this is interim stuff till I get enough cash
>>has anyone used a SCD on an AUTO
>>
>>
>
>Yep, kind of.
>I run a HKS SCD on my JZA70 auto supra, which is pretty similar.
>Works a treat, after I adjusted it up ;)
>(not, of course, that I EVER go over 180! that would be BAD!!)
>
>Regards,
>Stuart W.
>
>---
>Supra Club of New Zealand
>http://www.supras.org.nz/
>
>
>---
>Supra Club of New Zealand
>http://www.supras.org.nz/
>
>

Re: Speed CUT

2004-05-19 10:42:00

On Wed, 19 May 2004 10:37, David Gillard wrote: > spot on the unichip has a speed cut feature but it only works on the 6 > SPD manual not the auto Hmmm... it seems surprising that it would be that different. Are there different models of HKS SCD between manual and auto? I know I have an HKS SCD on my JZA70 Auto, so I know that they can work. Regards, Stuart W.

Re: Speed CUT

2004-05-19 10:43:00

excellent thanks alot for your info still blows a little black smoke
when I boost high so I feel pretty safe about it, just gotta make sure I
don't get excited and boost to high

Stuart wrote:

>On Tue, 18 May 2004 17:43, David Gillard wrote:
>
>
>>no probs I will get the HKS one I think.
>>
>>
>sounds sensible.
>
>
>
>>So what your saying is if they didn't upgrade my injectors the unichip
>>is doing the same thing as a greddy BCC?
>>cause I can run any PSI without cut or hesitation or smoke.
>>
>>
>I would say it is acting as a mixture of a greddy BCC (which is a BAD thing if
>you ever go over 17-18PSI) and an Apexi AFC (which allows fuel mixture
>trimming).
>
>There is a good, if somewhat inaccurate, description of the functioning of a
>BCC here:
>http://www.mkiv.com/techarticles/bcc/why_bcc/Why_the_GReddy_BCC.htm
>
>I *think* the Mk.4 has fuel maps to 17PSI, but according to the above it only
>has them to 14PSI, hmmm. I know my JZA70 has them to 17PSI.
>If the above is true then I would say 14psi is the most you should safetly
>run.
>
>
>
>>I did ask them to check if the car was running lean at anytime up to
>>18PSI and they said no problems.
>>
>>
>
>Running lean is not the problem, these cars MUST run very rich onb boost, as
>the extra fuel works to control detonation and to significantly lower
>combustion temperatures, without the right amount of rich, you will blow
>engines - this is part of the reason Mk.4 people have a tendency to melt
>pistons and cook turbos, because they don't run rich enough.
>
>
>
>>If I were to upgrade injectors would I have to go a different way about
>>fuel cut? does the ECU somehow recognise you have upgraded?? whats the
>>go?
>>
>>
>
>Yes, and No.
>You need something to significantly re-tune the ECU to match the larger
>injectors - the unichip may have enough range to do it.
>
>basically, if your injectors are 20% larger, you can run 20% more boost (that
>is a simplification, but it's ballpark right).
>
>Regards,
>Stuart W.
>
>---
>Supra Club of New Zealand
>http://www.supras.org.nz/
>
>

Re: Speed CUT

2004-05-19 10:45:00

yeah there is 3 types of HKS SCD one specifically for JZA80 2JZ-GTE Auto
for manual its a differnet type all together I thought it was a little
wierd too

Stuart wrote:

>On Wed, 19 May 2004 10:37, David Gillard wrote:
>
>
>>spot on the unichip has a speed cut feature but it only works on the 6
>>SPD manual not the auto
>>
>>
>
>Hmmm... it seems surprising that it would be that different. Are there
>different models of HKS SCD between manual and auto? I know I have an HKS SCD
>on my JZA70 Auto, so I know that they can work.
>
>Regards,
>Stuart W.
>
>---
>Supra Club of New Zealand
>http://www.supras.org.nz/
>
>

Re: Speed CUT

2004-05-19 13:03:00

Or you could try an Apexi Rev/speed meter which has SP2/Sp1 disable
and have the nice functions (350Km/hr speedo, 0-100 etc) that it provides.

> ha ha of course not, me either....
> I will order one today it was the only one I could find I guess thats
> why it costs 270 AU
>
> Stuart wrote:
>
> >On Tue, 18 May 2004 18:16, David Gillard wrote:
> >
> >
> >>I will eventually this is interim stuff till I get enough cash
> >>has anyone used a SCD on an AUTO
> >>
> >>
> >
> >Yep, kind of.
> >I run a HKS SCD on my JZA70 auto supra, which is pretty similar.
> >Works a treat, after I adjusted it up ;)
> >(not, of course, that I EVER go over 180! that would be BAD!!)
> >
> >Regards,
> >Stuart W.
> >
> >---
> >Supra Club of New Zealand
> >http://www.supras.org.nz/
> >
> >
>
>
> ---
> Supra Club of New Zealand
> http://www.supras.org.nz/
>

Re: Speed CUT

2004-05-19 13:05:00

Like the Soarers, the JZA80 Auto/ECUs use an SP2 from the trans that the
ECU will use for Speedcut. You must defeat both SP1 (The Vehicle speed
sensor that the Odometer and ECU uses) and SP2 (Speed sensor
located in Auto).

> On Wed, 19 May 2004 10:37, David Gillard wrote:
> > spot on the unichip has a speed cut feature but it only works on the
> 6
> > SPD manual not the auto
>
> Hmmm... it seems surprising that it would be that different. Are there
> different models of HKS SCD between manual and auto? I know I have
an
> HKS SCD
> on my JZA70 Auto, so I know that they can work.
>
> Regards,
> Stuart W.
>
> ---
> Supra Club of New Zealand
> http://www.supras.org.nz/
>

Re: Speed CUT

2004-05-19 13:18:00

Marc Archbold wrote:

>Or you could try an Apexi Rev/speed meter which has SP2/Sp1 disable
>and have the nice functions (350Km/hr speedo, 0-100 etc) that it provides.
>
>
>
>
>>ha ha of course not, me either....
>>I will order one today it was the only one I could find I guess thats
>>why it costs 270 AU
>>
>>Stuart wrote:
>>
>>
>>
>>>On Tue, 18 May 2004 18:16, David Gillard wrote:
>>>
>>>
>>>
>>>
>>>>I will eventually this is interim stuff till I get enough cash
>>>>has anyone used a SCD on an AUTO
>>>>
>>>>
>>>>
>>>>
>>>Yep, kind of.
>>>I run a HKS SCD on my JZA70 auto supra, which is pretty similar.
>>>Works a treat, after I adjusted it up ;)
>>>(not, of course, that I EVER go over 180! that would be BAD!!)
>>>
>>>Regards,
>>>Stuart W.
>>>
>>>---
>>>Supra Club of New Zealand
>>>http://www.supras.org.nz/
>>>
>>>
>>>
>>>
>>---
>>Supra Club of New Zealand
>>http://www.supras.org.nz/
>>
>>
>>
>
>
>---
>Supra Club of New Zealand
>http://www.supras.org.n
>
very interesting I may have to go for the Apexi, not sure how much they
are yet but shouldn't be to bad I guess, Has anyone got an Auto and
using something for speed cut????
What are you using Marc? or is your car Manual

RE: Speed CUT

2004-05-19 17:52:00

Yes there are different models.
The Soarer, Aristo and Supra JZA80 autos have a backup or SP2 signal
that must also be defeated. You can either modify a standard SLD to do
this or buy a unit such as the Apexi RSM that has SP2 interface.
SP1 is the odometer/ecu signal. SP2 is the Transmission speed sensor.

Cordially,
Marc

-----Original Message-----
From: bounce-33777-25@list.supras.org.nz
[mailto:bounce-33777-25@list.supras.org.nz] On Behalf Of Stuart
Sent: Wednesday, 19 May 2004 10:42 a.m.
To: Supra Club of NZ Mailing List
Subject: Re: [sconz] Speed CUT

On Wed, 19 May 2004 10:37, David Gillard wrote:
> spot on the unichip has a speed cut feature but it only works on the 6

> SPD manual not the auto

Hmmm... it seems surprising that it would be that different. Are there
different models of HKS SCD between manual and auto? I know I have an
HKS SCD
on my JZA70 Auto, so I know that they can work.

Regards,
Stuart W.

---
Supra Club of New Zealand
http://www.supras.org.nz/

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