|Re: MKIII Speedo Converter - Speed Limiter?
|| 2001-08-02 16:14:00 <Marc Archbold [Marc.A@...>
|Supra Club of New Zealand - http://www.econz.co.nz/~supras|
> I know that the JZA70 2.5tt supra has 2 speed signals to the ECU, and my
> speed cut limit remover works fine just gateing one of them, so it should
> just be a matter of identifying which one..
Are they derived from the Speedo speed sensor, that is for the dash
speedometer? I have the diagrams for the ECU/ECT if anyone wants a look -
the more heads the better!
The other point I have noticed is that Toyota's speed signal wire to the ECU
is always pink! Nice colour :-b
> On Sun, 14 Nov 1999, Murray wrote:
> > Supra Club of New Zealand - http://www.econz.co.nz/~supras
> > Mark, was this tested in your soarer or a MkIII? The Soarer's have 4!!
> > take off's from previous experience. 2 are easy to find, but 2 are
> > apparently difficult to get rid of.
> > MMM
> > ----- Original Message -----
> > From: Marc Archbold <firstname.lastname@example.org>
> > To: <email@example.com>
> > Sent: Sunday, November 14, 1999 10:57 PM
> > Subject: Re: MKIII Speedo Converter - Speed Limiter?
> > > Supra Club of New Zealand - http://www.econz.co.nz/~supras
> > >
> > > Hi all,
> > > Built a working version of my speed cut lifter, its a 'gating' type in
> > which
> > > you set a preset speed threshold and when it is reached it switches to
> > > presentable *fixed* output.
> > > The frequencies: 0.71Hz per Km/hr, which is approx the same for my 92
> > Soarer
> > > as for the MkIII Supra. The only differences here is a +12v bias for
> > > Soarer, while the Mk3 Supra is +5v, which is pulled low by the speed
> > sensor.
> > >
> > > The Soarer is an automatic, as with all V8 Lexus SC400/Soarer.
> > >
> > > I set my threshold for ~170Km/hr with a 'fixed output' 170Km/hr.
> > on
> > > the bench it worked perfectly; an unmodified speed signal all the way
> > to
> > > the threshold, and then snap to the 'fixed' output with no change,
> > > went under the threshold.
> > > Using the factory wiring diagrams I connected it into the
> > > test drove it (eeck - on axle stands - of course ;-) unfortunately the
> > > &*^*@% speed cut still hit at 180Km/hr. I re-checked it all using a
> > > frequency counter and an oscilloscope.... the circuit delivered the
> > > frequency' at the threshold ok...but still speed cut. I then
> > the
> > > circuit at the entry of the speed sensor wires and sure enough the
> > > dash would read out the 'fixed frequency' at threshold, but you could
> > still
> > > feel the speed cut, at ~4000Rpm.
> > > Interestingly you could still feel the speed cut even with the speed
> > sensor
> > > wire disconnected....at ~4000. It looks like the speed sensor wire is
> > > the only 'source' for speed cut..... any feedback/ideas would be
> > > appreciated!
> > >
> > > The upside is that this should work perfectly in a MK3 manual!
> > >
> > > Frustrated,
> > > Marc A.
> > >
> > >
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