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2.0 GT Turbo proplems   2002-01-30 14:00:00 <Tiger Tim> Hi all, this was posted today on the UK Supra list, and I wondered if any of you could answer, I`ll pass on any replies. Thanks. can anyone help me? i own a 1990 2.0 gt tt (import)supra im having problems with loss of power,the turbos and the wastegates are fine,they are producing plenty of boost. the problem seems to be when accelerating,sometimes when the turbos kick in the power drops as if something was reducing the air flow to the cylinders,sometimes juddering occurs too as if the throttle was been open and closed slightly causing a juddering effect, i also have a dump valve on and it seems to be working fine and it seems to dump plenty of air between gear changes. could it be a fuel problem? do these models have a fuel filter,i can`t find one in the engine bay, there was once or twice when i was accelerating once that the car suddenly started to accelerate a lot quicker as if there could have been a bad connection on a wire somewhere..... can anyone help,has anyone experienced this problem with their supra? Cheers Tiger Tim http://www.tigersport.co.uk 1991 Toyota Supra 2.5 TT-R (html version)

Re: 2.0 GT Turbo proplems   2002-01-30 14:31:00 <Tony Reeves> Does this 1G-GTE have an AFM? If so, and if the "dump valve" is dumping to atmosphere then that could be the problem. Regards Tony > Hi all, this was posted today on the UK Supra list, and I wondered if > any of you could answer, I`ll pass on any replies. Thanks. > > can anyone help me? > i own a 1990 2.0 gt tt (import)supra > im having problems with loss of power,the turbos and the wastegates are > fine,they are producing plenty of boost. > the problem seems to be when accelerating,sometimes when the turbos kick > in > the power drops as if something was reducing the air flow to the > cylinders,sometimes juddering occurs too as if the throttle was been > open and > closed slightly causing a juddering effect, > i also have a dump valve on and it seems to be working fine and it seems > to > dump plenty of air between gear changes. > could it be a fuel problem? > do these models have a fuel filter,i can`t find one in the engine bay, > there was once or twice when i was accelerating once that the car > suddenly > started to accelerate a lot quicker as if there could have been a bad > connection on a wire somewhere..... > can anyone help,has anyone experienced this problem with their supra? > > Cheers > > Tiger Tim > http://www.tigersport.co.uk > > 1991 Toyota Supra 2.5 TT-R > > > > --- > Supra Club of New Zealand > http://www.supras.org.nz/ >

Re: 2.0 GT Turbo proplems   2002-01-30 14:43:00 <Rob Ferguson> Could well be. My 2.0GT/TT has a Gp "A" twin piston atmo valve, and a flap AFM, yet shows no ill effects (including mixture surges on dumping). A Ford-driving friend with an AFM and atmo valve has trouble even getting his car to idle correctly! I'd guess the description of the dump valve in Tim's mail indicates an atmo valve, as a recirculating unit would be near-silent? Fester 88 GT/TT@17psi -----Original Message----- From: Tony Reeves <tony@tonyr.com> To: Supra Club of NZ Mailing List <sconz@supras.org.nz> Date: 30 January 2002 01:34 Subject: [sconz] Re: 2.0 GT Turbo proplems >Does this 1G-GTE have an AFM? If so, and if the "dump valve" is dumping to >atmosphere then that could be the problem. > >Regards > >Tony > >> Hi all, this was posted today on the UK Supra list, and I wondered if >> any of you could answer, I`ll pass on any replies. Thanks. >> >> can anyone help me? >> i own a 1990 2.0 gt tt (import)supra >> im having problems with loss of power,the turbos and the wastegates are >> fine,they are producing plenty of boost. >> the problem seems to be when accelerating,sometimes when the turbos kick >> in >> the power drops as if something was reducing the air flow to the >> cylinders,sometimes juddering occurs too as if the throttle was been >> open and >> closed slightly causing a juddering effect, >> i also have a dump valve on and it seems to be working fine and it seems >> to >> dump plenty of air between gear changes. >> could it be a fuel problem? >> do these models have a fuel filter,i can`t find one in the engine bay, >> there was once or twice when i was accelerating once that the car >> suddenly >> started to accelerate a lot quicker as if there could have been a bad >> connection on a wire somewhere..... >> can anyone help,has anyone experienced this problem with their supra? >> >> Cheers >> >> Tiger Tim >> http://www.tigersport.co.uk >> >> 1991 Toyota Supra 2.5 TT-R >> >> >> >> --- >> Supra Club of New Zealand >> http://www.supras.org.nz/ >> > > > > >--- >Supra Club of New Zealand >http://www.supras.org.nz/ >

Re:Re: 2.0 GT Turbo proplems   2002-01-30 15:18:00 <Steve M> hey tony how have you got your supra to run at 17 psi i am after some mod tips while the engine is out of the car. lol. dam warped head. need another one so part people do you still have that one for $600 if this other thing does not work i will talk to you. steve _____________________________________________ Free email with personality! Over 200 domains! http://www.MyOwnEmail.com

Re: 2.0 GT Turbo proplems   2002-01-30 16:19:00 <Stuart Woolford> On Wed, 30 Jan 2002, Rob Ferguson wrote: > Could well be. My 2.0GT/TT has a Gp "A" twin piston atmo valve, and a flap > AFM, yet shows no ill effects (including mixture surges on dumping). A > Ford-driving friend with an AFM and atmo valve has trouble even getting his > car to idle correctly! > > I'd guess the description of the dump valve in Tim's mail indicates an atmo > valve, as a recirculating unit would be near-silent? Recirculating systems are not nescessarily silent, my stock JZA70 makes some pretty loud noises from the large stock BOV, after venting back through the air filter, etc. Stuart W.

Re:Re: 2.0 GT Turbo proplems   2002-01-30 22:01:00 <Rob Ferguson> I fitted my TT with solenoid valves bypassing the wastegates until a preset level, and modified fuel cut and overboost thresholds. Suspect the fuel system may have been modded by the original Japanese owner. Possibly hybrid turbos too, though they're still ceramic. UK turbo specialists reckon they're running pretty well at the limit for reliable CT12s Sorry I can't give more info than this, at least until I pull them to bits to compare with standard... Rob -----Original Message----- From: Steve M <student@phayze.com> To: Supra Club of NZ Mailing List <sconz@supras.org.nz> Date: 30 January 2002 02:20 Subject: [sconz] Re:Re: 2.0 GT Turbo proplems >hey tony how have you got your supra to run at 17 psi i am after some mod >tips while the engine is out of the car. lol. dam warped head. need >another one so part people do you still have that one for $600 if this >other thing does not work i will talk to you. > >steve > >_____________________________________________ >Free email with personality! Over 200 domains! >http://www.MyOwnEmail.com > > >--- >Supra Club of New Zealand >http://www.supras.org.nz/ >

Re:Re: 2.0 GT Turbo proplems   2002-01-30 22:32:00 <Stuart W> On Wed, 30 Jan 2002 22:04, you wrote: > I fitted my TT with solenoid valves bypassing the wastegates until a preset > level, and modified fuel cut and overboost thresholds. > Suspect the fuel system may have been modded by the original Japanese > owner. Possibly hybrid turbos too, though they're still ceramic. > UK turbo specialists reckon they're running pretty well at the limit for > reliable CT12s > > Sorry I can't give more info than this, at least until I pull them to bits > to compare with standard... > > Rob The 1GGTE engines, like the 1JZ and 2JZ, will run 17PSI on the stock fueling computer without fuel cut (remember, they run 12PSI stock), the 7M, with it's 7PSI stock, fuel cuts at (around) 12PSI. Regards, Stuart.

Re:Re: 2.0 GT Turbo proplems   2002-01-30 22:58:00 <Rob Ferguson> Ah... that explains why my FCD only had to be dialed in at such a low setting!! :-) Thanx Stuart. -----Original Message----- From: Stuart W <stuartw@kcbbs.gen.nz> To: Supra Club of NZ Mailing List <sconz@supras.org.nz> Date: 30 January 2002 09:34 Subject: [sconz] Re:Re: 2.0 GT Turbo proplems >On Wed, 30 Jan 2002 22:04, you wrote: >> I fitted my TT with solenoid valves bypassing the wastegates until a preset >> level, and modified fuel cut and overboost thresholds. >> Suspect the fuel system may have been modded by the original Japanese >> owner. Possibly hybrid turbos too, though they're still ceramic. >> UK turbo specialists reckon they're running pretty well at the limit for >> reliable CT12s >> >> Sorry I can't give more info than this, at least until I pull them to bits >> to compare with standard... >> >> Rob > >The 1GGTE engines, like the 1JZ and 2JZ, will run 17PSI on the stock fueling >computer without fuel cut (remember, they run 12PSI stock), the 7M, with it's >7PSI stock, fuel cuts at (around) 12PSI. > >Regards, >Stuart. > > >--- >Supra Club of New Zealand >http://www.supras.org.nz/ >

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