Jellybean Posted July 3, 2008 Share Posted July 3, 2008 Just quick Q when I turn off my boost controller she will boost to 2.0 Bar, she is BPU With boost controller turned on she boosts to desired setting 0.8 or 1.2 , any taughts Quote Link to comment Share on other sites More sharing options...
SteveR Posted July 3, 2008 Share Posted July 3, 2008 Have you got a restrictor ring in place? Quote Link to comment Share on other sites More sharing options...
Jellybean Posted July 3, 2008 Author Share Posted July 3, 2008 Have you got a restrictor ring in place? I dont know, she has one cat on her (closest to down pipes) and a SARD Mig Exhaust system with butterfly valve I think it might be a SARD Sport CAT Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 3, 2008 Share Posted July 3, 2008 In theory you have on and off the wrong way round, a working boost controller, bleeding air from the wastegate pressure pipe, cannot lower boost. An open wastegate pressure line could allow 2 bar boost. Something is very wrong there. Quote Link to comment Share on other sites More sharing options...
flyby Posted July 3, 2008 Share Posted July 3, 2008 I try a greddy boost controller. But when i want it to go as low as posible, it still rungs up to 1.4 bar and hit fuel cut. Iv set it up like the pic. What is it im missing here Quote Link to comment Share on other sites More sharing options...
Jellybean Posted July 3, 2008 Author Share Posted July 3, 2008 (edited) In theory you have on and off the wrong way round, a working boost controller, bleeding air from the wastegate pressure pipe, cannot lower boost. An open wastegate pressure line could allow 2 bar boost. Something is very wrong there. Thanks Chris, when I first got the car the boost controller was knackered so I fitted a AVCR one, but the car was boosting on old controller to 2.0 I have ever since been afraid to turn off the avcr and test but I just taught the ECU would of restricted it to factory 0.8 bar At 2.0 bar I never actually got fuel cut but it says on stock ECU Sard fiddled with it (stock injectors limit etc), i will try with new Boost controller turned off tomorrow, just 2.0 Bar put a hugh smile on my face Just as a note with new AVCR the car feels more contained (sounds stupid) but only way i can think of explaining i.e like a gas bottle with the lid back on you notice the pressure is there inturn she feels more responsive because u decide when to release the it Edited July 3, 2008 by Jellybean (see edit history) Quote Link to comment Share on other sites More sharing options...
supra steve Posted March 26, 2009 Share Posted March 26, 2009 did you ever get to the bottom of this?thats what mine is doing to.turn it off and it over boosts(thats with a restrictor ring in place which was giving me 1 bar before)the only difference is i cant get over the 1 bar.peaks to 1.05 bar then returns to 1 bar. Quote Link to comment Share on other sites More sharing options...
Jellybean Posted March 26, 2009 Author Share Posted March 26, 2009 did you ever get to the bottom of this?thats what mine is doing to.turn it off and it over boosts(thats with a restrictor ring in place which was giving me 1 bar before)the only difference is i cant get over the 1 bar.peaks to 1.05 bar then returns to 1 bar. When I got the car she had a very old greddy boost controller and the diaphram was knackered so she boosted to 2.0 bar Installed new Apexi Boost controller and she is at X bar of boost depending on what i set it to but when it is turned off she boosts to 1.0 bar due to the second cat is a high flow SARD cat, so she is mechanically restricted to 1.0 bar (no fancy electronics) Quote Link to comment Share on other sites More sharing options...
hadyn Posted March 26, 2009 Share Posted March 26, 2009 Suprised your engine and turbos lasted at 2 bar!!! Quote Link to comment Share on other sites More sharing options...
supra steve Posted March 26, 2009 Share Posted March 26, 2009 When I got the car she had a very old greddy boost controller and the diaphram was knackered so she boosted to 2.0 bar Installed new Apexi Boost controller and she is at X bar of boost depending on what i set it to but when it is turned off she boosts to 1.0 bar due to the second cat is a high flow SARD cat, so she is mechanically restricted to 1.0 bar (no fancy electronics) thanks for that,just leaving to go to the garage just now.hopefully get to the bottom of it. Quote Link to comment Share on other sites More sharing options...
Jellybean Posted March 26, 2009 Author Share Posted March 26, 2009 Suprised your engine and turbos lasted at 2 bar!!! To be honest, it scared the be-jaysus out of me so didnt boost her only 3 or 4 times (didnt have the nerve to keep the foot down), the new boost controller was fitted within a week and I wasnt too familar with Supras when I got it so I just got the new boost controller because the other wasnt working didnt think it was strange because I just taught Supras are suppose to be fast. I also read when u boost, it is suppose to hit u like a sledge hammer in the back Quote Link to comment Share on other sites More sharing options...
Ian C Posted March 26, 2009 Share Posted March 26, 2009 If you set the "internal/external" wastegate switch the wrong way, you'll get runaway boost like this. At such crazy boost levels on a big turbo the spark will blow out and it'll misfire heavily, saving the engine. On stockers I imagine they just heat the air up stupendously and would cause det if that boost level is maintained long enough to heat the combustions chambers, I.e. a few seconds. He guessed -Ian Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.