Guest rash rx7 Posted May 25, 2008 Share Posted May 25, 2008 Hello everyone! I'm helping out a friend with is MK4 Supra TT and we got a problem. The 1st turbo dosen't seem to boost anything decent. Only after the 4k rpms does the car start to boost like it should and pull hard. I've read on the FAQ the following: "Problem 4: I can't get any boost on the first turbo, it oscillates around a low boost pressure. A rare one this, your IACV is stuck open, and every time turbo #1 makes boost it takes pretty much the easiest way out - via the non-spinning 2nd turbo and back out to the air filter. It's like Problem 2 but happens all the time, not just at the transition point." My question is this: The car after the 4k rpm mark boosts good. Really seems like both turbos are working. Below that, boost is somewhat MIA.... We are going to buy a new IACV monday morning but I would like to know if anything else might cause this problem. Anything else we should check. Thanks, Quote Link to comment Share on other sites More sharing options...
Ian R Posted May 25, 2008 Share Posted May 25, 2008 How long has he owned the car is it set up in True Twin mode by any chance ?? Quote Link to comment Share on other sites More sharing options...
Guest rash rx7 Posted May 25, 2008 Share Posted May 25, 2008 How long has he owned the car is it set up in True Twin mode by any chance ?? he has the car for some years now but barelly anything has been done to it. It as some problems but nothing that affects mechanics.... What do you mean exacly by the car being set up in True Twin mode? I saw a link to a mod with that name, but I really do not belive the car is like that.... at least he certanly didn't do it! Don't know about the previouse owners... PS: That sounds like runing the Twins in non-sequencial. Is that right? Quote Link to comment Share on other sites More sharing options...
miko_supra Posted May 25, 2008 Share Posted May 25, 2008 he has the car for some years now but barelly anything has been done to it. It as some problems but nothing that affects mechanics.... What do you mean exacly by the car being set up in True Twin mode? I saw a link to a mod with that name, but I really do not belive the car is like that.... at least he certanly didn't do it! Don't know about the previouse owners... PS: That sounds like runing the Twins in non-sequencial. Is that right? Yes correct. Quote Link to comment Share on other sites More sharing options...
Ian R Posted May 25, 2008 Share Posted May 25, 2008 Yes mate search true twin conversion it will tell you how to set it up so I suppose you could trace it back and see whether it has been converted. Quote Link to comment Share on other sites More sharing options...
Guest rash rx7 Posted May 25, 2008 Share Posted May 25, 2008 nope. its not setup like that. just checked a guide on it. preaty sure its still sequencial Quote Link to comment Share on other sites More sharing options...
SupraTTBPU Posted August 12, 2008 Share Posted August 12, 2008 Have you solved the problem,.. i have the same !!?!?! 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.