Scott Posted May 19, 2009 Share Posted May 19, 2009 Ok long story short my 2nd turbo popped so i had them both replaced. Since then i have been seeing strange boosting issues. I have checked all the technical articles and searched my arse off trying to find the answer but it seems i have a bit of a strange one. I have: Double De-cat 3" RSR II Exhaust 3"ish 1.2Bar Restrictor ring FMIC Mines ECU (FCD etc) Symptoms: 1st turbo starts making boost at the right time but only boosts to 0.5bar. The 2nd turbo doesn't come online until around 5krpm which is very late. When it does i am only seeing around 0.9bar. In TTC mode the boost doesn't hit till just under 5krpm and i also only get 0.9bar. I have checked the vac lines and replaced one that had a small crack in it. I have ran the car in TTC mode to check the pressure tank, pipes etc and it seems fine (both actuators stay open & holding pressure). Is it possible that i have a small leak? I'm thinking that if some of the pressure was lost, perhaps 0.5bar from the first turbo isn't enough to open up the EGBV and therefore the 2nd turbo isn't being pre-spooled making it come in late. Then when the 2nd turbo comes online the pressure is still down due to the small leak? I'm going to take off all the pipes and go over all the vac lines with a fine tooth comb. I'm also going to check all the intercooler pipes/couplers and make sure they are all tight. Any other ideas? Thanks Quote Link to comment Share on other sites More sharing options...
Rich Posted May 19, 2009 Share Posted May 19, 2009 Ok long story short my 2nd turbo popped so i had them both replaced. Since then i have been seeing strange boosting issues. I have checked all the technical articles and searched my arse off trying to find the answer but it seems i have a bit of a strange one. I have: Double De-cat 3" RSR II Exhaust 3"ish 1.2Bar Restrictor ring FMIC Mines ECU (FCD etc) Symptoms: 1st turbo starts making boost at the right time but only boosts to 0.5bar. The 2nd turbo doesn't come online until around 5krpm which is very late. When it does i am only seeing around 0.9bar. In TTC mode the boost doesn't hit till just under 5krpm and i also only get 0.9bar. I have checked the vac lines and replaced one that had a small crack in it. I have ran the car in TTC mode to check the pressure tank, pipes etc and it seems fine (both actuators stay open & holding pressure). Is it possible that i have a small leak? I'm thinking that if some of the pressure was lost, perhaps 0.5bar from the first turbo isn't enough to open up the EGBV and therefore the 2nd turbo isn't being pre-spooled making it come in late. Then when the 2nd turbo comes online the pressure is still down due to the small leak? I'm going to take off all the pipes and go over all the vac lines with a fine tooth comb. I'm also going to check all the intercooler pipes/couplers and make sure they are all tight. Any other ideas? Thanks Dundee on here had identical symptoms to you,turned out to be a tiny split on one of the vac hoses where it went onto one of the hard pipes. Quote Link to comment Share on other sites More sharing options...
Scott Posted May 19, 2009 Author Share Posted May 19, 2009 Dundee on here had identical symptoms to you,turned out to be a tiny split on one of the vac hoses where it went onto one of the hard pipes. Cheers mate, fingers crossed i can nail the sucker on friday then. Quote Link to comment Share on other sites More sharing options...
CarlT67 Posted May 19, 2009 Share Posted May 19, 2009 Have you checked the intercooler and pipes for leaks...? Quote Link to comment Share on other sites More sharing options...
jevansio Posted May 19, 2009 Share Posted May 19, 2009 Scott you ain't havig any luck with those twins, wish I could help, get a small single wacked on Quote Link to comment Share on other sites More sharing options...
Scott Posted May 19, 2009 Author Share Posted May 19, 2009 Scott you ain't havig any luck with those twins, wish I could help, get a small single wacked on You buying bud? I'm hoping that its just a small niggle, if so i'm happy, if not..... anyone wanna buy an almost working facelift black TT with fresh re-spray? lol Quote Link to comment Share on other sites More sharing options...
Scott Posted May 19, 2009 Author Share Posted May 19, 2009 Have you checked the intercooler and pipes for leaks...? Not extensively. I had a look over everything and i couldn't see anything out of the ordinary but i haven't pressure tested any of it. I want to be sure i'm looking for a leak though, no point in looking for a hooker in a monestary...... or is there Quote Link to comment Share on other sites More sharing options...
Jamesy W Posted May 19, 2009 Share Posted May 19, 2009 Be funny if I get boost before you Quote Link to comment Share on other sites More sharing options...
Scott Posted May 19, 2009 Author Share Posted May 19, 2009 Be funny if I get boost before you Yeah yeah yeah, i've got boost ya twat.... just not enough Quote Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted May 19, 2009 Share Posted May 19, 2009 Be funny if I get boost before you Not likely though is it?? Quote Link to comment Share on other sites More sharing options...
Jamesy W Posted May 19, 2009 Share Posted May 19, 2009 Not likely though is it?? Ask me that on Monday Quote Link to comment Share on other sites More sharing options...
DuaneT.Turbo Posted May 20, 2009 Share Posted May 20, 2009 Hey, I've only recently bought a twin turbo, my firstturbo dont come in till just over 3krpm @ 0.5 bar and second comes in at just over 5krpm and 1.2 bar, is this normal? Cheers Quote Link to comment Share on other sites More sharing options...
Scott Posted May 20, 2009 Author Share Posted May 20, 2009 Hey, I've only recently bought a twin turbo, my firstturbo dont come in till just over 3krpm @ 0.5 bar and second comes in at just over 5krpm and 1.2 bar, is this normal? Cheers Nope thats very wrong, sounds even worse than mine. Quote Link to comment Share on other sites More sharing options...
DuaneT.Turbo Posted May 20, 2009 Share Posted May 20, 2009 Yeah thats what i thought.. Maybe split hose? Do you know anyone near Derby that is decent with Supra's and can get it on a rolling road to setup and maybe Dyno? Quote Link to comment Share on other sites More sharing options...
Scott Posted May 20, 2009 Author Share Posted May 20, 2009 No idea mate, sorry. Quote Link to comment Share on other sites More sharing options...
DuaneT.Turbo Posted May 20, 2009 Share Posted May 20, 2009 No idea mate, sorry. No Worries, Cheers anyway. What was the problem with your Turbo's? Quote Link to comment Share on other sites More sharing options...
Scott Posted May 20, 2009 Author Share Posted May 20, 2009 No Worries, Cheers anyway. What was the problem with your Turbo's? Going to have a go at it on Friday. I've not had a proper look at it yet Quote Link to comment Share on other sites More sharing options...
Jamesy W Posted May 20, 2009 Share Posted May 20, 2009 You tried your other exhaust back on mate? Quote Link to comment Share on other sites More sharing options...
Scott Posted May 20, 2009 Author Share Posted May 20, 2009 You tried your other exhaust back on mate? Behave It was like that before the exhaust change. I just assumed the restrictor ring along with the exhaust was holding it back. Turns out it wasn't Quote Link to comment Share on other sites More sharing options...
Scott Posted May 26, 2009 Author Share Posted May 26, 2009 Ok i managed to get a little groundwork done today. 1 of the lines had a little tear in it and another one was too long so it had a bit much angle on it. I trimmed the long one and replaced the torn one. It appears that its running much much better but the reading on the boost gauge is still a little low. I've got the dump valve off for tomorrow, as thats my next test, and i'm planning to check out the boost gauge plumbing. The symptoms are now: 2000rpm 1st turbo starts to make boost, by around 2800rpm i'm making 0.6bar boost, by 3200rpm this tails off to 0.5bar boost. At 3800rpm the boost drops dramatically and then at 4000rpm the 2nd tubby hits hard at 1bar when all hell brakes loose. During the changeover i would say that it goes as low as 0.1-0.2bar. Does this sound reasonable if the boost gauge was under-reading? Quote Link to comment Share on other sites More sharing options...
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