Dash Rendar Posted March 18, 2006 Share Posted March 18, 2006 My run of bad luck doesn't seem to have ended yet. I put my foot down today, and the first turbo didn't seem to want to reach full boost. It reached about 0.5, and then started dropping. Then, #2 comes on and boosts all the way up to 1.4 bar!! How can it boost to 1.4 bar when it's got a 1.2 bar restrictor ring? This behaviour seems to be slightly intermittent, but it's worrying me. The car definitely seems more laggy. Help!! Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted March 18, 2006 Author Share Posted March 18, 2006 Could it be caused by badly connected boost pipe? Quote Link to comment Share on other sites More sharing options...
terribleturner Posted March 18, 2006 Share Posted March 18, 2006 First off i would double check the restrictor ring is there. Then maybe go round ALL hoses to check for splits. You don't have a boost controller Darren do you?? Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted March 18, 2006 Author Share Posted March 18, 2006 Is it possible for the restrictor ring to fall out? I was previously only boosting to 1.2 bar, so I can only assume that it was fitted as requested. Is it obvious to tell if it's there or not? I've had a look under the car and all I can see is the joins between exhaust components. No boost controller. Quote Link to comment Share on other sites More sharing options...
terribleturner Posted March 18, 2006 Share Posted March 18, 2006 Im just thinking that maybe someone has taken it out. There's no real obvious way. You'd have to undo the cat and see if it's there. Im not knowlegdable in the hybrid department but if the first turbo was failing would the 2nd one try to compensate and push more boost?? Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted March 18, 2006 Author Share Posted March 18, 2006 Undo the cat... But there is no cat?? Why would someone take it out??? Quote Link to comment Share on other sites More sharing options...
terribleturner Posted March 18, 2006 Share Posted March 18, 2006 Sorry, meant de-cat Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted March 18, 2006 Author Share Posted March 18, 2006 Okay, thanks James. Taking the exhaust off is not something I'm happy undertaking myself, so I'll be taking it to a professional. If it's not one thing, it's another. Can anything else possibly go wrong for me? Gonna take some pills now... Stinking migraine. Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted March 18, 2006 Author Share Posted March 18, 2006 Actually, I'm pretty sure the exhaust sounds quite a bit louder?? Interesting. Quote Link to comment Share on other sites More sharing options...
Homer Posted March 18, 2006 Share Posted March 18, 2006 As James already said, check for split hoses. It doesn't sound like a restrictor ring problem, your 1st turbo boost would not be affected by that going missing. If the first turbo is underboosting, then when 2nd comes online its overboosting it may well be a problem with one of the valves that controls boost to the 1st turbo (1st turbo is highly restricted making 2nd turbo overboost). Maybe the wastegate valve or Exhaust bypass valve... Hopefully someone with more knowledge of the turbo system will be along shortly. Edited to add - Jeez, you're not having much luck mate Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted March 19, 2006 Author Share Posted March 19, 2006 And I guess, if it was a sticky valve, that would explain why it doesn't happen every time. Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted March 19, 2006 Author Share Posted March 19, 2006 Are valve problems easy to diagnose / fix? Quote Link to comment Share on other sites More sharing options...
Ian C Posted March 19, 2006 Share Posted March 19, 2006 Check part 13 in the first and last pictures attached to this link. It's the feed from turbo #1 housing to the wastegate actuator. If it's split or leaking it could cause the bahviour you have described. -Ian Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted March 19, 2006 Author Share Posted March 19, 2006 Thanks Ian. I know roughly where the turbos are buried, so presumably getting to this feed is a bit tricky for a rank amateur like myself? The problem seems intermittent as it was boosting normally again today. I'll put this on my list of stuff to sort out! Until I get it sorted, will an occasional blast at 1.4 bar do any damage to my car? I'm currently running stage 1 hybrids. Quote Link to comment Share on other sites More sharing options...
Wez Posted March 19, 2006 Share Posted March 19, 2006 If you are running standard injectors and fuel pump with stock regulator at 1.4bar i would think you are lean which can be a problem. You should be able to see the restrictor ring by looking at the join between the cat bypass and downpipe or rear section, they are about 4mm thick and would look like a thick gasket. I would say you have a hose issue Quote Link to comment Share on other sites More sharing options...
paul mac Posted March 19, 2006 Share Posted March 19, 2006 was it a particularly cold day as mine peaked at just over 1.5 bar the other day in arctic air conditions, its usually rock solid at 1.4 bar on high boost, it gave higher boost with the controller off, low boost and high boost so right across the range Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted March 20, 2006 Author Share Posted March 20, 2006 It was rather cold, but not quite arctic. I guess that would account for a slight overboost, but to go from around 1.2 to 1.4 (actually, closer to 1.1 to 1.4 with my silencer in) and to see #1 underboosting is just all too much. I'm fairly convinced it's a hose or valve problem now... Not that I know anything!! Quote Link to comment Share on other sites More sharing options...
paul mac Posted March 20, 2006 Share Posted March 20, 2006 it might be worth trying when the weather has warmed up a bit, mine with the boost controller off would normaly give 0.8 bar in the cold that we have had recently its been closer 1 bar so is quite similar to the rise you were seeing Quote Link to comment Share on other sites More sharing options...
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