caseys Posted March 12, 2009 Share Posted March 12, 2009 (edited) I've noticed last night that I'm not getting the boost I was getting last week, and before I start pulling everything apart I'd like some opinions on what I should be looking for. Running a GT35R with Profec E-01 boost controller. Wastegate has (had?) a 0.8 bar spring. Boost controller set to OFF - should see 0.8bar - hitting 0.45 bar Boost controller set to LOW - should see 1.0bar - hitting 0.9 Boost controller set to HI - should see 1.2bar - hitting 0.9 I can't see any obvious leaks, but I haven't looked at all intercooler etc yet, I only noticed this last night on the way home. With the controller off and running on what should be the wastegate I'm definitely hearing the wastegate open at 0.45-0.5 bar, which makes me think it's the spring? Boost doesn't flutter or inconsistent in what it's actually getting to. I'm guessing as all settings are down that the boost controller can't hold the wastegate shut to the pressures set, so knackered? Maybe time for a new wastegate anyway, I'm unsure what make the one is that's on it from the prior owner. Any reasonable recommended brands to look for? Apologies if I sound like an idiot, this isn't my field of expertise! Edited March 12, 2009 by caseys (see edit history) Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted March 12, 2009 Share Posted March 12, 2009 If its a sudden drop, then i would be looking for a leak in either the pressure hoses or the vacuum lines. Link to comment Share on other sites More sharing options...
caseys Posted March 12, 2009 Author Share Posted March 12, 2009 It wasn't sudden, last week all was fine until I parked up, and then last night when I drove it I noticed. Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted March 12, 2009 Share Posted March 12, 2009 It wasn't sudden, last week all was fine until I parked up, and then last night when I drove it I noticed. Is that not sudden then:) Link to comment Share on other sites More sharing options...
Pig Posted March 12, 2009 Share Posted March 12, 2009 Sounds like its def. a boost leak. I have a problem where the car will not hold more than 1.35 bar on a 0.8bar spring so shouldnt imagine its that. Link to comment Share on other sites More sharing options...
caseys Posted March 12, 2009 Author Share Posted March 12, 2009 Is that not sudden then:) Apologies, I thought you meant sudden as in one second it was working fine, then suddenly it wasn't. I just mean that it occurred at a period either when it was sat in the drive cooling down, overnight, or before I hit full boost the next time I drove it. I would've thought with a boost leak that the boost pressure would fluctuate a bit? Oh well, going to test the system on Saturday then! Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted March 13, 2009 Share Posted March 13, 2009 Apologies, I thought you meant sudden as in one second it was working fine, then suddenly it wasn't. I just mean that it occurred at a period either when it was sat in the drive cooling down, overnight, or before I hit full boost the next time I drove it. I would've thought with a boost leak that the boost pressure would fluctuate a bit? Oh well, going to test the system on Saturday then! I guess it could be a sticky wastegate valve stem, IE gummed up with carbon. Link to comment Share on other sites More sharing options...
caseys Posted March 16, 2009 Author Share Posted March 16, 2009 Both of you gents were correct, t'was a boost leak. Also when up on the ramp found I have a small oil leak and the radiator has a split at the top. So new radiator and oil seals going on it this week! Was very confused when I bought the radiator new from Toyota (with a good discount). They want the old one back or it's a £50 surcharge?? I can understand if I was buying a refurb, but a spanking new one? I guess they send it off to re-core/refurb but why do I have to go to the inconvenience of giving them the old one back?? Link to comment Share on other sites More sharing options...
ShamelessTT Posted March 16, 2009 Share Posted March 16, 2009 It was the same when i bought mine, i sent my old one back got the refund so its worth doing.....i think they recycle them in some way. Link to comment Share on other sites More sharing options...
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