Suprachargedtt Posted February 16, 2005 Share Posted February 16, 2005 I have been experiencing some problems but not sure if anyone can put any light on the matter? When boosting on turbo 1 the boost gauge reads upto anythin between 8-15psi depending how much i put my foot down but, it doesnt seem to feel torquy at all, when turbo 2 kicks in at approx 4000rpm the car seems to fly and feels as it should. My question is, ive just had an engine rebuild for which the engine is now run in, i have a problem with one of the turbo seals as when i boost it smokes during and after. Before the rebuild you could really feel turbo 1 kick in and now you dont even notice (but i could never feel turbo 2 properly) is this set up properly? or could this be due to say turbo 1 seal has gone and is effecting the performance? I must stress tho the my boost gauge is registering the boost but i cant feel it! since i went hybrid with them they are reaching the boost and speed id expect but dont feel as torquy as the original turbos!?!? this cant be normal can it? Any ideas? i want to take this up with the tunning place but they will just say its normal. any ideas opinions would be great. Cheers James Link to comment Share on other sites More sharing options...
Suprachargedtt Posted February 17, 2005 Author Share Posted February 17, 2005 Anyone?? Link to comment Share on other sites More sharing options...
Ian C Posted February 17, 2005 Share Posted February 17, 2005 Hmmm. You may be leaking boost, running too much fuel and robbing power, or even the power delivery is different so it 'feels' slower when in fact it's the same or better... 15psi is too much for the first turbo IMO, 11-12psi max I'd say. -Ian Link to comment Share on other sites More sharing options...
Nic Posted February 17, 2005 Share Posted February 17, 2005 You say you had hybrids fitted, did you have ceramic j-spec turbos on before? Could it just be the slower spooling of the steel hybrids? There must be others who have fitted hybrids who could advise on the difference in power delivery. Link to comment Share on other sites More sharing options...
Suprachargedtt Posted February 17, 2005 Author Share Posted February 17, 2005 yes they were ceramic before but i went hybrid to be better, faster, and more torquey surley it wouldnt make it worse?? if it is i want my ceramics back! ian - i thought it might be leaking boost but i didnt know if this was possible? as i said before, the gauges are reading a boost just you cant feel it on turbo 1, would it be leaking from after the the gauge fittings? Link to comment Share on other sites More sharing options...
Nic Posted February 17, 2005 Share Posted February 17, 2005 yes they were ceramic before but i went hybrid to be better, faster, and more torquey surley it wouldnt make it worse?? if it is i want my ceramics back! I don't have any personal experience of driving a Supra with hybrid turbos, but was thinking this may be a cause of the difference in the power delivery that you describe. The hybrids will have heavier/bigger steel internals compared to the smaller/lighter ceramic internals of the J-Spec turbos, which will result in slower spool up lower down but bigger kick further up the rev range. Do you know what stage hybrids you got? As I say I'm just theorising, best get personal view from someone who has made the change, Ian?? Link to comment Share on other sites More sharing options...
Ian C Posted February 17, 2005 Share Posted February 17, 2005 Bizarrely I went from hybrids to stockers, due to an engine blowup early on in my Supra owning career, but the hybrids couldn't go back on fast enough Stockers definitely spin up faster, you can feel the inertia of the hybrids, #1 power delivery was roughly the same then, but when the second one came online, ye gods. You wouldn't go back You won't get more power and less spool time, though, it's a tradeoff. You could dyno it and see what power you get off #1 and compare it to the myriad of dyno charts floating around, *and* they can check your fuelling while they do it... It's prob not a boost leak as the gauge reads the pressure of what's entering the manifold, so if it shows 1.2bar then your engine is getting 1.2bar. I still can't believe you are hitting that on #1. Can you give us more details, like say in 3rd gear WOT let us know: What rpm #1 gives positive pressure What rpm #1 gives it's peak boost and what pressure that is What rpm the boost drops off and what it settles out at If you hit WOT above 4000rpm does it behave differently to climbing up to 4000+rpm at WOT Tricky while driving but really helpful for remote diagnosis -Ian Link to comment Share on other sites More sharing options...
Suprachargedtt Posted February 18, 2005 Author Share Posted February 18, 2005 Ian c - ill try and get all the info for you cheers, Dyno is a great idea, ill look into that. Nic - they are stage 3 hybrids, If it helps my other mods are:- i have no cats! 3" straight through stainless exhaust, twin induction kit, Custon FMIC, TRL FCD, Turbosmart E-boost controller.Its going in to get checked in couple of weeks so hopefully will have some new light on this situation. James Link to comment Share on other sites More sharing options...
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