Guest suprabass Posted August 25, 2008 Share Posted August 25, 2008 (edited) Ok Im getting a new turbo for my 1.5jz supra that ive been developing for the last few months, its currently running what Ive been told is a T04R Hks turbo making 536whp now Ive been givin the oppertunity to change the turbo. Thinking Gt38 with a .82AR housing or going to a Gt40 Bearing in mind the car is going to compete next year in the drift championships so needs to be very quick spooling and keep pulling all the way throught the revs. Edited August 25, 2008 by suprabass (see edit history) Quote Link to comment Share on other sites More sharing options...
RedM Posted August 25, 2008 Share Posted August 25, 2008 So you're basically asking which one to go for, right? Quote Link to comment Share on other sites More sharing options...
Nic Posted August 25, 2008 Share Posted August 25, 2008 Garrett GT35R, very fast spool up and good for around 540-550hp at 1.4bar Quote Link to comment Share on other sites More sharing options...
Guest suprabass Posted August 25, 2008 Share Posted August 25, 2008 (edited) basically im asking which turbo is going to give me the most power as quick and low down the rpm as possible right through to the Rev limit The Turbo thats on it made 536.3hp @ 4900rpm started spool at 1800rpm but started to drop off power and the torque started dropping after 4600rpm Edited August 25, 2008 by suprabass (see edit history) Quote Link to comment Share on other sites More sharing options...
b_have Posted August 25, 2008 Share Posted August 25, 2008 Sounds like it needs some cams and a better map.Thats a great figure at 4600 though. Quote Link to comment Share on other sites More sharing options...
Jake Posted August 25, 2008 Share Posted August 25, 2008 Ok Im getting a new turbo for my 2.5jz supra that ive been developing for the last few months, its currently running what Ive been told is a T04Z Hks turbo making 536whp now Ive been givin the oppertunity to change the turbo. Thinking Gt38 with a .82AR housing or going to a Gt40 What is a 2.5JZ then? You aren't realistically going to get 536whp from a GT40 let alone a GT38, certainly not at such low revs. Quote Link to comment Share on other sites More sharing options...
Guest suprabass Posted August 25, 2008 Share Posted August 25, 2008 car has hks 272 cams already in it and was mapped by greg at weston performance on a hks fcon gold , Miss typed its a 1.5 jz so 2jz 3ltr bottem end and a 1jz head. Quote Link to comment Share on other sites More sharing options...
Jake Posted August 25, 2008 Share Posted August 25, 2008 So it's making around 600 HP at just 4600rpm with 272 cams? Something isn't right here. Quote Link to comment Share on other sites More sharing options...
Guest suprabass Posted August 25, 2008 Share Posted August 25, 2008 Short spec that I was givin with the engine was ENGINE 2jz bottom with a 1jz top = 1.5jz inlet 264 exhaust 272 degrees HKS head gasket HKS pistons HKS T04R and ive corrected it after looking closer at the graph 536.3hp at 4900rpm on that spec, why is there something wrong? Quote Link to comment Share on other sites More sharing options...
Jake Posted August 25, 2008 Share Posted August 25, 2008 (edited) ive corrected it after looking closer at the graph 536.3hp at 4900rpm on that spec, why is there something wrong? The reason I said there's something wrong is/was because 536 RWHP (so around 600hp at the flywheel) at such low revs is almost unheard of. Then you said it has 272 cams too, which don't exactly promote early spooling either. Just doesn't make sense to me Also I was asking what you meant by 2.5JZ thinking that maybe you meant you had one of those 2500cc affairs, which would have made it even more unlikely. Any road, you've corrected some of those things now, so it's bit a more credible. TBH mate, I don't think you're going to do any better than you already have. If what you're saying is correct, you already have any amazing setup which would be very difficult to improve upon. Edited August 25, 2008 by Jake Grammar (see edit history) Quote Link to comment Share on other sites More sharing options...
Homer Posted August 25, 2008 Share Posted August 25, 2008 Something isn't right there. My money would be on a dodgy dyno readout. Quote Link to comment Share on other sites More sharing options...
Nic Posted August 26, 2008 Share Posted August 26, 2008 What boost are you running? Do you have a print out of the dyno graph? Quote Link to comment Share on other sites More sharing options...
Alex Posted August 26, 2008 Share Posted August 26, 2008 Ignoring the current dyno readings etc I'd agree that a Garrett GT35R would be the best step down from a T04Z. The GT4088R is too similar to the T04Z to be a worthwhile swap. Quote Link to comment Share on other sites More sharing options...
Guest suprabass Posted August 28, 2008 Share Posted August 28, 2008 Sorry been a bit late on the reply, Im on hols in spain at the minute, The car was mapped and dynoed at Weston Performance, so Im just going by the graph ive been givin. Now Ive been offered to have a turbo made up, all I want to know now is what Turbo should I go for with what housing to acheive 650-680 hp, what housing and what AR size. want it spooling up low down but holding its power a torque the whole way to the rev limiter. Quote Link to comment Share on other sites More sharing options...
Nic Posted August 28, 2008 Share Posted August 28, 2008 Now Ive been offered to have a turbo made up, all I want to know now is what Turbo should I go for with what housing to acheive 650-680 hp, what housing and what AR size. want it spooling up low down but holding its power a torque the whole way to the rev limiter. Why do you need such big power figures for drifting? Do you need more power than you're currently getting with the T04R? If you want more power there is always going to be a trade off with low down response. A T51 DBB turbo will get the power figures you're looking for, but is probably not going to be as responsive as the T04R you currently have. Ryan's site HERE is good for comparing different turbo setups. Quote Link to comment Share on other sites More sharing options...
Alex Posted August 28, 2008 Share Posted August 28, 2008 (edited) Personally I think you're after the moon on a stick with a 3L I6.... You're probably best off trying different (bigger) A/R exhaust housings on your current turbo... Edited August 28, 2008 by Alex (see edit history) Quote Link to comment Share on other sites More sharing options...
Nic Posted August 28, 2008 Share Posted August 28, 2008 (edited) Personally I think you're after the moon on a stick with a 3L I6.... You're probably best off trying different (bigger) A/R exhaust housings on your current turbo... If you're wanting 650-680hp and going to rag it on a drift track, you're also going to need some strong engine internals and good cooling to cope. Edited August 28, 2008 by Alex Updated my quote :) (see edit history) Quote Link to comment Share on other sites More sharing options...
Guest suprabass Posted August 29, 2008 Share Posted August 29, 2008 Ive been toying with the idea of changeing the Ar on the current turbo aswell, just trying to see if there are other options out there. The cooling isntg an issue as Ive spent time and money on this area as I had serious issues of 130+ oil temps, now running a huge main oil cooler with fans and its sitting at 105 when its running really on track, and having a second oil cooler system made up to take excess heat out but its still an idea on paper. water temps are now fine aswell as they were a problem but some thinking has sorted these,.. I know what you are all saying is rite I cant have the best of both worlds low down power and high end power, car will mainly be at the high end of the revs but its nice to be ablle to have that low down pull to the firrst corner. Thanks everyone who has put there points accross so far- Quote Link to comment Share on other sites More sharing options...
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