Hks Gt Pro S Exhaust Housings On Rb20/25 ?

[discopotato03]

Hi all , as usual trying to make things easy if I can ...

For all you people who have HKS's GT2835 Pro S or GT3037 Pro S , I need to know a couple of things about clearance between the compressor housing and the std RB20/25 exhaust manifold . From specs I have both these turbos use TO4E .50 A/R compressor housings and I'd like to think they clear the std manifold by a reasonable margin .

I have always liked HKS's turbine housings because they are biased a bit more towards performance that Garrett's offerings ie the volute passage and nozzle is a better shape . There is a chance that using a real GT3076R (the one that looks like a GT3037S but without the trumpet mouth inlet insert) with Garretts IW GT30 housing that the comp housing may be where the exhaust manifold lives . I'm wondering how I would go with the Pro S turbine housing on this GT3076R 52 trim turbo thats in the wings next year . If I can luck out with a better housing design and clear the manifold it makes life easy .

Just on the Pro S housings , the waste gate vent path looks like it had some serious thought put into it (flat valve not small either) and the dump pipe should not be difficult to re create if its expensive/impossible to get .

Another thought was trying this combination out on HKS's cast low mount exhaust manifold though I have a feeling that the engine mount may get in the way .

Thoughts - particularly from that fella with the 3037 Pro S on the RB25 .

Cheers Adrian .

[gtst25]

Hi all , as usual trying to make things easy if I can ...

For all you people who have HKS's GT2835 Pro S or GT3037 Pro S , I need to know a couple of things about clearance between the compressor housing and the std RB20/25 exhaust manifold . From specs I have both these turbos use TO4E .50 A/R compressor housings and I'd like to think they clear the std manifold by a reasonable margin .

I have always liked HKS's turbine housings because they are biased a bit more towards performance that Garrett's offerings ie the volute passage and nozzle is a better shape . There is a chance that using a real GT3076R (the one that looks like a GT3037S but without the trumpet mouth inlet insert) with Garretts IW GT30 housing that the comp housing may be where the exhaust manifold lives . I'm wondering how I would go with the Pro S turbine housing on this GT3076R 52 trim turbo thats in the wings next year . If I can luck out with a better housing design and clear the manifold it makes life easy .

Just on the Pro S housings , the waste gate vent path looks like it had some serious thought put into it (flat valve not small either) and the dump pipe should not be difficult to re create if its expensive/impossible to get .

Another thought was trying this combination out on HKS's cast low mount exhaust manifold though I have a feeling that the engine mount may get in the way .

Thoughts - particularly from that fella with the 3037 Pro S on the RB25 .

Cheers Adrian .

http://www.skylinesaustralia.com/forums/in...st&id=12339

http://www.skylinesaustralia.com/forums/in...st&id=12340

Not the best pictures but from what I can remember the 2835 comp housing was pretty close to the manifold - I could get my dad to measure for you if you want.

[Devils_Advocate21]

Th compressor housing clearance of the 3037 pro S with the 56T and also .68 rear clears the manifold with ease, i am still able to mount the factory exhaust heat sheild on there as well on the manifold, no clearance problems at all, only fun is just jiggling around to get the perfect fit (as in jiggling the housings and turning them to properly fit it. but no clearance problems what so ever, as well as the INTWASTE well the actuator just needs some modifying to fit and hold properly, Have no fotos at the moment as am away from normal computer, but if your happy to wait i can get them off to you when i get back, hope that helps.

As well as dump/front pipe fabrication, most good exhaust shops should be able to custom one as the funny 5 bolt flange on them. so far so good.

Hope that helps out disco, as for proper measure of housing to manifold heat shield space ummm a good centermeter id say but would have to measure

Cheers

Adam

[discopotato03]

Thanks fellas , I guess its a case of a trial fit in the end . I remember asking ages ago for pics of the 3037 Pro S exhausting because the turbine size difference (compared to 2835 version) would not have worked . From the pics I'd say the people who machined these housings off set the turbo slightly and it shows when you compare the two turbine outlets in relation to the sealing groove .

Adam how do you find the power characteristics of that 3037 56T with the .68 A/R housing ? Depending on how much off boost urge I can find I was thinking of using the .87 .

Cheers Adrian .

[Devils_Advocate21]

I find the power characteristics as follows, due to that my engine has been fresh rebuilt so im still running on a lighted tune of 244 rwkw's until i am able to dyno after the first couple of thousand km's. In comparision as am unable to take past 3.5 K rpm for first thousand can only really report on findings so far, I have found that with the .68 housing that the boost will start making from about 2600 rpm, there is plenty of torque with the new turbo and i cannot really post much else until i am able to open it out further.

Although i will keep you guys updated when i do with dyno graph and also will update further on power characteristics when this happens,

But in the mean time, AAA+++ in my books, also on another note the .68 housing wasnt a by choice option, although my opinion i would have gone the .87 housing as well, or .82, but as im not chasing too larger numbers at the moment i have settled with the .68 housing

Hope that helps

Cheers Adam

[pavel]

Few pics of mine. HKS3037 PRO S with .64 exhaust housing mounted on standard RB25DET exhaust manifold.