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Gt28rs On Rb25

adam87

By adam87,
in Engines & Forced Induction

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adam87 Community Regular

adam87

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Posted

hi

i have a CA silvia. currently it has a GT28rs with .64 exhaust. i have pulled the CA out and am putting an rb25 in currently.

my questions is, is the gt28rs too small for the rb25?

im aiming between 300 & 350hp. ill have to get an adapter to go from t2 to t3 flange but thats no big deal.

opinions please.

thanks

adam

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limpus Mentor

limpus

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Posted (edited)

The gt28rs is similar to a hks 2530 which some guys have on their rb25s...its is rather small but it will give more power over the stock rb25 turbo and hold up at more than 14psi without spitting the exhaust wheel out...the .64 exhaust housing would be restrictive for a 25 though...in terms over power i'd expect somewhere in the low 200rwkw range with blistering response...

Edited by limpus
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adam87 Community Regular

adam87

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read though the dyno results!! for rb25's

i have. but couldnt really see a gt28rs being used anywhere.

i already have this turbo so was trying to get a gauge on where it will take me

will putting more boost through be likely to increase power? or maybe not do anything else because of the .64 exhaust?

so 14psi would see me at 280hp but 18psi may only see me at 285hp and hotter running temps?

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