Gt30 500 Hp Turbo With A/r .82 Exhaust Housing

[bigcarl]

im really interested to see if anyone is running a gt30 500hp turbo on their rb25 on these forums with an a/r.82 exhaust housing and if so what power are they getting in rwkws and at what boost pressure and rpm does it reach full boost by with what supporting mods??? cheers carl.

[R31Nismoid]

270-280 rwkw on pump fuel @ around 18-20 psi would be an educated guess from me

[bigcarl]

ive already got 281rwkws with a/r.63 exhaust housing, thanks for reply anyway.

[R31Nismoid]

in the 500hp the .63 really doesnt choke it, its when you get the slighty bigger comp wheel for the 550hp that the .63 would hold back.

i reckon the 550hp would come a damn sight close (if not make) 300rwkw on 20/22psi if in a .82 rear.

I went 270rwkw with 600hp on 17psi.

But then, when your talking 10/15kw thats a simple matter of dyno calibration really, your 280 could be 265 on the dyno i was on, or vice versa... if you see where im going with this

Its hard to compare 10/15/20kw differences IMO.

[N I B]

Missinglink has this turbo at 380rwhp@14psi, Ossie21 has 350rwhp@12 psi. Very early boost,One the best street RB25 Turbos.

Some SAU members have gone to 450rwhp on built engines.

[tx240]

yeah the .63 would probably be the better choice, gives better low end grunt. all the .82 would do is lag your combo out, unless you also go the bigger comp wheel as was stated earlier by R31Nismoid. all you really need to get more potential from your turbo is cam work, forget about a larger A/R turbine.

[RNS11Z]

i had this turbo,

1.8 bar = 420rwhp. Go figure, every dyno reads funny. then on 345rwhp i ran 120+mph.

this will confuse alot of figures

[bigcarl]

yeah a mixed bag of results thanx guys. i forgot to mention that my motor has been rebuilt is running 8.5 to 1 wiseco forged pistons and tomei poncams. 281rwkws in shootout mode.

[R31Nismoid]

any particular reason this questions comes up?

are you after more power or something dude?

[bigcarl]

yes im trying to find out if its worth it losing a bit low down for a bit more up top??? how many more rwkws it would give me ontop of 281?

[R31Nismoid]

bugger all if you ask me, maybe 20rwkw which you wont really feel.

i doubt id feel 280 going to 300, maybe @ 150rwkw going to 175 or something you would

i went 270 to 330, that i noticed

[bigcarl]

ahh the magical 300 at the wheels, not much too you maybe, hardly noticeable to me but doesnt it look good on a piece of paper lol !!!

[R31Nismoid]

Not really to be honest, i was damn happy with 270/17psi...

care drove as good as it was ever going to

For 330rwkw i used 104 octane, so not pulp hehee

[Robo's]

ahh the magical 300 at the wheels, not much too you maybe, hardly noticeable to me but doesnt it look good on a piece of paper lol !!!

<{POST_SNAPBACK}>

I can get you a dyno read out with 300rwkw if you want one

[PHaT MR30]

Surely going the bigger exhaust housing will make your car more drivable than it is now, and not make the power curve like a lightswitch.

[bigcarl]

wow , a few different answers there. does anyone know what the difference would be in rpm, what 300rpm , 500rpm? to spool up to full boost? i thought that posting here i might get some intelligent answers?? instead i get," i can get you a dyno print out for 300rwkws if you like". if i was just after outright power i wouldnt be playing around with such a small turbo would i? all im trying to do is discuss my options before going ahead or research before going ahead, i appreciate your help so far guys but weve come along way say since the sub zero workshop pulled 10.9 in a skyline over 5 years ago. they were using two of my turbos to pull 330rwkws . this was and is still impressive but now lots of peoples skylines are doing it and probably with less lag than is associated with two big twins. im just trying to see before i try to extract a little more. im a very happy with the way it drives at the moment and yes power does come hard at 3500/3800rpm. with boost starting at just over 2000rpm. has anybody actually driven or owned a skyline with a gt30 500hp rated turbo with a a/r.82 exhaust housing? because if it takes another 500rpm to spool the thing then know i probably would not bother but if its less than i would probably consider it.

Edited February 20, 2006 by bigcarl

[The Mafia]

ive already got 281rwkws with a/r.63 exhaust housing, thanks for reply anyway.

<{POST_SNAPBACK}>

I've got the same setup making 225rwkw... can you tell me your other mods?

(I'm running standard internals and 16psi boost)

[bigcarl]

low mount stainless manifold, ces split 3 inch dump pipe into a 4 inch magic cat, then 3 inch continueing to barrell style muffler with 4.5inch tip. 600x300x80mm front mount intercooler with stock plenum and pipeing. link ecu running 550cc injectors. splitfire coils. motor has been fully rebuilt with wiseco forged pistons on prepped gtr rods. running 8.5 to 1 comp. head mild port, running tomei poncams step ones 256inlet and exhaust, no adjustable cam gears. 600hp bosche fuel pump. i hope i havent left anything out.

[discopotato03]

Need turbos ID tag no's to identify it properly , 500Hp rating doesn't tell us much .

Cheers A .

[PHaT MR30]

Oh this sounds internally gated, i don't think they make a 0.82 AR housing internally gated for this turbo