Pulling 250rwkw+ from RB25DET!

[Guest INASNT]

about 10k will get u close to 300rwkw from totally stock rb25!

and jms are playing with fire with over 400rwkw on stock internals, DAMN!!

Steve

which head gasket have u been recommended?

[Steve]

HKS gaget. James from D1 Garage got it for me when he was in Japan. Asked one of his mates at signal which is best and he recommended HKS - so it should be ok:)

400+ probably is pushing it a bit, They were sprayin nos down the intake at the time, but I am quite confident if it can do a power run at that sort of power without detonation, 300 would be a walk in the park with the right setup.

[Cubes]

ahh so they were spraying nos.

Terry didn't tell me that. He said it had a little bit of work on the ports around the valves, big turbo with lots of timing and decent fuel.

He said it was on its limit but they had to win.

Tuned safe I think he said it made 380rwkw.

Terry seems to think 300-350rwkw is the absolute maximum safe you can run on stock internals. Obviously his/their RB was running on better fuel etc so that will give you a decent amount of head room.

Skyrine-Dave.....

I'm jamming open the wastegate and running a standard fuel pump until its well and truly run in.

[Guest INASNT]

Originally posted by Steve

HKS gaget.  James from D1 Garage got it for me when he was in Japan.  Asked one of his mates at signal which is best and he recommended HKS - so it should be ok:)

400+ probably is pushing it a bit,  They were sprayin nos down the intake at the time, but I am quite confident if it can do a power run at that sort of power without detonation, 300 would be a walk in the park with the right setup.

HKS 1.5 mm head gasket?

[Steve]

1.6mm actually, arrived today:)

[Guest INASNT]

nice!

might look into getting one 2!

from greenline?

[Steve]

No, James from D1 picked it up for me when he was in Japa

[Cubes]

So with forged pistons you shouldn't actually have to lower the compression ratio for it to be reliable?!?

I am aware that the Gibson R32 GTR was running better fuel, however that was running a 9.5:1CR with 30od + psi worth of boost.

[bodge]

My car has a FMIC, pod air filter, GTR fuel pump, HKS EVC boost controller runing 10 PSI, full exhaust with a dump pipe and gutted cat and it made 187RWKW. I have now purchased a HKS 3037 turbo, power FC, Z32 AFM and 740cc injectors. What RWKW figure am l looking at? l was hoping for around 220 to 230KW. Do you guys think this is achievable with this sort of setup? Also what is the maxium boost l can run without changing the head gasket?

[Steve]

Joel I think the idea of the head gasket is it makes a car less prone to detonation. It all comes down to the tune I suppose, but with 9:1 and stock pistons there is very little room for error ie bad fuel, changed weather etc.

I look at the gasket as a bit of a safeguard, like fitting forgies but a hell of alot less expensive. Merli has 280rwkw with stock engine and 1.2 bar of boost (from memory), so it is possible to make respectable power without forgies or head gasket.

bodge, the head gaskets on RB25 are pretty reliable, not sure what boost pressure you can run, but I havent heard of too many playing the weakest link in the RB25. the CR stock is 9:1, which will require very careful tuning to remain detonation free when you start winding in boost. How much boost is a question to be asking of the guy who is tuning it, ultimately that will be the deciding factor:) IMHO

With that turbo, I really dont think you will need much more than 1 bar to be making around 220rwkw. I have seen that sort of figure from an SR20 on 1 bar, the turbo was a 3037S 56T on highmount manifold and at 1.5 bar it was pumping out over 280rwkw. He also had cams and adj cam gears though.