Stock 25 Head

[The Bogan]

Was curious how much power can be made using the standard head and cams, reason being that im going to rebuild my motor so it will survive some higher boost and was wondering will the standard head flow good enough to see some good power readings with out dropping valves or other nasty things.

ie, a standard head is good for up to 280 atwkw

or, my head dropped all its valves into the pots and the world ended at 350 kw with a loud bang followed by some rattling until all was quite bar the trickling sound of coolant on the garage floor.

Thanks for any info guys and girls.

MLR

[R31Nismoid]

270rwkw/17psi (dyno Dynamics) GT30 (600hp) on PULP

370rwkw/24psi @ Autosalon (mainline dyno), GT30 (600hp) on Sunoco 104 and LOTS of extra timing

Everyone always said my set-up felt great when in the car. So i dont think i was lacking by having a stock head/cams at all.

Certainly was quick and did the numbers. Boost was on ~4000rpm @ both levels.

[The Bogan]

SWEET

[Guilt-Toy]

375rwkw with stock head n cams. rb25det head on 3 litre bottom end

[race_snooze]

one thing you might want to do is stronger valve spings, have seen them fail on high boost.

[dangerman4]

my stock springs have delt with 27 psi without issue

[The Bogan]

MMMM, RB 30 BOTTOM END, YOU GOT ME THINKING NOW.

[Guilt-Toy]

if you got a gsxr1100 the 3 litre bottom end is manditory

MMMM, RB 30 BOTTOM END, YOU GOT ME THINKING NOW.

[bubba]

+1 for twincam 30

My 25DE head made 365rwkw in its' previous life through standard intake manifold, standard throttlebody and standard cams.

[dano4127]

+1 for twincam 30

My 25DE head made 365rwkw in its' previous life through standard intake manifold, standard throttlebody and standard cams.

that is sick! I cant wait to get my cooler welded so i can retune the focker

Stock 25de head on 3ltr making 260kw at the moment, plan on getting it to the mid 300's

[bubba]

Yeah we figured the throttlebody was the limiting factor there, it just wouldn't make anymore power.. that was at 22psi through a pair of 2540's.

I'm going custom forward facing, q45 throttlebody and GT35R.. might chirp 2nd

[R31Nismoid]

^^ that would probably be the 2540's more than anything... such a nasty turbo

[dano4127]

Yeah we figured the throttlebody was the limiting factor there, it just wouldn't make anymore power.. that was at 22psi through a pair of 2540's.

I'm going custom forward facing, q45 throttlebody and GT35R.. might chirp 2nd

haha yeah thats pretty much what i have at the moment but stock tb, thinking of changing it to a custom billet one in the near future though...

In a 32 you wont even use second mate, I am frying 2nd in a R33 with fat stickies on the back @ 260!!! 3ltr torque FTMFW!

Edited August 29, 2008 by dano4127

[bubba]

^^ that would probably be the 2540's more than anything... such a nasty turbo

Nah same turbos are on the new motor (30 with a 25T head, greddy plenum, q45 t/b) and making 540awhp at 1.4bar (~20.6psi), so it was definately something on the intake side that was restricting it.

Dan, that's what I'm hoping for

Edited August 29, 2008 by bubba

[R31Nismoid]

did you do a boost test before/after cooler etc?

Just outta interest as its kinda off topic hehe