Power Estimate

[ivosp]

Can anyone take a guess at how much horsepower this setup will make at the crank? I am almost finished building this.

Its a stock bottem rb20det with:

greddy e-manage

greddy profec e-01 (boost)controller

greddy fmic

hks gt2530 turbo

hks turbo elbow and 2,5inch exhaust

hks oil coolerkit

tomei camshafts 8.5mm 256 degrees

tomei adjustable cam gears

tomei head gasket 1.2mm

nissan ecu with chip for 444cc, gt3530, z32.

nissan z32 afm

nissan gtr 444cc injectors and walbro fuelpump

Jun-style front facing plenum (machined/ported), stock throttlebody

apexi airfilter

koyo radiator

My questions (a guess would be fine as answer):

What kind of boost would be safe on my setup? 1.5bar?

Is the 2,5inch exhaust a restriction? If so, of what kind?

What kind of power should I expect at the crank?

What will be a wise rev-limit to choose?

At what rpm will it make full boost?

What would be your next upgrade?

I thank anyone who takes the time to read and answer this very very much! Please excuse my poor English.

Edited December 6, 2007 by ivosp

[R31Nismoid]

Same as the other people... but a bit less due to the exhaust

i say 200rwkw

http://www.skylinesaustralia.com/forums/Rb...no-t103095.html

[ivosp]

I'm looking for about 240kw on the wheels. Is this possible with this turbo? What upgrades are needed? What kind of rev limit should i program?

What kind of power gains should be expexted from a 3inch exhaust instead of the 2,5inch? And what about changing camshafts to hks 9,1mm /264 deg. ?

Edited December 6, 2007 by ivosp

[murrayis]

I'm looking for about 240kw on the wheels. Is this possible with this turbo? What upgrades are needed? What kind of rev limit should i program?

What kind of power gains should be expexted from a 3inch exhaust instead of the 2,5inch? And what about changing camshafts to hks 9,1mm /264 deg. ?

Definetly go the 3inch exhaust, as the 2.5inch will become a restriction, Also 1.5bar is a lil high for a stock bottom end, maybe 1.2bar to be safe if you want it to last.

With a decent tune out of the emanage maybe 220kw but I would say around the 205 - 210 mark. As for the rev limit no higher than 7500rpm to be safe.

[limpus]

Nice setup you have...i'd say around the region of about 220-230rwkw at 1.2-1.3 bar as well...if everything is running well you might be able to get even more...i'd stick to about 1.3 bar anyway as any more you won't make much more power and just end up generating more heat...

Very interested to hear your results when you get them...cheers...

[R31Nismoid]

I'm looking for about 240kw on the wheels. Is this possible with this turbo? What upgrades are needed? What kind of rev limit should i program?

What kind of power gains should be expexted from a 3inch exhaust instead of the 2,5inch? And what about changing camshafts to hks 9,1mm /264 deg. ?

you wont make 240rwkw with a 2530.

you'll need something bigger, 2535 20+psi at least (bigger than the 2530)

Power gains with exhaust - enough.

You'll be able to run more timing everywhere due to less backpressure, so more response, more power.

[silva33]

My R33 with a HKS 2535 made 244rkw at 14psi tuned by Ben at Racepace with all the supporting mods and an untouched motor.

I agree with Ash and the 2530 not making 240rwkw, i have found with the 2530 and 2535 they will peak at a certain rwkw and then the more boost you put through them you gain massive midrange but not much up top.

They 2535 is a fantastic turbo for the RB25

[R31Nismoid]

He is RB20 dont forget

Needs a bit more boost to get him there

[silva33]

ah, I missed the RB20.. well then I agree with Ash 100%, I would even say that you would struggle to get 240rwkw with a 2535 RB20

[limpus]

^^^ Agreed...i'm putting out arounf 215-220rwkw on my rb20 with a 2535...might get abit more with cams perhaps but thats about it...

[ivosp]

Before this turbo, i had a hks gt2535. But it had the 0,84 a/r turbinehousing. I thought this would make it spool up to slow, so I sold it again. It would have probably be a nice combo with some high lift cams.

The cams/head gasket are the last bit I have to built. What if I swapped these poncams for procams with 10,25mm lift and 260 degrees duration? The only difference is that I then would have to spend about 500 euro extra on solid lifters and some good springs. The head has to go off anyway.

Or will it be an odd combo? I dont read much about these kind of camsetup in rb20's. Will it not work with a small turbo like the gt2530? Or would these 500 euro be better spend on a bigger turbo? I think nice cams do magic for the character of any engine.

I think if I go bigger on the turbo I will probably go for the greddy td06 (s or sh or l2?) or the hks gtrs. Internally wastegated. What would you prefer?

I want to reach this 240kw mark with as much responsiveness and fastspoolup as possible. Aside from a bigger exhaust, maybe a low mount cast iron hks manifold would be nice too. or wont this make much of a difference?

Thanks again for your help!

Edited December 7, 2007 by ivosp

[R31Nismoid]

Why are you so set on 240rwkw?

Its give and take. You cant have response if you want certain figures of power.

You'll have blistering response (well, remembering its RB20) with a 2530/2535

But much bigger (to get the 240-250rwkw) and your going to cost the performance.

A car with slightly less power but a turbo with a much better mid range will be much nicer to drive.

Its either that or you bite the bullet and get the Trust TD06 kit ($$, and well covered on this forum) and make ~250rwkw

[ivosp]

I want to stay on the safe side on stock internals and stock gearbox. I think that would be around the 240kw-250kw I guess. Bigger then gtrs/td06 would probably not be very wise with this stock parts.

Why is it that People rather go for big turbo's then a good camsetup? I suppose a 264degree/10,25 lift upgrade would do a lot for the responsiveness of the laggy rb20. I can problbly also work the head when it's off. That will probably also help me with some kw's. Or will the turbo just not flow anymore power?

Edited December 7, 2007 by ivosp

[dmac_25]

Hey Mate.

Im doing a build on my 20 going to try for 300rwkw in it going to use the same cams 256/8.5 but gonig with over size pistons so will be looking at a RB21 with a hypergear tr43hf with 023 fuel pump 555cc nismos but not sure on ecu looking at the emanage or going a gtr pfc

[ivosp]

Hi mate, nice plans! What is hypergear tr43hf? What does it cost?

[STATUS]

I'm looking for about 240kw on the wheels.

possible on sa dynos where are you located? i reckon about 220 genuine rwkw

[STATUS]

Hi mate, nice plans! What is hypergear tr43hf? What does it cost?

it is garbage

[Wheezy]

possible on sa dynos where are you located? i reckon about 220 genuine rwkw

...and 260rwkw on a WA Dyno

[ivosp]

Ontopic:

A friend of mine has a sr20det with HKS GTRS. Is is going to a bigger turbo and now selling his gtrs. Unfortunately this has a t25 flange. My question is: Can the gtrs turbine housing being swapped for my t3 gt2530 turbine housing? Or does this not fit? I came up this idea because it has exactly the same size:

gt2530r turbine:

Wheel- 76 Trim - 53.8 Major / 47.0 Exducer

GTRS:

Turbine wheel Trim 76Major diameter 53.8 (mm) Exit diameter 47.0(mm)

[Guilt-Toy]

I like statements like this. The pure fact that he didnt even say anything else about it because its probly soo crap its not worth the time and effort...

lol

it is garbage