petroi77

i was wondering how much WHP could i get with this setup

civic 1995 4 door
b16a swap.
2 1/2 inch exhaust system.
garrett t28 turbine and ar52 compressor, external westgate set at 1 bar.
OMNI 3 bar B series map sensor.
AEM fuel rail and regilator.
1000cc precision injectors.
Skunk2 66mm Alpha Throttle Body.
BLOX POWER INTAKE MANIFOLD up to 72mm.
Golden Eagle Cam Gear Gears.
Wiseco Forged Pistons Eagle Rods 10.75:1 81mm.
Darton sleave with fling
b18c type R camshafts and lifters.
ARP main and head studs.
AEM UEGO Wideband O2 Air/Fuel Ratio Gauge and the Bosch 4.2LSU sensor.
cometic std size and bore head gasket.
ACL Race BEARINGS Kit.
Vtec Gates Racing Belt Timing Kit.
5 bar fuel pump.
ptp turbo blanket
Mishimoto radiator and aluminum fan and shroud kit
hondata s300 v2
toda stage 3 clutch, disc and flywheel
MFactory racing axles

also id like some advice as to if theres anything i should add to the list

wantboost

iTrader: (2)

Maybe 260, maybe.

that's a small t28 and that's gonna be the bottle neck, everything about your setup is fairly overkill for sub 300hp though.

petroi77

i got 277whp on the dyno but with the rb20 t25 turbo at 0.8 bars and i was losing compression from number 4 piston at the time, when i overhauled i found that my crack was down as well

wantboost

iTrader: (2)

That's all you're gonna get from a t28

pistons, rods, cams, sleeves, 1000cc injectors, etc are basically worthless for a sub 300hp build. it doesn't matter what your motor can do, it matters how much power the turbo will support, and you're tapped out.

And I hope you had a line hone done for the ARP mains, if nor you've warped the main bore and pinched the ends of the bearings by a few thousandths which means you're fucked.

ask me how I know? I've worked on more rb20s than I care to think about.

petroi77

ya line hone was done. but with the rb25 open at 1 bar should'nt i see a little more power? and with the larger compressor even more? i know you say most of what i've done is over kill and your right but i would like the engine to last a while.

TheShodan

iTrader: (14)

with the compressor cover, no. A T28 and the turbo used from the RB25 are very similar. I'd be surprised if you saw a difference. if it were, you'd have to be at pretty high boost pressure to see any significant changes.

LTCxD2B

Rb25 stock turbos explode with too much boost ... Ceramic wheel

petroi77

its only the turbine thats an rb25 the compressor is from a bigger turbo closer to a t3 don't know what its from though. the mechanic say's he's had its safety is around 1.2 bar.

wantboost

iTrader: (2)

The rb20 and rb25 turbos have the same compressor wheel, a 60 trim t3 compressor wheel.

the rb20 has a t25 turbine housing while the rb25 has a t3 turbine housing and ceramic turbine wheel... 15-16psi is the physical limit for the turbine wheel, anything above that and you're past the shaft speed limit of the wheel and it will fail.

almost every rb25 turbo I've seen run above 16psi ends up having the turbine wheel sheer off the shaft.

in your case the compressor wheel is a non issue, the turbine wheel is the limiting factor due to size and design... you've got a motor capable of support over 600hp but a turbo that can't even make 300... See the discrepancy here?

petroi77

i get what your saying but i would have thought that i should be able to get something around 300 WHP the extra engine power and the extra 0.2 bar of turbo should beable to make at least 20WHP and get me to that, i would have thought anyway

Freemananana

iTrader: (3)

I think the engine power is irrelevant because the turbo will only flow 'x' amount of air. So it's going to top out at the limit of the turbo regardless of motor.

petroi77

ok so i understand that the extra engine power won't give me extra WHP and the larger compressor won't give me extra power either, but the rb25 from 0.8 to 1 bar should make a difference thats 3 psi which brings the turbo up from 11.6 psi to 14.5 and i still hav'nt maxed out the turbo yet.

wantboost

iTrader: (2)

Raising pressure won't do anything. the turbo was already maxed out before... raising pressure will just cause the IAT to increase potentially causing a drop in power and economy.

you can have the biggest, baddest motor on the planet but if the turbo only flows enough air for 275hp then that's all the power you'll get.

petroi77

so at what bar/psi should i have this turbo limit set at to get the most power out of it without causing a drop in power and economy?

EsotericImage

iTrader: (8)

^^
This

Your missing the point. Get a different turbo that matches your power goal. Period!

http://www.squirrelpf.com/turbocalc/

petroi77

right now that's not in the card for me, if i can't get anymore HP out of the car with this turbo then i can't, in the future i hope. right now what i wanna know is what my psi/bar safety limit is for this turbo, since it seems that 1 bar its too much

EsotericImage

iTrader: (8)

look it up on the link I gave you and youll find out just how much your snail can push before it blows hot air.

wantboost

iTrader: (2)

Much above 14-15 it's just hot air...

your turbo is done. be happy with the power it already makes or go bigger.

those are your only 2 options.