High powered Rb20's

[DriftingisLame]

I am just wondering a little about the potential of my motor in a very high powered state. Can anyone tell me just how much whp/wtq the rb20 is capable of?

In case anyone's curious, I am going to be running a t3/t04 (50 trim), greddy e-manage ultimate, and a FMIC. I am shooting for around 300 whp. What sort of power would you expect out of this setup? Also, when will I need to be concerned about upgrading pistons/rods/HG/etc.

Yes i know, 2 totally different Q's, but I hate having multiple topics..

Any help is greatly appreciated!

-Max

[240+civic=pimp]

You can see 400 whp out of a rb20 but you need $$$$$

I have an hks Gt turbo .64AR 63 trim

Intake, full 3.5 in exhaust, boost controller, programed ecu, huge FMIC

With this set up i can see 300 whp at high boost (15psi)

You won't need internal with any of the mods you have.Though you dont want to boost any more than 15psi with stock injectors and you really shouldn't boost more than 15 on stock head gasket.

The head gasket will hold more but i wouldn't count on it lasting forever.

[goofynick6]

I've seen 497whp by wdracing on here (cams and thicker headgasket), I made 330whp, you can do it easily with that turbo you have.

Nick

[DriftingisLame]

Cool thanks guys, do rb25/26 injectors fit? Because I have some from my rb25 i could use.

Does anyone know of the record HP on an RB20?

[240+civic=pimp]

Rb25 injector won't work they are side feed.

As for the 440cc rb26 injectors they will work but you need a resistor pack.

I have the injector and also a resistor pack for sale if you need them

[krayton]

I've seen 497whp by wdracing on here (cams and thicker headgasket), I made 330whp, you can do it easily with that turbo you have.

Nick

he was also running alchy. he got there, but i believe he was going nuts with it.

still capable though

[themadscientist]

The baddest I ever heered of was 600+with a T88 by I think Rising, my memory fades though. It was a stroker though, a 2.4 I beleive which is kind of cheating. Most power with the stock bore, I think you could get 500hp. There were a dozen or so 400+hp RB20s prowling around when I got to Japan in 94'. The GT-Rs had a learning curve as the first cars they had to beat when the car came out were R31s and 32s with stupid-powerful RB20s, It took them a year or two

[DriftingisLame]

Hmm, thats kind of dissapointing...

Not like I'm looking for that much power, its just that CA's and SR's are capable of much more, and I think much higher of the rb20 compared to the others.

I figured it would be capable of around 850.. Maybe it is and its just not that popular of an engine..?

What holds the motor back after 500?

[themadscientist]

I would suspect the catastrophic boost levels required to get there combined with the tiny bores. I am not a guru of thermodynamics but I am reasonably sure the tiny bore size is a hinderance. 850hp is a serious feat on an RB26, getting that much out of a CA, SR or RB20 is no easy feat.

[driftjunke]

Well if Hondas can put out 600+ boosted on 1.8 to 2.0 4 bangers, then really 600+ shouldn't be unfeasible if you have money to dump into it, the highest we have gotten is 338/297 at 15psi with 440's, xspower t3/t4 .63 ar 50 trim (we're trying their t70 .83ar this week) 24x12x3 FMIC, SAFC2 to tune, WALBRO 255, stock regulator, external 40mm wg, with a modified turbo manifold (we're making a log style to position the turbo differently with bigger runners and external WG) full 3inch straight pipe exhaust, and stock internals. So we're hoping with cams, better more efficient turbo, minor headwork, metal HG with ARPS's Head bolts, bigger injectors(flashed ecu with safc2 or emanage) we should see 400+.

We are currently building a RB20 for our RHD vert to run with the AEM system on and try to see more than 600 to the wheels.

The RB20's I think are how the KA's we're perceived before eveyrone started boosting them, they have potential.

E

[blues14]

400-500 hp on a motor that hasnt been made for over a decade is not bad. especially considering that you can get an entire r32 gts-t front clip for the price of a crate Honda B16a that only makes 160hp and like 125 ft lbs. My buddy has a bone stock rb20 in his s13 and he took his car to the track along with his bros modded STI and the STI couldnt get under 14.2 and the 240 ran a best of 14.6. thats a $6,000 car capable of hanging with a factory 300+ hp $32,000 car. you dont need 600 hp to make an s13 crazy fast. these guys that professionally race their 600+ hp imports typically rebuild their engines fairly often. I dont know about you, but i dont have the time or money to do that.you get 300-325 hp at the wheels, you will be more than likely taking out supras, stangs, and a few Vettes, and still retain most of the motors great reliability.

[DriftingisLame]

Well if Hondas can put out 600+ boosted on 1.8 to 2.0 4 bangers, then really 600+ shouldn't be unfeasible if you have money to dump into it, the highest we have gotten is 338/297 at 15psi with 440's, xspower t3/t4 .63 ar 50 trim (we're trying their t70 .83ar this week) 24x12x3 FMIC, SAFC2 to tune, WALBRO 255, stock regulator, external 40mm wg, with a modified turbo manifold (we're making a log style to position the turbo differently with bigger runners and external WG) full 3inch straight pipe exhaust, and stock internals. So we're hoping with cams, better more efficient turbo, minor headwork, metal HG with ARPS's Head bolts, bigger injectors(flashed ecu with safc2 or emanage) we should see 400+. E

How do you like the SAFC for tuning? I'm thinking about waiting on the e-manage mostly because its brand new and I want some feedback before i drop $500. Do you use a wideband? My turbo is actually .50 compressor .53 turbine. Do you think that with a front mount, tuning with an SAFC, that I could hit similar #'s to yours? I have some minor other mods such as 3" exhaust/walbro/afpr/external wg, but otherwise I'm running stock everything.

[Yellow4g63]

the Limiting factor might be the head. It prob needs to be ported out to imporve the flow.

[themadscientist]

good point, the 20 does have some dinky ports. Anybody care to try a welded-up 26 head ?

[rbsileighty]

Does anyone have the diameters for the 20's intake and exh valves?