JDM EJ20T(STi) v.s. USDM EJ20T(WRX)

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10-14-2004, 08:09 AM

#16

ScoobieSnack

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RA Spec. C

I just did this swap too. I just tuned mine yesterday on the our Dynapack and made 350 whp without any problems. It's much easier to get the power out of this motor than the USDM block and heads. My only real question is how much boost this thing can take(JDM Sti RA spec C heads and block). I know it has forged rods and pistons so it should be able to take more that 22 psi which is what I'm pushing rith now. I don't have the AVCS hooked up yet and I noticed I lost a little torque and the turbo spools a little slower with the new motor. I can't explain it other than to assume that the valve overlap is much worse with the AVCS motor if you don;t have the AVCS running. I'm using a Link stand alone ecu right now but I'm about to switch to the AEM EMS w/ built in wideband. Imprezer, do you know what kind of max power the rods will take? I'm trying to get all the hp I can get outta this beast. I have a built 2.5 bottm end going in whenever this gets old.

Plus if you have any thoughts on the torque loss, I'd love to hear it. I'll send you some picts if you want to see 'em. It's pretty trick. I have the 6speed with full STi rear swap, flipped intake manifold and a custom garrett turbo conversion with SC61. I'd love to hear your input. You gotta love that 8k redline.

10-23-2004, 05:08 PM

#17

Pogi

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EJ20T v.s. I-speed 2.8L Short Block

O.k., since the JDM-spec EJ20T redlines @ 8000k and the 2.8L short block from I-speed also redlines at 8000k, which one would be the better choice? I know the JDM-spec EJ20T has AVCS but has a smaller displacement and the 2.8L I-speed shortblock has a bigger displacement(duh) but has no AVCS....

To make you guys understand where I'm coming from here, I'm trying to build a "streetable" track car. What I mean is that I wanna build a WRX motor that can handle power in the excess of 500whp or whatever horsepower level the 2.8L motor can handle at the max...

Any opinions would help me out...

MaRkY

10-23-2004, 10:28 PM

#18

awns729

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hmm, well it depends on mroe than redline, but i really dont know.they're botht good choices, the 2.8 liter ispeed short block would probably be easier to install, you wouldnt need the JDM ECU and the wires. Could you maybe get the 2.8 with the AVCS heads and the JDM ECU? MOre complex, but what a setup!

10-23-2004, 10:49 PM

#19

Kevin M

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For max power applications, you want a 2.35 liter stroker EJ22 engine. With forged internals, it's the strongest Subaru block available, with redline capabilites above 10k with the right internals.

10-26-2004, 08:12 AM

#20

Steppin Razor

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Quote:

Originally Posted by BAN SUVS

For max power applications, you want a 2.35 liter stroker EJ22 engine. With forged internals, it's the strongest Subaru block available, with redline capabilites above 10k with the right internals.

But you'll have to pay serious attention to cooling because a closed deck block isn't exactly efficient in those respects. Stout as hell? Yes. Cooling efficiency? Not as much.

Tim Kelsch
www.stoptech.com

10-26-2004, 08:36 AM

#21

ScoobieSnack

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Also, a high reving powerplant is not as important for a turbo car. Your trying to make your power with boost, not by reving the **** out of the motor. Better to go with the highest displacement and keep the RPM within reason. This will keep your motor in good shape and minimize wear on the engine. I would take a look at what Easystreet has done with stroking and poking the 2.5 Sti block. "There's no replacement for displacement." my two cents...

10-26-2004, 10:23 AM

#22

Kevin M

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If your coolant system has a nice large capacity, and your radiator is big and efficient, you won't have cooling problems. As for more displacement, when you bore out the motor, it gets inherently weaker. And with turbo OR NA cars, the more revs you can make power at the better. Remember that hp is a function of torque and RPM. The more revs you have, the more air you flow through your motor, whatever size it is.