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Old 01-31-2002, 09:19 PM   #1
Scooby Specialist
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Default ej20 max hp

just a couple of quickies!

what is the max hp the ej20 in the wrx will hold safely without having to build anything up?

how much hp will a vf22 or vf23 make?

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Old 01-31-2002, 09:41 PM   #2
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Well in excess of 400hp at the crank. Nate and Al already hit that mark and haven't opened the motor.

The VF22 and VF23 will both peak before you nee to replace stock internals.
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Old 01-31-2002, 09:57 PM   #3
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You need to be a little more clear about what you're asking.

Build anything up? Does that mean rods, etc...? So far people have gone well into the 300s at the wheels before needing significant engine build up. You'll likely need to thing about a stronger tranny before you think about building up your engine.

And when you say vf22/23 which? they're very different turbos.

Do you mean IF you build up the rest of your car to get the most out of a vf22/23 (like an ECU replacement, up-pipe, down-pipe, cat-back, Throttle body porting, IC upgrade, CAI, Extrude honed intake, injectors, fuel pump, fuel rail, etc...) I mean you have to be more specific if you want someone to give you a reasonable answer.

Without fueling upgrades no turbo will make more than ~250 reliable HP or so, MAYBE 260 or so MAX (I'm talking at the wheels, not the sometimes inflated crank numbers, that are virtually meaningless anyway). From what I've seen, ANY upgraded turbo has the potential to max the stock fuel system with the right set of other mods. So fueling has to be included.

Without exhaust mods, an upgraded turbo is going to be excessively laggy.

Without intake mods and exhaust mods, any turbo is going to be losing potential, especially at the top end, same goes with doing head work, etc...

I think you're going about it the wrong way. You have to look at what you're after. Define your goal, and what kind of driving you do, then look at what might best fit that goal and your driving conditions. The vf22 and vf23 are an excellent example. The vf22 is built for top end, more, I think, than any other 'drop in' turbos that IHI makes. The vf23 is much more of a midrange type of 'all around' turbo which will do much better in the drivability range (2k-4.5k or so) than the vf22, but you'll give up the top end capability of the 22 (5k+)
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Old 02-01-2002, 07:00 AM   #4
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More than 300HP at the wheels on standard EJ20 internals? Why do American horses often seem so much smaller than European ones?

Last edited by worry; 02-01-2002 at 07:25 AM.
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Old 02-01-2002, 09:17 AM   #5
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Yeah...was thinking the same really, must be the european air or something.
All I know is that Swedish horsies seems awf strong by comparison, I don't seem to need as many to achieve similar results..

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Old 02-01-2002, 09:21 AM   #6
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You're flogging a dead horse, here, or should I say "pony"

I'd just about given up trying to understand the comparative differences between the US figures, and the rest of us, when it come up in conversation with a very respected US tuner.

He also finds it strange that there is such a disparity, and concluded that it must down to the software used in the states.

The ATW figures these guys are getting, are FAR higher than us, but they seem to have very little drivetrain losses. I know how hard it is to get 220bhp ATW's, from an STi (276bhp atc) let alone from a Euro spec', running 12psi

Both Europe, and the US, each get consistant figures (+/-) I don't believe the US tuners have found some magic formula, and that only leaves the dyno software.

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