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Old 03-24-2001, 03:16 PM   #1
Scooby Specialist
Member#: 730
Join Date: Jan 2000

I would disagree with the comment that the EJ20 is stronger (assuming you mean the cylinders/cylinder deck) because some of the EJ20's were closed deck. The EJ25 is good to 500HP before you need to close the deck. The EJ25 is a newer design, and incorporates many improvements to the earlier EJ20's.

The EJ25 with a turbo is a better car for a daily driver due to the inherently better off boost torque. Also, having a 25% increase in displacement doesn't hurt either.

If you're building a track car, your options are as wide open as your checkbook can make them. You can build an EJ20 that will whip an EJ25's butt on the low end and top end, all it takes is money.
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Old 03-24-2001, 06:32 PM   #2
bill harvey
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the new wrx has a totally new designed ej20 so it's not because they had the motor sitting around.
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Old 03-24-2001, 09:12 PM   #3
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99 Impreza RS


All the new WRX's have a new bottemend casting design that appears to have an addition piece of metal built into the decking i suppose to strengthen the block

its in Impreza Magazine VOL. 9

anyway i personally would take an built EJ25 over an buikt EJ20 anyday.

look at the JUN car its fast as full. not much use for the track but still faster than any EJ20 i've ever seen.. (Regoli excluded)
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Old 03-25-2001, 12:51 AM   #4
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Question EJ20T vs EJ25T...

First off, yes I searched. Why did Subaru use the EJ20 instead of an EJ25 in the WRX? Wouldn't using the larger engine give it better off boost power?
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Old 03-25-2001, 12:57 AM   #5
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IIRC, they did it because the ej25 was solely invented for the US market...again IIRC, earlier imprezas had 2.0 or 2.2 models, why? because (all of this is what i understand, not saying its fact) japanese companies are taxed by displacement, anything over 2.0L is way taxed...

also it may have been because of FIA regulations on WRC cars, which restrict them to 2.0L AFAIK... so the street cars had to have those specs

(a lot of japanese 2.0L turbos , the lancer evo, WRx, the DsM triplets, etc)
also this may be unrelated but smaller displacement engines are usually more free revving, (good for quickly building boost maybe?)
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Old 03-25-2001, 12:59 AM   #6
David the Bold
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They did it to conform to WRC rules. Apparently the WRC cars engine has to based on a production engine. Also, they've had the EJ20 in production (and therefor development) for years everywhere else in the world. It's also stronger because of it's smaller displacement.

[whoops, looks like Prog beat me to the punch]

[This message has been edited by David the Bold (edited March 24, 2001).]
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