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Old 04-21-2001, 10:20 PM   #1
MagicMT
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Question EJ20 vs EJ25 (Turbo vs Turbo)

Who would win? What are the pros and cons of each? Performance? Reliabilitiy?
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Old 04-22-2001, 12:55 AM   #2
bsquare
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The answer depends on far too many variables to provide a short answer. How about "it depends"?
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Old 04-22-2001, 05:24 AM   #3
Keiho
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Yea...it depends.

Let's say stock EJ20 on the MY02 WRX and a Vishnu'd EJ25. In this scenario the EJ25 will win barring transmission failure.
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Old 04-22-2001, 08:15 AM   #4
markus
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My vote goes for Minnam/Vishnu EJ25.
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Old 04-22-2001, 08:27 AM   #5
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My vote goes to whoever has the most $$$. An EJ20 can produce ungodly amounts of HP and TQ. Be real. Think Rigoli.

Ken
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Old 04-22-2001, 07:26 PM   #6
Digital_Boy
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My vote goes to the turbo EJ25.

When running on stock internals, an EJ25 can make somewhere above 300HP at the crank. Shiv just proved this recently, and there are numerous others who've done the same.

I'm unsure what the EJ20 is capable of sustaining, since Simon Lines from Prodrive has stated that the EJ20 is only good to 280-300HP reliably. Others have differing opinions.

However, when you change pistons/rods and engine management, then the advantage of the EJ25 becomes even more evident.

The EJ20 is a great motor, and I think there'll be a few people who swap in some forged higher compression pistons to help cure the WRX's off boost bog.

But for my tastes, which include abundant torque down low for powering out of corners on the track or at the auto-x, I'll take a turbo EJ25 with good engine management.

On an endurance course, where you're keeping the car in a relatively narrow powerband, the EJ20 might make better sense.
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Old 04-23-2001, 01:48 AM   #7
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ken - are you ever right?
think rogoli? then think ASR!
if someone spent as much money on a 2.5L as the rigoli wrx then i would vote on the RS. if you look at it this way, the RS may have weaker internals than the WRX, but the wrx sure isnt running on many stock internals (if any!) when cranking out so much torque.
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Old 04-23-2001, 02:58 AM   #8
MichiganRS
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Sweet n simple and straight to the Point

EJ20 - Lower compression PRO (more boost)
EJ20 - Smaller displacment CON
EJ20 - Less low down torque CON

EJ25 - Higher Compression CON (with turbo)
EJ25 - Larger Diplacment - PRO
EJ25 - More low end PRO
EJ25 - Sexy headlights PRO
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Old 04-23-2001, 03:44 AM   #9
Digital_Boy
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Not quite that cut and dried Michigan.

My boost built short block from ASR will be 9:1 compression, maybe 8.8:1 if I get the thick metal head gasket from Subaru.

That's only .7 to .9 down from stock (9.7:1), and will be capable of taking 400HP and torque. Off boost response will be very much like stock, so I'm not really losing much at all in response.

The EJ20 turbos are a much softer 8:1, so they can run more boost, and they'll exhibit really nice top end pull when all the restrictions are removed (like the 3 cat setup), but will still be soft off the line.

IMO, given that once you venture too far from the simple mods of boost controller, RRFPR for the EJ20, or a 8PSI turbo kit on an EJ25, you'll want to do internal mods and add an aftermarket ECU, so while the engine's open, might as well bump the static compression up half a point or so on the EJ20, and down half a point or so on the EJ25. Would serve to wake the EJ20 up a bit.
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Old 04-23-2001, 07:31 AM   #10
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For what it's worth, I posted the results of a dyno test of my friend's WRX STi Type IV alongside my Legacy B4.

Kinda cool to see how the single vs. twin turbo setups deliver their power...

The test conditions were identical and the writeup of how to interpret the results are pretty much the same.

WRX STi Type IV Dyno Results

Cheers.
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Old 04-23-2001, 10:59 AM   #11
MY99 2.5GT
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I think a properly prepared and reinforced EJ25 would kick some EJ20 butt.

Forged ShortBlock
Forged Pistons
Forged Rods
Forged Crank
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Old 04-23-2001, 12:52 PM   #12
DeliciouSpeed
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Point is Nick, when getting real...Spending $$$ an Ej20 can hang with an EJ25. Don't belive it. keep the Ej25 and move on with your life. See ya in the Jungle.

Ken
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