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Old 09-26-2007, 05:25 PM   #1
superg
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Join Date: Dec 2000
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2002 WRX
WRB

Default Experience with "simple" Ej205/257 hybrids?

I am considering an EJ257 shortblock but otherwise not changing anything on my stage 3 VF34 WRX motor.

There are lots of reports here on built motors here with pistons, cams, etc...

What outcomes, troubles, etc. have folks had with simple EJ257 shortblock swaps on stage 2-3 Ej205s?
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Old 09-26-2007, 05:40 PM   #2
mxpunk
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id say lots of torque
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Old 09-26-2007, 06:22 PM   #3
superg
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Yeah, torque for sure. I should have been more specific:

What longevity/durability/headaches can I expect compared to the original engine, which has been bulletproof for 130,000 miles.

Superg
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Old 09-27-2007, 01:20 AM   #4
wrxed04
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Same question I have - blew my engine, considering a hybrid w/reworked stock wrx heads and sti short block. Any recommendations on related mods and likely cost?
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Old 09-27-2007, 01:52 AM   #5
Living Weapon
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Would love to hear from those who have done this with a stock or mildly prepped bottom end.

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Old 09-27-2007, 02:37 AM   #6
reddevil
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As long as the compression ratio is worked out properly (ie, no 12-1, or valves tapping pistons), longevity, durability should be 100% on a new ej25 shortblock. Why? Cause its new.
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Old 09-27-2007, 03:05 AM   #7
Living Weapon
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Duh, I finally figured out the right search terms: 2.5 hybrid

Turned up a bunch of good info regarding possible headaches, and how to avoid them
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Old 09-27-2007, 04:27 PM   #8
superg
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Default My hope

I've done the 2.5 hybrid search, too.

What I am hoping for:
Assuming my WRX heads are in good condition; newish VF34, new EJ257 shortblock; replaced "wear items" like water and oil pump, timing belt; well and conservatively tuned Ecutek without pushing boost levels; UP, DP...
... should last as long as a fresh EJ205 similarly set up, say at least 50,000-75,000 miles.

That is, assuming its assembled well, driven respectfully and well maintained.

Anyone have evidence for or against this scenario?

The heads being the oldest part of the hybrid, will they be the "weak link" going forward?

Superg
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Old 09-27-2007, 08:30 PM   #9
PeteDucati
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Detonation is the only thing you need to worry about with the standard hybrid swap - the pistons crack ring ring lands easily. How does that happen? Not enough fuel/too much boost/timing. If the tune is conservative and you're not pushing things your setup will last just as long as a USDM STi - 'cause that's pretty much what you've got (minus the AVCS and STi cams).
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Old 09-28-2007, 01:28 AM   #10
Twiztidunreal
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i am running a hybrid
ej257 SB(stock) with 04 wrx heads(only 30* backcut valves) other wise stock, fmic, headers, lightened crank pulley, and a 18g to boot..... as long as the tune is good, the 9:1 compression helps off boost power as well as spool up, and u make the same/more power with less boost
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Old 09-28-2007, 01:34 AM   #11
Twiztidunreal
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Quote:
Originally Posted by PeteDucati View Post
Detonation is the only thing you need to worry about with the standard hybrid swap - the pistons crack ring ring lands easily. How does that happen? Not enough fuel/too much boost/timing. If the tune is conservative and you're not pushing things your setup will last just as long as a USDM STi - 'cause that's pretty much what you've got (minus the AVCS and STi cams).
ive heard this, but(flame suit on) my mbc is set at 16 psi right now, my real time map is for 18psi, my base map 13psi... 2 twice now when my battery cable came lose, it reset my ecu, there for bye bye real time map.
i didnt think anything of it, took off, got on the freeway, got up on it, car hits 16 psi, cell flashs, car pulls timing(i assume from knock sensor detecting det.)
this has happened twice now(i hope never again), and also why i will get a real base map made for my psi instead of a OTS map.
Car still runs fine, compression fine across the board
mind you this is at lower power(16psi) at higher power, i can see det. killing the pistons

C.N.
its all in the tune..
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Old 09-28-2007, 12:45 PM   #12
Le Saboteur
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stock block (2.5) stock headssss (2.0) VF39 17psi

replaced all necessary stuff
injectors
fuel pump
oil pump
belts etc
i think thats it...can't really go past 17psi w/o alc or headwork

timing pulled back a good bit...

torque is really fun i run all over my girlfriends evo...for now...
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Old 09-28-2007, 10:28 PM   #13
Redscoob
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i have a 2.5sb with 2.0 heads from my wrx running 12lbs with timing pulled to be safe. i ran a 13.01 with the stock wrx intercooler. tons of low end power and no waiting for boost on the vf39.
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