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Old 01-30-2005, 10:39 PM   #1
Davenow
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Default 02 WRX motor gone.. V7 longblock or USDM STI 2.5 shorty???

One one hand, if I do the 2.5 STI shortblock, I get
Brand new headgaskets, TON of torque gains.

If I do a V7 longblock (without AVCS active) I dont get any torque gains to speak of, but I DO get an 8000rpm redline....it would get my VF22 and my utec. I already have the rest of the parts.


SO, do I do the 2.5 and get the torque
Or do I do the V7 budget longblock and get the 8000rpm redline, but not really any more power to speak of???
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Old 01-30-2005, 10:46 PM   #2
thesmokingman
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That's a tough one. Rev it out fun, or stomp on it fun? I prefer stomp'in on it in day to day driving.
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Old 01-30-2005, 10:47 PM   #3
Capt Crunch
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Why wouldn't you have avcs on? It's so easy to wire. Would you be using a WRX ECU or something?

Also, what transmission do you have? If you have tight gears, the V7 longblock would be a hoot to drive, whereas you wouldn't feel the benefit so much on the 2.5
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Old 01-31-2005, 01:35 AM   #4
Soon2Bgreat
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As much as i hate to say it, your better off with the 2.5 imo. It will make more power, and you won't have to worry about lag between shifts at the track. With a vf22 the strength won't be a factor as it should hold anyway... The 2.5 is tough to beat honestly. I still like the 2.0l though for traditions sake
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Old 01-31-2005, 08:49 AM   #5
Davenow
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No avcs as its a budget longblock, only way I can afford it, no ecu, no intake manifold etc...

I have a stock 5mt right now, but its on its way out, so I will be doing an RA gearset.

the "rev it out or stomp on it" is exactly my problem.
I love to stomp on it day to day, but I want to take the path to overall greater speed.
With autocrossing in mind too, I am thinking the 2.0, so that the shorter gearing of the RA doesnt make me have to go into 3rd...
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Old 01-31-2005, 10:27 AM   #6
Capt Crunch
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since you're an autocrosser, you're never going to get to the power levels that would require a JDM motor over a USDM block.

I think the more instantaneous response you get out of midcorner from the 2.5 would help counteract the 3rd shift you would need.
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Old 01-31-2005, 10:32 AM   #7
Davenow
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but autocross isnt the only thing I do,

I also drag race a little, and my main thing is just having a FAST car.
I LOVE the feeling of being slammed back in the seat, now while that tells me that the 2.5 is the obvious choice, I also want to put overall speed as my main priority. I am thinking that the 8k redline will match with the RA gearset better than the 2.5. ANd that the ra gearset coupled with the 2.5 and lack of flow from WRX heads= uselessly short powerband.
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Old 01-31-2005, 02:05 PM   #8
squirrelmasta
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i would go with the 2.5, then mate it up with the RA gear set (not the path i would take, i like the 6speed), and then when you want the higher red line, do some head and valve train work--->theres your 8k redline, Bobs your uncle and you win the auto cross and drag.
-Eli
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Old 01-31-2005, 10:33 PM   #9
totoherbs
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I say 2.5 too... I dont think you will be happy with a jdm motor and no avcs.
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Old 02-01-2005, 03:57 PM   #10
wannaberacing
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I've got the 2.5l with wrx ported and polished heads ECUtech 8,000 rpm is easy
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Old 02-01-2005, 04:00 PM   #11
wannaberacing
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If you have the 2.5l ... later you can put a rotated GT30R on it and get 350whp on 91 octane at 17lbs. Your new set up could last 80,000 miles.
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Old 02-01-2005, 05:52 PM   #12
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I know Mauro Motorsports is selling their used usdm sti motor for about $1000 from their project car. The motor is in perfect condition and is on hold at Metric Subaru waiting for a new owner=) Mauro is only selling cause he's getting the Axix 2.5 upgrade. If interested you can call him at 631 451 3996. Let him know Chris Atienza sent you=)
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Old 02-01-2005, 10:00 PM   #13
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Quote:
Originally Posted by TRTrex
I know Mauro Motorsports is selling their used usdm sti motor for about $1000 from their project car. The motor is in perfect condition and is on hold at Metric Subaru waiting for a new owner=) Mauro is only selling cause he's getting the Axix 2.5 upgrade. If interested you can call him at 631 451 3996. Let him know Chris Atienza sent you=)
Check the SE forum, a guy is also selling an STI shortblock if you just want to upgrade.
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