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Old 07-29-2007, 02:45 AM   #1
jbones
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goal-build a 500+whp =)

Default wrx vs sti engine

just wanted to know, is the 06 wrx engine the same size as the 06 sti? i know there 2.5l does that mean there truely the same. pistons, rods etc in size?
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Last edited by jbones; 07-29-2007 at 03:09 AM.
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Old 07-29-2007, 03:17 AM   #2
solarin006
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WRX....Description...........Part Number
Block set.........................11008930
Cylinder Head L.................11063AB250
Cylinder Head R.................11039AB820
Piston Set........................12006AD210
Piston Ring Set..................12033AB340
Rod Assembly....................12100AA180
Crankshaft........................12200AA330
Exhaust Valve....................13202AA570
Intake Valve......................13201AA371

STi.....Description.............Part Number
Block set.........................11008930
Cylinder Head L................11063AB330
Cylinder Head R................11039AB910
Piston Set........................12006AC390
Piston Ring Set..................12033AB340
Rod Assembly....................12100AA180
Crankshaft........................12200AA330
Exhaust Valve....................13202AA570
Intake Valve......................13201AA371
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Old 07-29-2007, 04:46 AM   #3
Dana Daray
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OBP

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^ well that sums it up.......good looking out.
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Old 07-29-2007, 07:57 AM   #4
tundra
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I'm really curious if anyone has really quantified the piston differences. We know that the sti pistons were never the greatest, but I wonder how the wrx pistons compare strength wise....
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Old 07-29-2007, 08:13 AM   #5
Unabomber
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Quote:
Originally Posted by tundra View Post
I'm really curious if anyone has really quantified the piston differences. We know that the sti pistons were never the greatest, but I wonder how the wrx pistons compare strength wise....
That's something we will never know.
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Old 07-29-2007, 03:11 PM   #6
ARORA_808
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What about the oil pan? I asked this question a few weeks ago and never got an answer.......My reason for asking is I want to go to EL headers, but if it means changing the oil pan.....I'll pass.
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Old 07-29-2007, 04:01 PM   #7
emeterioy
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swp

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when they install my perrin el headers they said that the stock oil pan was on the way of the headers so I had to buy a aftermarket one..
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Old 07-29-2007, 06:14 PM   #8
NeedBoost21
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ISM

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yeah, they have to modify the oil cooler assembly. I have the perrin el header, and they had to order the oil cooler assembly from a 2005 sti model. it works and the car sounds great
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Old 07-30-2007, 12:06 AM   #9
jbones
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goal-build a 500+whp =)

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ya seriously that guy summed it up, i guess since im planning to build my block. i can blow a piston and tell you how much power it took, thats something a friendly person would do =)
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Old 07-30-2007, 02:44 AM   #10
BoozeRS05
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wagon, 5mt

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What are the differences between them & the 05 LGT?
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Old 07-30-2007, 06:49 AM   #11
dheruer
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So, if i'm correct..

Getting STi Pistons + cylinder heads, will turn a WRX engine into an STi engine? That's the only difference i could spot from this list? That'd mean an easy extra 30-40 hp, and 750rpm higher redline then?
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Old 07-30-2007, 10:52 AM   #12
wrxfactor
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Quote:
Originally Posted by dheruer View Post
So, if i'm correct..

Getting STi Pistons + cylinder heads, will turn a WRX engine into an STi engine? That's the only difference i could spot from this list? That'd mean an easy extra 30-40 hp, and 750rpm higher redline then?
What's the redline on the 06 WRX's? I thought it was still like 71 or 7200 RPM.
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Old 07-30-2007, 10:55 AM   #13
drfrink24
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Quote:
Originally Posted by dheruer View Post
So, if i'm correct..

Getting STi Pistons + cylinder heads, will turn a WRX engine into an STi engine? That's the only difference i could spot from this list? That'd mean an easy extra 30-40 hp, and 750rpm higher redline then?
Don't forget the bigger turbo....
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Old 07-30-2007, 11:06 AM   #14
dheruer
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Quote:
Originally Posted by drfrink24 View Post
Don't forget the bigger turbo....
Got that covered
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Old 07-30-2007, 11:06 AM   #15
dheruer
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Quote:
Originally Posted by wrxfactor View Post
What's the redline on the 06 WRX's? I thought it was still like 71 or 7200 RPM.
bout 6700
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Old 07-30-2007, 11:13 AM   #16
Pain++
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Urine-soaked Subway Car

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Quote:
Originally Posted by solarin006 View Post
WRX....Description...........Part Number
Block set.........................11008930
Cylinder Head L.................11063AB250
Cylinder Head R.................11039AB820
Piston Set........................12006AD210
Piston Ring Set..................12033AB340
Rod Assembly....................12100AA180
Crankshaft........................12200AA330
Exhaust Valve....................13202AA570
Intake Valve......................13201AA371

STi.....Description.............Part Number
Block set.........................11008930
Cylinder Head L................11063AB330
Cylinder Head R................11039AB910
Piston Set........................12006AC390
Piston Ring Set..................12033AB340
Rod Assembly....................12100AA180
Crankshaft........................12200AA330
Exhaust Valve....................13202AA570
Intake Valve......................13201AA371
Wow, that's some great information. It should be stickied, this question seems to get asked a lot around here...
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Old 07-30-2007, 11:15 AM   #17
dheruer
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Will the cylinder head and pistons bolt right on? Or are other modifications needed?
Such as camshafts? or oil? Seems so unreal that the heads and pistons is "all"...
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Old 07-31-2007, 03:09 PM   #18
putz
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Do The Part Numbers For The Heads Come As An Assembled Head With Cam Shaft?
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Old 07-31-2007, 05:20 PM   #19
mRak_Attack
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Ummm....dont forget the siginificantly weaker 5spd tranny in the WRX
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Old 07-31-2007, 06:55 PM   #20
dheruer
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Quote:
Originally Posted by mRak_Attack View Post
Ummm....dont forget the siginificantly weaker 5spd tranny in the WRX
Trust me.. I won't forget.

i just paid a total of well over 6000 EURO'S (so over 7500 dollars) to have it changed with PAR gears....

Damn the taxes and workshop costs
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