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Old 03-27-2009, 05:53 PM   #1
cowboy_Rob
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Join Date: Nov 2008
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Location: Camp Hill PA
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2003 Impreza WRX
PSM

Default some basic rebuild questions

motor is from an 04 sti

not really a rebuild as just replacing the pistons since i cracked one.

looking at wisecos since i can get a good deal on them and theyre a pretty good brand.

what kind of headgaskets is everyone using? are stock good enough for 400ish on a good tune? im not there yet but i think that would keep me happy for awhile.

stock timing belt, gates from carquest or reinforced belt?

i've heard some different numbers on the limits of the stock rods. im not planning to change them but id like to know what they are capable of. one person in the 2.5 forum said 450-500 my buddy says someone told him 650-700 i know they are forged rods but that seems insane for a stock part.

any special tips or tricks i need to know for pulling the motor? why does everyone talk about having problems with the cam gears. do they need to come off the pull the heads? most motors ive worked on you can take the cams out with the gears still on or leave the cams in the head and take the whole thing off.

i do have the service manual pdf but im still looking through it its kinda hard to find info in since its split up so weird
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Old 03-27-2009, 06:32 PM   #2
carnz-pj-410
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1995 2.5 RS Clone

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I'd personally go with CP Pistons instead of Wiseco. I've had good luck with Cometic and Cosworth headgaskets when going for high power.

The timing belt is preference I think, if you're running large cams i'd recommend the STi upgraded belt (Part Number: ST130284S000). Some friends and I have used it with no issues at all.

I'm not sure on the stock rod limits, maybe someone else can chime in with some better info on that.

And about the cam gears, the 10mm hex bolts that hold on the cam gears are a PITA! Definately get a 1/2 inch drive 10mm hex socket with a long breaker bar when trying to break them free. It seems like Subaru had Godzilla tighten those bolts down

hope that was of some help
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Old 03-27-2009, 08:20 PM   #3
Fongers
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CP's or Wisecos are both good, I've had both. You'll need the gears off to reseat the oil seals proper. Take the old belt and jam it into the gears with a vice grip to protect it (search my posts and I have a pic somewhere floating around) and then break them open. You might want to get 12mm bolt heads while you have it apart as the parts will cost you less than $10 and it will be a lot easy to take apart later as the hex heads are really prone to stripping.
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Old 03-29-2009, 03:13 PM   #4
cowboy_Rob
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another question i have is do i need to do anything special with the avcs. im still using the wrx ecu and harness so its not hooked up but do i need to do anything different then normal setting the timing belt? and what all will it take for me to make the avcs functional? im guessing sti ecu and harness or add the wires to mine? i have tgv deletes so i do have extra wires running out there already
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Old 03-29-2009, 04:03 PM   #5
Fongers
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You should either plug the oil oils up for AVCS or you'll need to do a complete sti ecu/harness/sensors/hubs swap to make it all work right. Its probably not worth it but up to you.
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Old 03-29-2009, 04:25 PM   #6
cowboy_Rob
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well i bought it with the swap done already. it uses the wrx ecu, harness and intake manifold/throttlebody. theres nothing plugged into the avcs solenoids but im not sure if they plugged anything or not. im just not sure if the timing belt needs setup different or not. im assuming the avcs works by advancing/retarding the cam gears with oil pressure?
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Old 03-29-2009, 11:37 PM   #7
Maxwell Power
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factory head gasket is fine.
Aftermarket gaskets are only required to compensate for machine work done to the head or block.

Don't overlook JE pistons.

If you are putting on bigger cams and valve springs, it couldn't hurt to go with a stronger timing belt. However, many people use the factory belt at high horsepower levels.

I've seen some STi's make 535whp on the factory rods, but that always makes me nervous. Tim Bailey missed a shift (or something) once at the drags and bent a rod, but it didn't break which is pretty amazing.
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