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02-29-2008, 12:48 AM | #1 |
Scooby Specialist
Member#: 63249
Join Date: Jun 2004
Chapter/Region:
TXIC
Location: HouStoned
Vehicle:2004 2.5 STI Wagon 05 FXT Black |
Got my compression test, now how to rebuild?
well my Hybrid motor made it about 17k with 300+whp till it started to blow out crazy amounts of oil..
did a compression check, DF-165 PF- 165 DR- 90 PR- 190?(carbon build up maybe?) guessing rings or something to do with the piston(ringland maybe?) so im looking at a set of Wiseco pistons, 100mm bore keeping, my hybrid 9:1 CR.. should those hold up for the 400-475whp i am looking for?? i also came across a set of DPR stg 3 sti cams for a decent price that i have been waiting on dropping in till i needed to pull the motor again.. i know i need springs and retainers to run these cams, will the brian crower set be well enough?? will i be able to my stock valve buckets with these cams? i know mine are shimless already.. i am also looking to upgrade my td05-18g 7cm to a 7cm 50 trim, with the set up from above, im already running an EWG, does this seem like a 400-450whp set up?
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02-29-2008, 08:12 AM | #2 |
Scooby Guru
Member#: 9960
Join Date: Sep 2001
Location: in bed...
Vehicle:2002 Impreza WRX WRBlue Perl |
what about your transmission?
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02-29-2008, 08:41 AM | #3 |
Scooby Specialist
Member#: 63249
Join Date: Jun 2004
Chapter/Region:
TXIC
Location: HouStoned
Vehicle:2004 2.5 STI Wagon 05 FXT Black |
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02-29-2008, 01:11 PM | #4 |
Scooby Specialist
Member#: 64466
Join Date: Jun 2004
Chapter/Region:
MWSOC
Location: Grand Rapids, MI
Vehicle:05, STI on green |
18g wont be enough to get 400-450. It'll be blowing hot air. Go with a fpgreen or red.
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02-29-2008, 06:14 PM | #5 |
Scooby Specialist
Member#: 63249
Join Date: Jun 2004
Chapter/Region:
TXIC
Location: HouStoned
Vehicle:2004 2.5 STI Wagon 05 FXT Black |
yeah, thats what i was going to do is upgrade my 18g to a 50 trim(green) but keep the 7cm side since i am EWG anyways and i need quicker spool for the auto, not more top end from a 8cm housing
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03-02-2008, 01:46 PM | #6 |
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Join Date: May 2006
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MAIC
Location: Mountains
Vehicle:Its like a STI..... but it doesn't break |
any reason why you think your motor died so soon?
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03-02-2008, 10:26 PM | #7 |
Scooby Specialist
Member#: 63249
Join Date: Jun 2004
Chapter/Region:
TXIC
Location: HouStoned
Vehicle:2004 2.5 STI Wagon 05 FXT Black |
well, my tuner was running a decent amount of timing, with the higher compression, and an 18g pushing 19psi..
i kept the plugs, 3 of them were white, the dead cyc was normal looking.. i will try to get some pics up here soon... so with the compression that low, is it a for sure thing its a piston/ringland? or could it be a valve or something else, the motor idles fine, just massive oil blow by.. |
03-03-2008, 08:16 PM | #8 |
Scooby Specialist
Member#: 98709
Join Date: Oct 2005
Chapter/Region:
NESIC
Location: Saugus, MA
Vehicle:2005 Impreza WRX 18g EWG + Meth |
If theres that much blow by like you say my guess would be a piston issue. If it just wasn't holding compression I would say check the heads and make sure the valves are seating correctly.
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03-03-2008, 11:41 PM | #9 | |
Scooby Specialist
Member#: 63249
Join Date: Jun 2004
Chapter/Region:
TXIC
Location: HouStoned
Vehicle:2004 2.5 STI Wagon 05 FXT Black |
Quote:
just wanted to make sure before i go dropping the cash there it dont belong.. so forged pistons here i come... going with 100mm will be better right? so the machine shop can make the block fit the pistons? |
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03-04-2008, 05:08 PM | #10 |
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Member#: 24890
Join Date: Sep 2002
Chapter/Region:
SCIC
Location: All I wanted was a Pepsi
Vehicle:2002 Jackwagon WRB GG |
You might want to find some pistons that will lower the CR back to stock specs. It will be easier to tune and less prone to detonation.
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