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Old 06-24-2008, 12:12 AM   #1
ddolmyer
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Member#: 116074
Join Date: May 2006
Location: MICHIGAN
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2007 STI
Black

Default ah yes...another what should I do post....

I'm looking to take my motor to the next level. I currently have an 07 STI with the following engine mods:

* Speed Industry 3-port Boost Solenoid
* Walbro 255 Fuel Pump
* Power Enterprise 850cc Injectors
* APS 70mm Cold Air Intake
* Large TMIC
* Forced Performance Green Turbo (8cm housing, 3" inlet, ported & coated)
* Ultimate Racing Up-pipe (38mm External Wastegate Combo)
* GrimmSpeed Ceramic Coating (for up-pipe)
* TiAL 38mm Wastegate w/1 Bar Spring

I want to turn up the power and feel comfortable that my engine will hold. As far as internals what would be some good choices? I understand Crawford and Cosworth make sexy stuff but I'm not looking for 600whp....more like 450 or so. What are some other brands that would still make my engine a brick $hithouse?
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Old 06-24-2008, 12:35 AM   #2
St.race
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For your power level you would need to upgrade pistons only. (However if you would be pushing anything over 500 I would recommend rods and bearings.)
Many people purchased a short block from a Subaru dealer and replaced pistons for the forged. You can buy short block with forged pistons already installed from a many different companies including Crawford etc. Look for stage one short block.
Some Stage one short blocks comes with higher compression ratio pistons and other with stock.
P.S.:If your tuner is good enough you may not need any of this.
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Old 06-24-2008, 12:37 AM   #3
ddolmyer
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Quote:
Originally Posted by St.race View Post
For your power level you would need to upgrade pistons only. (However if you would be pushing anything over 500 I would recommend rods and bearings.)
Many people purchased a short block from a Subaru dealer and replaced pistons for the forged. You can buy short block with forged pistons already installed from a many different companies including Crawford etc. Look for stage one short block.
Some Stage one short blocks comes with higher compression ratio pistons and other with stock.
P.S.:If your tuner is good enough you may not need any of this.
I was under the impression I needed new pistons, rods, bearings, oil pump, gaskets and water pump. Also, could I just use my existing STI block?
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Old 06-24-2008, 12:40 AM   #4
St.race
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how many miles on it
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Old 06-24-2008, 12:43 AM   #5
ddolmyer
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now..... 21,000 but it will be January before I will have the $$ for the build.

Last edited by ddolmyer; 06-24-2008 at 12:50 AM.
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Old 06-24-2008, 01:03 AM   #6
St.race
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You can reuse your block but it will take longer to finish a project and in some cases more expensive. Since your engine is 2007 and 21,000 only i would reuse oil pump, timing belt, water pump and some other staff.
If you would reuse your short block you would need to find a shop that can do it for you. Then you would need at least to replace main and rods bearings. Expect to spend some $ for a machine work and $ for labor to put everything back together.
If you would replace a short block then you would spend less $ for labor, machining and bearings, but remember that short block from Subaru $2000.
What do you use for engine management and how do you tune it?
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Old 06-24-2008, 01:08 AM   #7
ddolmyer
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Protune at a local shop...just reflashed the ECU. With the next step Ill get a Cobb AP
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Old 06-24-2008, 01:14 AM   #8
St.race
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yes do this first

Do you like your FP green with 8cm or you wish for something else?
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Old 06-24-2008, 01:26 AM   #9
ddolmyer
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Quote:
Originally Posted by St.race View Post
yes do this first

Do you like your FP green with 8cm or you wish for something else?
I went with the green because I got a great deal on all the "fix'ns" along with the turbo. I do wish it had more low end power only do to the fact that by the time the turbo kicks in your already movin pretty good. It would be nice to have more low end "umf" and plenty more RPM before it bangs off the REV limiter.
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Old 06-24-2008, 01:38 AM   #10
St.race
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If you had a 7cm you would be hitting full boost a little bit sooner.
Anyway good luck with a car. I hope you would find right combo.
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