Thread: Street Mod.
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Old 09-21-2017, 10:26 PM   #32
Scooby Newbie
Member#: 221439
Join Date: Aug 2009
Chapter/Region: E. Canada
Location: Quebec, Canada
2004 STI


Brainstorming on engine for next year. After 4 years it's time to rebuild mine and I'm debating between 2.35 and 2.5.

Option 1 = 2.5 + 07+ gearing. Pretty standard setup.

Option 2 = 2.35 with 04-06 gearing and ~9k redline. 2nd gear is about 6% shorter than 07. If you can rev 6%+ faster than the 2.5, you have an advantage on top speed before shifting. Then you get 6% more wheel torque, so even if the engine produces a bit less torque, still end up similar acceleration. Engine spool later in RPM, but you get 6% advantage in actual speed at which the turbo will spool. You can remove 50-60 lbs from the car. Bonus you get to use all your cluster RPM range and less chances to break drivetrain

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