Need advice on Compression #'s - Subaru WRX Forum
 
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post #1 of 5 Old 04-02-2013, 03:32 PM Thread Starter
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Need advice on Compression #'s

I am looking to purchase an 05 STi with 52,000 miles on it. It has Cobb stage 2 (turbo back exhaust with access port tune.
I had a Subaru mechanic check the compression (wet and dry) as well as Leak Down Test done. I am not sure if I should be "concerned" about the compression results or not? They are as follows:
126, 125, 126, 126 psi (prestty much the same wet and dry)
Leak down test results as follows:
6, 7, 7, 8%

Is there are any call for concern regarding the compression numbers? The mechanic said they are lower than spec, but the car has a tune and that could affect the numbers and he said the more important thing is the consistency between cylinders.

Opinions?

Thanks A LOT!!

Joe
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post #2 of 5 Old 04-02-2013, 04:01 PM
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A tune is not going to affect compression numbers. Those are pretty low. You want 140s. It might be his gauge though.
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post #3 of 5 Old 04-02-2013, 04:49 PM
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My car measured about the same a good 20k miles ago (which is like 4 years ago for me). Don't flip out about it, those numbers are reasonable. Is it costing you some performance? Probably a little. I agree with your tuner and brfatal's assessments both. You're looking at an 8 year old car, expect some degradation.

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post #4 of 5 Old 04-02-2013, 06:52 PM Thread Starter
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Thanks for the advice. I am going to pull the act on it
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post #5 of 5 Old 04-22-2013, 08:54 PM
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Quote:
Originally Posted by createaneutron View Post
Thanks for the advice. I am going to pull the act on it
Good call. Just bought a blue '04 WRX myself, and am drooling at the thought of a COBB Stage 2 Power Pack, that you are getting with your purchase. Nice!

Take some pictures, and show us what it looks like when you get the chance.

Laszlo - blue '04 WRX
Meet the turbocharged rally-bred Subaru WRX.
blue '09 STi - lease return
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