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createaneutron 04-02-2013 02:32 PM

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.


Thanks A LOT!!


brfatal 04-02-2013 03:01 PM

A tune is not going to affect compression numbers. Those are pretty low. You want 140s. It might be his gauge though.

mosc 04-02-2013 03:49 PM

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.

createaneutron 04-02-2013 05:52 PM

Thanks for the advice. I am going to pull the act on it!Thumbs Up

LW_Black4 04-22-2013 07:54 PM

[quote=createaneutron;292438]Thanks for the advice. I am going to pull the act on it!Thumbs Up[/quote]

Good call. Just bought a blue '04 WRX myself, and [B]am drooling at the thought of a COBB Stage 2 Power Pack[/B], that you are getting with your purchase. Nice!

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

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