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Old 01-30-2013, 10:33 PM   #1
TXSoobieNoobie
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Default 2.0L WRX 04 Compression Test...Low Numbers

So Im looking at buying a car and I took it in for a compression test before I bought it.

The car has just under 80k miles and looks to have been pretty well taken care of, but from reading around, almost everyone has compression numbers around 145-150

My numbers were 133, 134, 136 and 138.

I really like the car and the price is right, so I want to pull the trigger, but I dont want to make a mistake.

My tuner said it needed a tune (TBE, STI Uppipe, CAI) as it was running a little rough, but otherwise he gave it the thumbs up.

I know this is still within the service range, but should i take this as a sign the car isnt running as well as I thought or am I worrying too much?

Thanks.
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Old 01-31-2013, 01:34 AM   #2
04ScoobyWtf
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If you trust your tuner then pull the trigger

1. Tuner
2. Internet
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Old 01-31-2013, 01:35 AM   #3
mod maniac
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I don't like that the car is running rough but the numbers are close enough. I would also do a leak down.
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Old 01-31-2013, 08:40 AM   #4
cmiovino
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My concern would be how long it's been running with those parts and no tune.
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Old 01-31-2013, 08:49 AM   #5
shano
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Ditto on the above comment.


Although you may be able to use that as a "price negotiator" and score a really good deal and it may turn out alright. Worst comes to worst.... stroker/twin scroll/avcs build?
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Old 01-31-2013, 09:03 AM   #6
04wrxhart
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If it's running a tbe and cai untuned, I more then likely would run from this deal. The 04+ models have to be tuned with those upgrades. Earlier years can get away with it.
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Old 01-31-2013, 10:40 PM   #7
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As far as the compression numbers, as long as they are above 125 or so and are grouped close together you should be fine.

You do need to get it tuned for sure.
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Old 01-31-2013, 10:45 PM   #8
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thanks for the help everyone

decided to pull the trigger on the deal and just "drive it like a grandma" until I can get it tuned. will post before/after dynos.

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Old 04-22-2013, 11:49 PM   #9
TXSoobieNoobie
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Motor blew.

So much for that.
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Old 04-23-2013, 12:22 AM   #10
corvallisbattery
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Really!? What happened??
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Old 04-23-2013, 01:44 AM   #11
mod maniac
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Two months no tune?

Last edited by mod maniac; 04-23-2013 at 03:13 AM.
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Old 04-23-2013, 08:20 PM   #12
TXSoobieNoobie
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Clutch started slipping on dyno. Car went down for that. Then once I had about 500 miles on it, I took it in to get tuned. Made like 210/230 or something like that. Car blew on the way to work from getting it tuned March 7th and has been sitting since.
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Old 04-23-2013, 08:22 PM   #13
art@grimmspeed
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Sorry to hear that. Judging from the numbers it was not very healthy for the tune. Surprised the tuner did not notice anything
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Old 04-23-2013, 08:24 PM   #14
2gnt2wrx
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Quote:
Originally Posted by TXSoobieNoobie
Clutch started slipping on dyno. Car went down for that. Then once I had about 500 miles on it, I took it in to get tuned. Made like 210/230 or something like that. Car blew on the way to work from getting it tuned March 7th and has been sitting since.
What about it blew? Spun bearing, piston, timing belt skip?

Last edited by 2gnt2wrx; 04-23-2013 at 08:52 PM.
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Old 04-23-2013, 08:56 PM   #15
TXSoobieNoobie
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Those numbers are too far off from what many similar setups dyno'd. It was around 198/210 on the basemap.

Spun bearing.

Last edited by TXSoobieNoobie; 04-23-2013 at 09:18 PM.
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