compression results, is this tired like soon, or can it go longer?

KB'izzle · 09-30-2009, 08:06 PM

just finally did a compression test on my 04 sti, Ive been running a perrin rotated 30r turbo kit for about 25k miles, put the kit on when the car had 25k miles mid last year, now after a few accidents, 1 being a roll over on the driver side, & using the POWER every once in a while, I have a feeling the stock motor is getting there, I am burning a good amount of oil along w/ when I get on it alot of smoke shoots out the exhaust, only used race gas/ w/ that map about 10 times, if that, maybe less, 24psi at first then more recently 27psi, ive hit 127 in the 1/4, and got a 11.2, along w/ road racing it at willow 7 times, other then that always pump gas & usually always conservative, altho I do have a 400whp 91 oct map I use on occasion to play w/ a Z06, here are the results

I did a check shortly after I bought the car & put the 30r on this is what it was w/ 27k miles about 7/08

windshield

133 ----------------128 drivers side

pass side139 ---------------- 130

front end

now w/ 50k miles as of today, same way layed out as above

129 -----------128

125-------------115

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2gnt2wrx · 09-30-2009, 09:22 PM

Your numbers are "soso" keep an eye on cyl3. Thats the same cylinder that started to go on my engine. It's probably the begining stages of a cracked ringland. To really get a better picture of whats going on get a leakdown performed.

LiquidForce · 09-30-2009, 10:34 PM

Were the test done with the same gauge?

If so 1 and 2 have a pretty significant drop (~15psi) from the last test.

If you don't push the car you may make it a while but with a 30r on there I know I wouldn't be able to stay off the throttle

If I were you I'd take it off the road now and rebuild it before something happens and you mess up the cylinders too much to rebuild.

KB'izzle · 10-01-2009, 05:40 PM

I used the same gauge both times, those first results were about 2 months & 2-3k miles after I put on the turbo kit, & it was on the dyno getting tuned w/ both pump & race already, 1st set of maps were, 19 psi 91 oct made 340whp, the 110 or c-16 map was 24psi made 425whp, next maps not sure what the dd map's psi was set at, but %99 of the time I drive w/ about 370whp (I'm guessing at like 21), the 400 91oct map was on 23psi,

just put an acpt cf driveshaft on late last night, you think this help be easier on my motor? so I can make it last longer to save up? I've honestly been barely on it few the last few months & plan to keep it that way for a while.

I'll make up for it in track time, once I finally get my motor & broken in, hopefully sometime early-mid next year

09-30-2009, 08:06 PM	#1
KB'izzle Scooby Specialist Member#: 169955 Join Date: Jan 2008 Chapter/Region: SCIC Location: Anaheim,CAsoon2bYIMI'd11.2/127 Vehicle: AREA P/ ALLIANCE FAB 30r 04STI tdo4'n wg psi	compression results, is this tired like soon, or can it go longer? just finally did a compression test on my 04 sti, Ive been running a perrin rotated 30r turbo kit for about 25k miles, put the kit on when the car had 25k miles mid last year, now after a few accidents, 1 being a roll over on the driver side, & using the POWER every once in a while, I have a feeling the stock motor is getting there, I am burning a good amount of oil along w/ when I get on it alot of smoke shoots out the exhaust, only used race gas/ w/ that map about 10 times, if that, maybe less, 24psi at first then more recently 27psi, ive hit 127 in the 1/4, and got a 11.2, along w/ road racing it at willow 7 times, other then that always pump gas & usually always conservative, altho I do have a 400whp 91 oct map I use on occasion to play w/ a Z06, here are the results I did a check shortly after I bought the car & put the 30r on this is what it was w/ 27k miles about 7/08 windshield 133 ----------------128 drivers side pass side139 ---------------- 130 front end now w/ 50k miles as of today, same way layed out as above 129 -----------128 125-------------115 * Registered users of the site do not see these ads.

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09-30-2009, 09:22 PM	#2
2gnt2wrx Scooby Specialist Member#: 123625 Join Date: Aug 2006 Chapter/Region: MWSOC Location: 381whp/332ftlbs @19.5psi Vehicle: 2006 sti ATP35 tuned by Jorge	Your numbers are "soso" keep an eye on cyl3. Thats the same cylinder that started to go on my engine. It's probably the begining stages of a cracked ringland. To really get a better picture of whats going on get a leakdown performed.

09-30-2009, 10:34 PM	#3
LiquidForce Scooby Specialist Member#: 12811 Join Date: Nov 2001 Chapter/Region: South East Location: Roswell Ga Vehicle: 2002 2.5l Wrx 517whp/516wtq (Stage pi)	Were the test done with the same gauge? If so 1 and 2 have a pretty significant drop (~15psi) from the last test. If you don't push the car you may make it a while but with a 30r on there I know I wouldn't be able to stay off the throttle If I were you I'd take it off the road now and rebuild it before something happens and you mess up the cylinders too much to rebuild.

10-01-2009, 05:40 PM	#4
KB'izzle Scooby Specialist Member#: 169955 Join Date: Jan 2008 Chapter/Region: SCIC Location: Anaheim,CAsoon2bYIMI'd11.2/127 Vehicle: AREA P/ ALLIANCE FAB 30r 04STI tdo4'n wg psi	I used the same gauge both times, those first results were about 2 months & 2-3k miles after I put on the turbo kit, & it was on the dyno getting tuned w/ both pump & race already, 1st set of maps were, 19 psi 91 oct made 340whp, the 110 or c-16 map was 24psi made 425whp, next maps not sure what the dd map's psi was set at, but %99 of the time I drive w/ about 370whp (I'm guessing at like 21), the 400 91oct map was on 23psi, just put an acpt cf driveshaft on late last night, you think this help be easier on my motor? so I can make it last longer to save up? I've honestly been barely on it few the last few months & plan to keep it that way for a while. I'll make up for it in track time, once I finally get my motor & broken in, hopefully sometime early-mid next year