Welcome to the North American Subaru Impreza Owners Club Friday December 19, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo)

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 08-24-2014, 12:28 PM   #1
Bgordon1635
Scooby Newbie
 
Member#: 393338
Join Date: Jun 2014
Default Compression test results?

1-110
2-118
3-119
4-118

Car has 163k. Any opinions?
2004 wrx sti 2.5l


Sent from my iPhone using NASIOC
* Registered users of the site do not see these ads.
Bgordon1635 is offline   Reply With Quote
Old 08-24-2014, 12:35 PM   #2
Bgordon1635
Scooby Newbie
 
Member#: 393338
Join Date: Jun 2014
Default

Test was done while car was fully warmed up.


Sent from my iPhone using NASIOC
Bgordon1635 is offline   Reply With Quote
Old 08-24-2014, 01:09 PM   #3
Brother EddieJ.
Scooby Specialist
 
Member#: 181617
Join Date: Jun 2008
Chapter/Region: MAIC
Location: frederick, md
Vehicle:
2004 wrx
6speed/ 330whp/ 300wtq

Default

Those are real low numbers. My buddy has an 05 sti with 80-90k and his numbers are in the 150s. You should start saving for a rebuild.

Next thing you need to do is a leak down and see what % each cyl is leaking.
Brother EddieJ. is offline   Reply With Quote
Old 08-24-2014, 07:35 PM   #4
Bgordon1635
Scooby Newbie
 
Member#: 393338
Join Date: Jun 2014
Default

Okay, thanks I appreciate the opinions. Guess I need to start saving


Sent from my iPhone using NASIOC
Bgordon1635 is offline   Reply With Quote
Old 08-24-2014, 09:12 PM   #5
HinshawWRX
Medium Frank
Moderator
 
Member#: 140114
Join Date: Feb 2007
Chapter/Region: MAIC
Location: Common Sense, VA
Vehicle:
2014 Porsche
GT3 (Currently on Fire)

Default

Dead.
HinshawWRX is offline   Reply With Quote
Old 08-24-2014, 11:26 PM   #6
DrD
Scooby Guru
 
Member#: 22412
Join Date: Aug 2002
Chapter/Region: SWIC
Location: Albuquerque, NM
Vehicle:
2012 Legacy 2.5GT
Ice Silver Metallic

Default

Really helps if you fill out your profile - where are you located? Are you at altitude or sea level? If I measured 110 psi at my house, that would correspond to 131 psi at sea level. (118 would be around 141 psi) Your engine should be around 141-171 psi at sea level, with a max delta of 7psi between cylinders.

Have you done a compression test before? Mistakes in the procedure can yield less than accurate results. Make sure you have the gauge in there snug, the fuel pressure has been vented and fuel pump relay pulled, and all of the spark plugs removed, then crank until you get a stable reading. Make sure you repeat your measurements and that they are consistent.


Altitude Factor
1000 .9711
2000 .9428
3000 .9151
4000 .8881
5000 .8617
6000 .8359
7000 .8106
8000 .7860

how is the car running?
DrD is online now   Reply With Quote
Old 08-27-2014, 11:56 AM   #7
Bgordon1635
Scooby Newbie
 
Member#: 393338
Join Date: Jun 2014
Default

Runs alright and located in middleburg pa 17842. How would it have to do with alritude


Sent from my iPhone using NASIOC
Bgordon1635 is offline   Reply With Quote
Old 08-27-2014, 04:45 PM   #8
WolfPlayer
Scooby Specialist
 
Member#: 65054
Join Date: Jun 2004
Chapter/Region: MAIC
Location: Frederick, MD
Vehicle:
2005 STI (CGM)
Descooped / Dewinged

Default

My 05sti results for comparison. Compression (Leakdown). Performed by me. Motor was warm (not hot). Almost sea level here.

#1: 155psi (6.7% ... 90psi -> 84psi)
#2: 157psi (5.6% ... 90psi -> 85psi)
#3: 156psi (4.4% ... 90psi -> 86psi)
#4: 160psi (3.3% ... 90psi -> 87psi)
WolfPlayer is offline   Reply With Quote
Old 08-27-2014, 04:48 PM   #9
WolfPlayer
Scooby Specialist
 
Member#: 65054
Join Date: Jun 2004
Chapter/Region: MAIC
Location: Frederick, MD
Vehicle:
2005 STI (CGM)
Descooped / Dewinged

Default

Quote:
Originally Posted by Brother EddieJ. View Post
... My buddy has an 05 sti with 80-90k and his numbers are in the 150s ...
lol. I replied to this thread before I even realized you posted.
WolfPlayer is offline   Reply With Quote
Old 08-27-2014, 06:16 PM   #10
Bgordon1635
Scooby Newbie
 
Member#: 393338
Join Date: Jun 2014
Default

Could me just unplugging the injectors instead of pulling the relay out have anything to do with it


Sent from my iPhone using NASIOC
Bgordon1635 is offline   Reply With Quote
Old 08-27-2014, 06:42 PM   #11
BigRob74
Scooby Specialist
 
Member#: 305107
Join Date: Dec 2011
Chapter/Region: Tri-State
Location: Long Island, NY
Vehicle:
2012 wrx
360/386 E85

Default

def seem low mine were pretty much 150 in all 4
BigRob74 is online now   Reply With Quote
Old 08-27-2014, 10:21 PM   #12
DrD
Scooby Guru
 
Member#: 22412
Join Date: Aug 2002
Chapter/Region: SWIC
Location: Albuquerque, NM
Vehicle:
2012 Legacy 2.5GT
Ice Silver Metallic

Default

Quote:
Originally Posted by Bgordon1635 View Post
How would it have to do with altitude
Because the air pressure and density is lower as you go higher in altitude.
DrD is online now   Reply With Quote
Old 08-28-2014, 09:24 PM   #13
nsanteramo
Scooby Newbie
 
Member#: 388743
Join Date: Apr 2014
Default

Seems low. Mine in the 04 are at or around 150. Nice to see an 04 with 160+!
nsanteramo is offline   Reply With Quote
Old 08-30-2014, 11:25 PM   #14
ResidentR
NASIOC Supporter
 
Member#: 281656
Join Date: May 2011
Chapter/Region: MAIC
Location: Centreville, VA
Vehicle:
2001 White Toyota
Sienna

Default

Your compression is fine. As long as they are all close, then you have nothing to worry about. Drive on, and co grass for putting that many miles on one motor.

Sent from my SM-G900V using NASIOC mobile app
ResidentR is offline   Reply With Quote
Old 09-02-2014, 02:51 AM   #15
2012 WRX
Scooby Newbie
 
Member#: 376227
Join Date: Dec 2013
Chapter/Region: MWSOC
Vehicle:
2012 WRX Hatch
Grey

Default

Quote:
Originally Posted by Bgordon1635 View Post
1-110
2-118
3-119
4-118

Car has 163k. Any opinions?
2004 wrx sti 2.5l


Sent from my iPhone using NASIOC

Is your car running well? No CEL's? If so I would suspect your compression gauge is not accurate.
I hooked my compression gauge up to my Craftsman air compressor and my gauge reads a full 20psi lower than the compressor's gauge. And all these years I thought my motors had low compression...
The point is, if it's running good and the numbers are consistent, your probably ok.
2012 WRX is offline   Reply With Quote
Old 09-02-2014, 09:19 PM   #16
turbo05rex
Scooby Newbie
 
Member#: 400394
Join Date: Aug 2014
Default

those are some low numbers i would recomend on starting to put a motor together
turbo05rex is offline   Reply With Quote
Old 09-02-2014, 10:03 PM   #17
Leadfootin
Scooby Newbie
 
Member#: 79441
Join Date: Jan 2005
Default

Leak down the cylinders on a reasonably warm engine otherwise you don't have a clue. Compression is only an indicator if one cylinder is vastly divergent from the rest. Anything over 5% leak should be investigated. Valve leaks can be heard in the intake or exhaust as appropriate. Ring leaks in the crankcase i.e. oil filler. Take a 5% motor down to 1% and the power increase is shocking.
Leadfootin is offline   Reply With Quote
Old 09-03-2014, 11:41 AM   #18
grimnj
Scooby Newbie
 
Member#: 400660
Join Date: Sep 2014
Default

The big problem I see with jumping to a conclusion is that the numbers are consistent, sure you have 163k, but it's rare that you would see that kind of consistency if there was a big problem.

Concur, leak down, and check another car, known good, to get a baseline on the gauges.
grimnj is offline   Reply With Quote
Old 09-04-2014, 10:22 AM   #19
WolfPlayer
Scooby Specialist
 
Member#: 65054
Join Date: Jun 2004
Chapter/Region: MAIC
Location: Frederick, MD
Vehicle:
2005 STI (CGM)
Descooped / Dewinged

Default

Quote:
Originally Posted by Bgordon1635 View Post
Could me just unplugging the injectors instead of pulling the relay out have anything to do with it
Na. But, you don't need to do that. You don't need to pull the relay either. To stop fuel from flowing just press the gas peddle all the way to the floor. This triggers the ECU into clear flood mode and the injectors won't fire. For me, I pull the IGN fuse to stop the ignition and I press the peddle to the floor to stop the injectors from firing. Easy peasy lemon squeezy.
WolfPlayer is offline   Reply With Quote
Old 09-04-2014, 10:57 AM   #20
JimmyBoyWRX
Scooby Specialist
 
Member#: 371081
Join Date: Oct 2013
Chapter/Region: NESIC
Location: CT
Vehicle:
2013 WRX Limited
2006 WRX

Default

Quote:
Originally Posted by WolfPlayer View Post

Na. But, you don't need to do that. You don't need to pull the relay either. To stop fuel from flowing just press the gas peddle all the way to the floor. This triggers the ECU into clear flood mode and the injectors won't fire. For me, I pull the IGN fuse to stop the ignition and I press the peddle to the floor to stop the injectors from firing. Easy peasy lemon squeezy.
IGN relay also disables injectors.
JimmyBoyWRX is offline   Reply With Quote
Old 09-04-2014, 01:53 PM   #21
boost-o-matic
Scooby Specialist
 
Member#: 248364
Join Date: Jun 2010
Chapter/Region: SCIC
Location: SoCal
Vehicle:
2010 WRX 427hp/437tq
Dom 1.5XTR E85 silver

Default

Toast...sell it to some unsuspecting fool. =P
boost-o-matic is offline   Reply With Quote
Old 09-04-2014, 01:57 PM   #22
boost-o-matic
Scooby Specialist
 
Member#: 248364
Join Date: Jun 2010
Chapter/Region: SCIC
Location: SoCal
Vehicle:
2010 WRX 427hp/437tq
Dom 1.5XTR E85 silver

Default

The rule of thumb is no more than 10% diff between cylinders, so you're fine there. 150-180 is normal range. You're definitely low, and losing some performance, but car could keep going ok. I would spend any money on mods though. Lesson learned, don't keep a car this long. A subie with 163k miles is a hot potato. Don't be left holding it when the buzzer goes off! That goes for any high mileage car really...just that these typically don't have much life past 150k from what I see on here.
boost-o-matic is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 09:18 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.