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  1. #1
    Join Date
    Apr 2016
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    S15 SR20DET BlackTop Compression Results

    Hey guys! This is one of my first posts here but I really needed some clear answers. Have tried googling but everyone seems to have red-tops for this.

    Anyway, I was about to dump some money into my car (front mount, cams, ecu, injectors etc) but decided to do a compression test first to make sure everything was good.

    The car has done 95,000kms (both body and original motor). However my compression results have slightly worried me as they seem to be seriously low.

    Cylinder 1: 122PSI
    Cylinder 2: 121PSI
    Cylinder 3: 119PSI
    Cylinder 4: 119PSI

    This was done on a hot motor (driven around for around 30 minutes then tested straight away) with the throttle fully open. They are next to perfectly even across the board but am just concerned with how low they are. The car drives perfectly, does not feel sluggish, no hesitation on boost, doesn't burn oil etc. Just has me a bit concerned now is all.

    What do you guys think?

  2. #2
    Join Date
    Nov 2007
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    I would be more happy if I saw 135 to 140 on a motor of that milage

  3. #3
    Join Date
    Nov 2012
    Location
    Edinburgh
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    Do you have a boost gauge fitted?
    What vacuum does it read at idle?

  4. #4
    Join Date
    Aug 2011
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    Last comp test I did on an sr was 140 on all 4 cold. That had done over 100k miles.

  5. #5
    Join Date
    Aug 2013
    Location
    Devon
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    This is mine from a 40k mike stock block with Poncams Iíve just sold.

    Yours is quite low.

    Did you open your throttle body when cranking? Having the TB closed starves the cylinders a little.

    Do the same test whilst keeping the TB open.

  6. #6
    Join Date
    Aug 2013
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    Devon
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    Apologies . Just seen you have had TB open.

  7. #7
    Join Date
    Nov 2007
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    Maybe try another Comp tester..

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