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  1. #41
    overboost's Avatar
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    I'm seeing 13 psi at 8500/8600 with the Maptunerx logger/PLX. You may get different results from other loggers......

    is this common with 137+4, or do you have cam or head porting or something to make engine breathe better?

  2. #42

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    Quote Originally Posted by overboost View Post


    is this common with 137+4, or do you have cam or head porting or something to make engine breathe better?
    Nothing else done, you'll probably open e a can of worms should you go further. Though my valves are 6 grams lighter each, supertech springs and titanium retainers, I don't spin it more then 8650. You'll probably get 15 psi at closer to 8900-9000 Rpms. My crankshaft was bent and straightened by my machinist during the rebuild. Spinning it higher then stock rated rpms can cause this.


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