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Thread: Boosted LT1 7 psi, what kind of timing? Knock retard all the sudden wasnt doing befor

  1. #1
    Senior Tuner
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    Jun 2004
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    Baltimore, Md
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    Boosted LT1 7 psi, what kind of timing? Knock retard all the sudden wasnt doing befor

    Made 15 pulls on dyno wasnt pulling timing like this, afterwards on the street either. All the sudden couple months later, constant KR at wot (cant hear it but car is loud)

    Similar Inj DC, MAF Hz reading as it had, havent got chance to get on dyno yet. pulls bunch of KR even mid throttle near atmospheric pressure
    Attached Files Attached Files
    Factory Stock 97 SS M6 13.51 @ 104.3 mph
    Stock Longblock LS1 w/ 233/238 P.S.I. Cam
    10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago

    '99 TA trunk mounted 76mm 6 Liter
    9.0s in '09 @ 153 MPH

    Turbo 5.3 Volvo 740 Wagon
    32psi and still winding out 5th on the highway somewhere