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Thread: How is run9 richer with less inj pulsewidth than run8?

  1. #1
    Senior Tuner
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    Jun 2004
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    How is run9 richer with less inj pulsewidth than run8?

    At first I thought this might be a injector tip temp thing, but the values from 100-135 ITT are all 0s so not that..

    Regulator/fuel pressure not touched between pulls. Just a warmed up pull, then another 15 minutes after no change
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    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

  2. #2
    Tuning Addict
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    As long as you didn't shut if off between pulls, log barometric - guarantee it changed. You have to do the enhanced OS to work around this or only do your fuel adjustments after getting into boost.
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

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