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Thread: Injectors or fuel filter?

  1. #1
    Member Ritch's Avatar
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    Feb 2007
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    Default Injectors or fuel filter?

    Here's the tune on my 99 5.3 truck with stock intake and exhaust manifolds. Notice VE table over 100% after tuning with an LC-1. Are the original injectors so weak that they can't keep up with this flat cam? (stock) I have 2.5" pipes off the manifolds into a 3.5" collector and then 3" to the bumper. No cats. I quite sure the filter is good because my fuel pressure was steady at 58psi
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    ____________________________
    1999 GMC, rcsb, 2wd, 5.3, XR275HR-12
    Radix magnacharger mp112
    Long tubes true duals, $L60E

  2. #2
    Joe (Moderator) joecar's Avatar
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    Default

    Ritch,

    In tunetool properties, change the VE table units to g*K/kPa, and forget about %...

    g*K/kPa are "normalized" units with no reference to static volume at at some given temperature (which is always different/varying than your running conditions)... you should be doing AutoVE using g*K/kPa.

    g*K/kPa shows that the VE table does not give "VE" but it gives airmass normalized for pressure/temperature.

    Oh, also be sure to set fueling units to AFR or EQ and not Lambda.

    Cheers,
    Joe

  3. #3
    Member Ritch's Avatar
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    Feb 2007
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    Default

    ____________________________
    1999 GMC, rcsb, 2wd, 5.3, XR275HR-12
    Radix magnacharger mp112
    Long tubes true duals, $L60E

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