12200411 Timing Advance Impass Reached

[Caleditor]

Stock 2001 5.7L 1 ton van

[EagleMark]

With the L31 Vortec your kind of stuck with limitations of distributor at 45* Which is not an issue with 4.8,5.3 COP systems.

Why you can only get 34.5 in that are looks to be a "Mean Best Timing Spark Advance" Setting?

[Fast355]

With the L31 Vortec your kind of stuck with limitations of distributor at 45* Which is not an issue with 4.8,5.3 COP systems.

Why you can only get 34.5 in that are looks to be a "Mean Best Timing Spark Advance" Setting?

Values are set at 45° in that area on that table, 45° in the High and Low octane tables. IAT/CTS compensations are -2° and there is zero active knock retard and I always disable burst knock.

[Fast355]

Stock 2001 5.7L 1 ton van

Thanks for the graphic. I am running th 2002 operating system with a 1500 calibration and I am thinking it may be different.

[Fast355]

Here are the values and ranges I am operating in cruising on flat land.

[Caleditor]

02 are the same

I remember something Ed Wright posted about timing limits on 4.3L.

I can tell you that the MBT table has nothing to do with it. I think the OS has another setting for HVS system

[Fast355]

02 are the same

I remember something Ed Wright posted about timing limits on 4.3L.

I can tell you that the MBT table has nothing to do with it. I think the OS has another setting for HVS system

Never heard of HVS before. Its also definately a 5.7 calibration. The 4.3 can take more advance because the spacing is wider.

[Caleditor]

high voltage switch (HVS)

The type of ignition system

[Fast355]

high voltage switch (HVS)

The type of ignition system

Oh that makes sense, just never heard it refered to as that is all.