I noticed in the ANHT.bin that it has Spark Advance entries
as high as 48.2, but the Constants has a max Spark Adv. of 41.8.

So I guess in the ANHT.bin you will never see the Spark Adv
Higher than 41.8, if thats so then why for the High entries upto
48.2 for Spark Adv. in the Tables.

Dose the Highway Mode Spark Adv. ignore the Max setting in the Constants?

 

The min/max SA terms are defined by the physical limits of the distributor. By offsetting the distributor 6 degrees advanced the max SA at the crank is increased by 6 degrees over the max SA term in the ECM. And, the max retard at the crank is decreased by 6 degrees.

Nothing bypasses the min/max SA terms.

RBob.

 

Rbob,
My question was probably confusing.

My question is Why dose the ANHT.bin have entries in the
Spark adv. tables greater than the Max spark adv. setting
in the Constants.

If the Max Spark Adv. in the Constants is set at 41.8
why are there entries in the Main Spark Adv. table of 48.2.

 

I understood. With a Max Advance of 42° and an initial of 6° the max crank timing is 48°. The ECM knows that the initial is set to 6° and takes it into account. The .2° extra is because of how the math works and will be clipped.

RBob.

 

OK that make sense now, I finally got it thru my thick head.

Thanks

Louis