Hi all,
I just got my autoprom and noticed that I have a weird spark table for a truck. I have a 91 K2500 with a fresh rebuilt 350 bored .030 over, mercruiser heads(194/155 valves) ported (same casting # as L98 heads), crane 109821
roller cam, edelbrock dual plane intake with transdapt tbi adapter, stock tbi with tbi mods and afpr, K&N open element air cleaner. The ECU is a 1227747
and I noticed that it has a sticker on it that says "remanafactured by GM
authorized replacement". Would this ecu have better code than the stocker? Here is the table:

36.91 36.91 36.91 36.91 36.91 35.86 33.05 31.99 30.94 28.83 28.12 26.02 24.96 23.91 22.85
35.86 35.86 35.86 35.86 35.86 34.10 33.05 31.99 28.12 27.07 26.02 23.91 22.85 22.15 21.09
35.16 35.16 35.16 35.16 35.16 33.05 31.99 28.83 27.07 24.96 23.91 22.85 22.15 21.09 20.04
33.05 33.05 33.05 33.05 33.05 31.99 30.94 28.12 26.02 23.91 22.85 22.15 21.09 20.04 18.98
31.99 31.99 31.99 31.99 31.99 30.94 29.88 28.12 26.02 24.96 22.85 22.15 20.04 18.98 17.93
31.99 31.99 31.99 31.99 31.99 30.94 29.88 28.12 24.96 23.91 22.15 21.09 18.98 17.93 16.87
30.94 30.94 30.94 30.94 30.94 29.88 28.83 27.07 23.91 22.15 21.09 20.04 17.93 16.87 16.17
30.94 30.94 30.94 30.94 30.94 28.83 28.12 26.02 22.85 21.09 20.04 17.93 16.17 15.12 15.12
29.88 29.88 29.88 29.88 29.88 28.12 27.07 24.96 21.09 20.04 17.93 16.17 15.12 14.06 14.06
29.88 29.88 29.88 29.88 29.88 28.12 26.02 23.91 21.09 18.98 16.17 14.06 13.01 11.95 11.95
29.88 29.88 29.88 29.88 29.88 26.02 24.96 22.85 20.04 16.87 15.12 13.01 9.84 9.14 9.14
29.88 29.88 29.88 29.88 29.88 26.02 23.91 20.04 18.98 15.12 13.01 10.90 9.84 9.84 9.84
29.88 29.88 29.88 29.88 29.88 26.02 22.85 18.98 16.17 14.06 11.95 9.84 9.84 9.84 9.84
29.88 29.88 29.88 29.88 29.88 26.02 22.85 18.98 16.17 14.06 11.95 9.84 8.09 7.03 5.98

Any comments or suggestions would be appreciated

 

SA table looks normal. Most likely the replacement ECM has the same code as th stock ECM.

RBob.

 

thanks for checking it out. I tried a different $42 .xdf from the moates site and got different numbers. somebody's calc isn't right, which one does everyone use?

 

That is possible, was the SA difference an even number such as 10 or 20 degrees?

Once thing that TP can do is to subtract the SA bias value for you. If it doesn't then you have to mentally subtract it as you look at the table. Check out the Tuning Guide Book sticky, the section on the 8063/8746/7747 ECM has a SA article in it. Explains the SA calcs and how it comes about in detail.

RBob.

 

Yes it was a fixed amount..... 10 degrees, thanks for the help, I will do more
reading........

 

Take every value on that table and subtract it by 9.81*. That is the actual timing advance you are getting.