Truck falls flat after 3000 rpm.

[mmigacz]

Im going to try out the ASDU bin and see how that goes. I was tuning ve before by combining table 1 and table 2. I know its user preference but i thought i read something about leaving some values in table 2 because some other table or something looks at table 2 and if its zeroed out it cant read it, idk. Can i still tune using daves excel spreadsheet by just using ve table 1 and leaving table 2 alone. Also why does ve table 2 go up to 6400 rpm when ve table 1 only goes up to 3200 rpm? Thanks for everyones help so far.

I'm not sure why GM set the 7747 up this way. It would make more sense to have one VE table that goes up to 6400RPM.....I'm not sure if I understand your question, but you can 0 out the adder table. The ECM will use the values from the VE1 main table 3200 row for all RPM's higher than 3200. If you need to richen things up after 3200RPM, you can use the cells in the adder table (3600-6400) to richen up the mixture at higher RPMs.