Timing changes vs Temperature?

[Jarren_b]

I was wondering if its possible to change timing vs IAT and RPM?

Due to the summer heat ive had to take a degree or two of timing out of my car in some spots. We had a few cold days here so for curiosity I added the original timing back in to see if it would take it and it did no problem.

I have been looking at the IAT vs spark table but If I had a 1 or 2 where I want it, it will add timing across the whole rpm range at that cylinder fill. I only need to add timing at certain IAT, cylinder fill and RPM because I didnt need to pull timing everywhere, just in a few spots.

Is there a way to do this?

[schpenxel]

There's the IAT base spark table you've looked at already.. and there's also a multiplier table that's by RPM and another by engine coolant temp. It takes the value in the base table x RPM multiplier x ECT multiplier to come up with an "IAT Timing Advance" value

I don't have a good way to help you set it up--but I think between the three tables you can make it do what you want.