stock tune changes for 91 octane

[GP-SE]

hey guys, if I modify my stock tune, how much timing should i have at WOT for 91 octane?
I tried the canned 93 octane tune, but my fuel economy sucks with it.
What should the timing be at WOT with 91 ethanol free octane?

[bcarbon]

hey guys, if I modify my stock tune, how much timing should i have at WOT for 91 octane?
I tried the canned 93 octane tune, but my fuel economy sucks with it.
What should the timing be at WOT with 91 ethanol free octane?

You're going to have to datalog and check your knock events. Start by pulling a few degrees then logging a pass to see how it reacts.

[mikel]

mileage is going to be the same from the 91 to the 93 tune...WOT spark is the ONLY difference between the 2, and thats not affecting your mileage.

[GP-SE]

I only have 3 tune choices:
stock
87 octane diablo
93 octane predator tune
I get the best mileage out've the stock tune, so I wanted to see how much timing I should have at WOT with 91 octane.

[mikel]

about 1-2* less than the 93 tune...but again, WOT spark has NOTHING to do with mileage...

[GP-SE]

that's true, I was thinking maybe the A\F ratio at cruise, or power enrichment might be a little more rich than stock. Regardless I'm getting about 19* of timing in 1st gear, 24* or so in 2nd gear at WOT (auto).
Cruise is around 35-40*
This is with the 93 octane tune, stock I was getting about 14* at WOT, cruise the same.