91 per. tune with 87 gas.

[gmantheman]

I have an 06 Mustang GT. I remember reading in another thread that some one used the 91 tune with 87 gas and reduced the global spark by 4. Is there any benefit with doing this?

[gmantheman]

I tried the experiment. I have 87 octane gas. I installed 91 per. tune and reduced the spark by 4. I didn't notice any pinging, although I only took it for a short drive. I didn't notice any performance benefits, so I switched back to the 87 tune and set the spark back to 0

[edamon]

I have an 06 Mustang GT. I remember reading in another thread that some one used the 91 tune with 87 gas and reduced the global spark by 4. Is there any benefit with doing this?

I'm running the 91 octane tune with +2 global advance, +.5 fuel on 89 octane with no pinging - audible at least.

Looking at a few data logs everything seems fine. Going to keep playing around with it and see what I can get out of 89 octane.

For what it's worth, it's unocal 76 gas in CA.

-d

[gmantheman]

I am new to tuning, so I may be wrong, but if you are using a 91 tune with 89 octane, shouldn't you do -2 global spark. Isn't advancing the global spark by 2 w/91 tune for 93 octane gas?

[mikel]

Benefit to doing this, no, other than giving up most of the power gained from the tune...

Thanks