91 or 93 Tune?

[billy_the_kid]

I currently own 2006 Mustang GT, Auto, with 3.73 gears, Steeda CAI and SCT X3. I was wondering if their is any difference in hp or performance difference between the 91 and 93 tune?

 

[psycho bob]

will be minimal at best, but you want to use the tune for whichever octane gas you have in your area.

 

[W1ldcat]

If you have 93 in your area go 93 and if you travel and have to put 91 just don't run it as hard to be safe.

 

[DKO]

My tuner hooked up his diagnostic machine and checked what timing I was running with my 91 tune (I used to live in California) and told me what he had been running on local cars with a 93 tune and the difference was substantial. I don't have dyno or track results yet, but he said my BamaChips tune was pretty conservative on the 91. Apparently with the decent South Carolina gas I could push 7-8 degrees more timing and pick up 10whp if not a little more.

Just something to consider, but definitely stick to the fuel type that's available in your area.

 

[SteveP]

Tune it to the area you live in. When I had my 01 cobra in cali it was from factory tuned for 91 and when i moved to mass i could only use 93 which it did nothing but once i tuned it for 93 it felt much smoother.