Originally posted by MapOfTaziF�?³sh�?³:
If you've done enough mods to lean out the air/fuel ratio...higher octane would help. I usually run 89 in my car...it runs considerably better on 91.


That's just not true.

It is ignition timing and compression ratio that are the major factors in dictating octane requirements. Octane does not equal power it equals resistance to detonation.


Also there is no amount of bolt on mods you are going to do that makes the stock A/F tuning lean. With the exception of something that alters the MAF signal/function.

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.