91 octane was my biggest concern. One of the guy's from SVTP is running the 3.2" pulley, no chip, and doesn't have detonation. We'll get to see him run on the dyno Feb 1. He said he picked up 25-30 lb/ft trq w/just the pulley and no chip.ox03 said:> Can I get away with the 3.1" pulley? The 3.2" pulley?
Definitely not and probably not. I was at a dyno tune where a 3.1" sans chip was resulting in audible detonation. 91 octane was mentioned as the culprit. Although I cannot speak from experience, I would expect the same from a 3.2".
Beyond A/F the biggest benefit to running a chip is a more aggresive timing curve. I have seen 40 to 100 ft-lbs gained from this mod.GreyCobra_03 said:I am running a 2.93 pulley w/ no chip all last fall, I had no detonation and my A/F numbers looked better than some people's chipped numbers, however I am getting a chip this season because I wanna bypass several features that ford put on our car to give us grief, plus I should gain some HP... right now I am having horrible belt slip but that will change soon