If I just mix race gas with 93 octane gas will this increase hp and tq and get better 1/4 time or do I have to also play with the AFC to get a good change. Don't want to start making changes to the AFC at the track without a wideband 02.

thks

 

you can run more boost safely, however i wouldn't go tuning without a wideband or a sniffer on a dyno