There is a local engine builder here in Amarillo that specializes in drag racing. He has a dyno (superflow) that they have been running some 4 wheelers on, a few raptors, 700xx, and a bunch of banshees. I only have my knobbys to use which will hold me back a little i guess. What AF ratio should i look for? Ive seen people say 13.1 to 13.5 across the board, Is that right? Im still working with a dobeck style controller which at the moment is running rich down low and mid range and lean up top. Atleast thats what the plug looks like. I just went to the 11.1 CP an trying to get it running as good as possible with what i got. I also got an iridium plug(CR8EIX) to try back to back with a regular ngk (CR8E). They suggested mixing some race gas but i shouldnt need it with my setup but i may try. Their giving me an 1 1/2 hour and or 3 to 4 pulls for $90. Any tips would be greatly appreciated.