howdy,im about to get my 97,s7,13btt,fd dyno tuned and was wanting to know what air/fuel/ratios i should have,the engine has slight mods,sequential twins,arc airbox,apexi pfc,mapped for these mods, standard intercooler<for now>,downpipe with hi flow cat and 3inch kakimoto exhaust to a large muffler,any help would be great.

 

Very generally speaking:

Around 13-13.5 at idle.

15.5 at cruise.

14.5 at light load.

13.8 at moderate acelleration under atmospheric.

12.0 at low (about 4 PSI) boost

11.5 until about 15 PSI.

High 10s or flat 11s at higher boost.

 

thanks for that,its going to be driven hard around the odd track or two.