if you go to bazzaz website and find their section that has user maps. There are 2 there that a forum member here put up on bazzaz'z site, I made those maps try the 1 that say 13.5 air fuel ratio. you can load it on your zfi in map 1 or 2, which ever map your tuner did use and compare. even the stock zfi map ran well, just had low ( below 4000rpm) drivabilty hick ups.