i took my 97z28 to the dyno and it made 241hp and 281tq then i put pasesetter LT, pasesetter y pip , ngktr55 plugs , tyler 8.5 wires ,got a madz28 tune then i had it dyno agen and then i made 256hp and 283tq my a/f was 11.6 can any one tell me what happed of the top of there head if so let me know thank you

 

AFR of 11.6 is way too rich for a normally aspirated engine. Talk to MadZ28 about the tune.

 

wow 11.6?? Mine was 13.1. Yea yours is waaay too rich. I'm guessing you have a sensor bad somewhere or something cuz i doubt he'd mess up your tune that bad ya know?

 

before the tune the a/f was not reading when i was geting it dynoed it droped down blow 9 after the tune it was 11.6

 

right now im geting about 12mpg