i tuned my car with ls1edit a week ago and put down 377 w/11.5af ratio NA and 483hp w/11-10.5af ratio on 100 shot. i had some other runs of the scale even rich running rich on almost all runs but my plugs where really black fouled up so i changed them the other noght now..

as soon as i started the car it changed my idle and i dynoed today using the same tunes as above 3runs first 2 na 356hp and 363hp w/14.5af ratio and 458hp w/14.5af ratio 100shot

the only thing changed is plugs and af has gone from 11-11.5 to 14.5 any thoughts i dont have a scanner so cant post graphs

 

both plugs were tr6's gapped .35 and 101 octane both times

 

do you really need that high of an octane? what kind of compression are you running? stock? you shouldn't need anything over a 93 octane if on stock compression and really won't see gains from the higher octane. You'll be looking at fouled plugs, O2 sensors and cats with that high octane.

I'm not sure of the drastic change in A/F though.

 

just to be safe with the n2o

 

Fouled plugs would cause a difference in a dyno run, you went from running rich on your first dyno to running really lean , I would play with the edit and get your airfuel close to 12.5 and see what your power is then. I would not run race it with that Airfuel that is dangerous.

 

i agree im really glad i dint have problems on the dyno w/100 shot at 14.5