An important element in the dyno tuning of 2005 Mustang GT is heat. The 05 Mustang GT is extremely heat sensitive. This is the reason we prefer CAI systems that shroud the filter to prevent heat soaked IAT, this makes a HUGE difference on the street. We dyno all vehicles hood down with a fan system that generates 60+ MPH air flow to the vehicle.
Another important point here is you said “7th pull” was 13.1 A/F. That’s quite a few pulls, how many pulls are made, and the length of time between pulls can be an important factor in how you analyze the data, again heat is the key.
We find an A/F of 12-12.5 seems to be best in our testing; we use 93 octane fuels and are running a loadable chassis dyno. Different A/F sensors can vary, as can dyno’s.
DiabloSport engineers running the vehicle at 98% load makes a big difference, remember static pulls, no load, do not allow the vehicle to look at the proper WOT load tables. Running WOT at 60% load, instead of 98% load, is looking at calibration data quite different then what the vehicle sees on the street. Dyno software can compensate to some extent on power numbers, but this is why you see a different, but more accurate, power and A/F number out of loadable dyno runs.
Thanks,
Nick Spinelli
DiabloSport Sales Manager
[email protected]