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I'm in Florida and it get's brutal hot and humid here in the summer. I punched in some conservative numbers for an average summer day and came up with about a 10% difference in actual air density.
I have a Vinci tuner and I'm running the Hi Perf/stock cam tune with 10% timing advance (about 3*), which seems to be the best for my set up. (Tested by seat of the pants and by driving my standard fuel economy test loop.)
Here's my question, with 10% less air density for months at a time in the summer, do you think it would be safe to cut 5 or 10% off the fuel during the summer?
I have a 00 FRC with BBK shorties, flowmasters, and a K&N with cut box.
You need to find someone with scan software and scan a 20 mile run, This is the only way you will know what is happening. By making changes "by guess and by friends" causes more problems than they help. With the scan, you will know exactly what to look for and if you can change the condition. Only drawback is the limitations of handhelds.