This is a short sand course The traps somewhere around 1 to 1.5 miles from the start, is my best guess. A conversation with an experienced racer tells me to pay attention to the fuel vaporization curve. There are two gasolines I tested. One is Sunoco Supreme, with 10% evap at 169 degrees, 50% at 217, and 90% at 231.
The other is Sunoco MO2X leaded, with 10% evap at 124 degrees, 50% at 207, and 90% at 226.
Another gas is Sunoco SR18. It has almost identical stoichometric ratio to Supreme. I should be able to use it with the timing curve and jetting for Supreme. Its evap curve is 10% at 166 degrees, 50% at 209, and 90% at 213.
All of these fuels have plenty of octane. My engine will be on the cool side during most of these runs. It will not have time to get real hot. My feeling is the SR18 should be what I use since more of it vaporizes at lower temps. What do you'all think about this? I also asked Sunoco and they have not had the time to reply. It does not hurt to have more than one opinion.