Looking for some racing advice.

[SmallHurst]

I am running 13.20's at 103. What am I doing wrong? 105's should be getting him into the 12's.

[Verne_Frantz]

There's no set rule to figure MPH from ET. There are a lot of variables. Generally, it's horsepower that will give you MPH. If the motor is revved past it's HP peak in the gears, it will slow down. If you're not geared to cross the end at your rpm where peak HP is, then mph will suffer, even if the ET is good. ET is "mostly" made up from how good your 60' is.
33 years ago, my '62 ran a 107 with a 13.15et. But with worse tires (period Casler cheaters) it ran 104 but with a 14.45et! The difference was being able to leave at 4800 rather than 2500. The car still made the same HP after it got going, and the small difference in MPH was because it crossed the line about 500rpm lower than before. (I was further down the track when I shifted to 2nd because of starting at a lower rpm.)

Verne