How close are they to your real hp number. I ran 15.7 at 91mph.
The one that uses trap speed says i have 327 at the wheels. The one
that uses ET says 271 at the wheels. Why are they so different?

 

Alot can affect your et time but you will generally run close to the same mph every time. I have a time slip for a 17.2 sec pass and a 13.5 sec pass both on the same night with only 1 mph difference so go with your mph IMO.

 

A few things can effect your et or trap speed, and indicate that you have less hp than you actually do. But, I don't think anything will indicate more. Go with the higher number, but it's still just an estimate. Remember, torque is an actual measurement, hp is just a number.

 

Thanks for the replies