How to calculate your horsepower based on your ET
I been doing research on whether or not their is any actual benefit using the Cold air kits, sold by aftermarket. I'm not easily swayed by advertisement claims of Horsepower gains, by aftermarket, since they are, as we know, in business to make money. I have been using my personal car as a test bed, to prove my point. Based on the formula for horsepower based on ET:
Horsepower = Weight / (ET / 5.825)^3
My car ran a 12.60 with stock air box and tune. On that same day, my friend ran his car, in the next lane with slicks,bone stock and we both 60 footed identically, his best run was 12.81.Race weight for me was 3900 lbs, race weight for my friend was 3830. Both cars are equally equipped, except for the Brembo package which I have, but both cars are automatics with 3.15 gears.
Based on the formula, my car had 386.9 Horsepower to the wheels, and my friends car had 359.6.
Based on this, I have determined I gained 27 HP from tune. This being the case, JLT claims HP gains of 26-30 HP with CAI and tune, and upon me asking them via facebook, they tell me that there can be no gains of more than 15 Hp with just tune. Im inclined to believe , based on my own experience with my car, that there is no gain from CAI with tune, but rather, the gain comes from the tune alone. Anyone else feel they gained more from their aftermarket cold air kit?