Does anyone know the formula to calculate 1/4 mile time, not a website which has two inputs weight and horsepower which gives estimated 1/4 mile time, but I want the actual formula. thanks in advance.

 

Check out NHRA's website .. They may have it.. I know thats where ya go to get correction factors and formulas..

 

here is one ET = (weight/hp)0.2841 x 6.9446

 

here is another ET = (weight/hp)1/3 x 6.269

 

Here is the most accurate one I`ve found to date

http://www.centralcoaststangs.com/features/hp_calc.php

 

hp being crank or rwhp?

 

HAHAHAHAH
it said: Your car makes
359
Horsepower!

Thats almost spot on! haha
thats funny!

 

here is a very informative site on hp/et/weight formulas
http://www.stealth316.com/2-calc-hp-et-mph.htm

 

Dragstrips do a pretty good job. :P

 

I tried those and based on some, they say I make over 375 at the crank! haha
NOT!

 

Well the only way to calculate ET or MPH is to know the weight and hp since ET and mph are calculated from a power to weight ratio. Knowing the car's race weight, car with driver fuel etc, and the ET/MPH it runs in the 1/4, you can calculate how much HP it took to go that fast.

MPH is a better indication of hp since ET depends on traction. If you hook up or spin off the line, mph will stay roughly the same but ET will suffer when you spin.

If you want a formula to "predict" an ET, that's something different. Spend the money on a PerforAIRE or Tag system to do ET predictions. The formulas needed are not very simple plus need accurate weather data to give accurate predictions.

Read this thread
http://web.camaross.com/forums/showthread.php?t=291819