First off I did several searchs to see if I cuold find it but i couldn't. What is the formula to figure out how much HP I'll need to run xSec. in teh 1/4? Thanks

 

Not that I'm the pinnacle of car knowledge or anything, but I've never heard of such an equation. Your speed in the 1/4 depends on more than just HP. It depends on what your powerband is, where you shift gears, your response time, the weight of the car, etc etc etc etc. To really get a good idea of where you're headed, you'll need to get some software like Desktop Dyno and enter in as much information you can about the parts in your car. It'll give you a rough estimate of what your powerband is in HP and Torque. Maybe someone with some more knowledge on that program can chime in, I'm not sure of its features.

 

I just installed that program last week (Desktop Drag) and have'nt had time to really figure out the little stuff-they let you choose from a variety of predefined vehicles and they take just about EVERYTHING into consideration, weight, drag coefficient, %weight over rear end, torque convertor stall and slippage percentage, or manual trans, shift points, rear gears, tire sizes & widths, traction factors, weather conditions, there's probably other stuff I forgot, but there more to it than just HP. I never had my new engine dynoed, but from other math equations I've used it puts me at about 350hp-engine hp. I need specific rpm-hp and torque so I can really dail the program into my car. Right now the program says I should be running .1 faster than I ever have, and that's using the programs "street" engine 270hp and 391 tq-but everything else considered it ran pretty close to my actual dail, but the body style I had to use was a 98 firebird cause that was about the closest I could think of for weight distribution and drag coeficent to my car.

 

There is a simple formula to figure it out, no program needed, but I don't remember it.

I'd say type in 1/4 equation in www.google.com

 

They have a fairly crude one here: http://www.prestage.com/carmath/

It is just a guesstimate but should be within 2 or 3 tenths or so.

 

I know I won't get an exact, but I knew there was an "far from close" formula just to get a slight idea.

Josh