Just looking for some guys who run spray and can help me guestimate some numbers. I posted my first time track results earlier and I am looking for some feed back on gear ratio, a few of you have responded with good advice thanks!

I am now looking to hear from some guys who regularly spray and try to find out roughly rpm increase with x amount of spray. I understand it is going to be a bit difficult to gauge proper gearing without first spraying the car but I am not looking for dead on numbers just something close.

Well I am currently running a 12.49 @113.5 this is with absolutely no launch and I and trapping at 5,000 rpm. I am guessing that I will need to get my rpm's up to 5,500-5,800 on the engine so I can be crossing the traps at 6,800-7,000 on spray....this is of course a guess and this is why I am posting this thread.

What I am looking for is how much will my rpm increase with a 100-150-200 shot of spray? Once I know these numbers (roughly) I can figure out what gear I need to put in

Here is my cars specs:

355ci aluminum head 11.6 pistons comp solid flat tappet cam 2.44/.252 duration .520/.540 lift car has a muncie 4 speed with 3.70 gears and 28" tall tires

as I mentioned I am currently trapping at 5,000 rpm is it possible 150 shot of spray will increase rpm 500-700?

Let me here from the experienced.