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Here is what I have so far:

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DragA=.5 * densityAir*Area of the front of the car*velocity^2

DragT=Weight*.7

rpm=given

Axlerpm= Engine Rpm/(Gear*final drive)

Diameter(inches)= Rim+ 2(tirecross section * Aspect Ratio/100)/25.4

v(ft/min)=(diameter/12) * pi * Axlerpm

Now 1hp=33,000ftlb/min so could I simply say HP=v*mass ? That does not seem correct at all, but the units work.

If I do F=MA, I get units of lb*ft/min^2 which is definitely not correct. Basically I'm confused and any help would be appreciated it.

Thanks in advance for any help.