I haven't done this in a while, and I was wondering if any of you guys could give me some ideas on what to charge various sponsors for different parts of the car. I've already promised him spots on both of our cars, but haven't given him a number or location. Please help!!

Here's some things we have done. We used to ask for a one time amount that covered the whole season. Our schedule got kinda spotty so we changed to asking for set amount for each event that we competed in. This way if something happens that causes your season to be cut short or less races than you had planned to run you won't feel like you shorted your sponsor or was indebted to them. It may be more appealing to them to come up with smaller chunks at a time. It also helps to have that cash to go directly to your trip instead of it being long gone before the trip.
Tony #7

Thanks Tony, I appreciate the help.
Matt