You can also buy a ready to go car and gear. I sold my "ready to go" malibu (that was fairly competitive - 9th out of 120+ at Summit point) for $1200.00 with spare engines / trans / rearend / brakes / wheels / tires / etc.... YOu can get the Lemons "everything legal kit" for around $400.00 for new and about $250.00 for used. This includes everything you need to be on teh race track.
Take the used car and the used safety gear( times 4), add the entry fee (about $1100.00) and you have a car that is sitting at your house ready to race. This is about 3500.00 before you even leave for the track.
Add some okay tires, maybe brake pads, oil and filter, other consumables this is about $600-$1000.00. Then you get to add gas. Gas is anywhere from $250.00 to $500.00 per weekend (just for the racecar).
Now you have to get there and back. Add $100 to $200 in gas just for teh tow rig (if you already have a trailer and truck).
Now you have to eat. If you cook out and have sammiches every meal, you can get by with about $200.00 for food and beverages for teh weekend.
Add it all up and you get: 4,650.00 on the low end and $6,000.00 on the upper end.
This is with a used car, crappy tires, and no updating necessary.
If building a car from scratch, add about $3000.00 for a decent car and about $5000.00 for a competitive car. It costs ALOT of money to be competitive in $500.00 cars. There is all sorts of money to be spent on tuning the computer / carb. Money to be spent on buying different suspenion springs, and suspension set-up. Track days arent cheap!
That is my .02$.
Also, the car choice impacts how much you spend.
This is also why we sold the Malibu and now race an RX7.
The race tires are $400.00 for 4, on the RX7 vs $750.00 for 4 on the malibu. I plan on getting 5 gph with the 7 and we got 8 gph with the malibu (or a difference of $160.00 in race car gas). Every race we are going to save $500.00 just by switching to a lighter car!
Rob R.