I am running a 17.5/4 Cell (EP4600 packs) on 160 flat oval track. I recently checked the amount of mamps left after 4 minute heats and was surprised that I was only using approx 2300 mamps. I was wondering if anyone else had checked their batteries this way??

..yup, which is why a class like this could be a BLAST to run 6,7,8 minute races.....(although I couldn't stand that long on the drivers stand...)

Joe, I agree with standing of the stand that long, the issue is tire wear, on foams you really up the tire bill.

I run 17.5 SK 4cell at our local track and we do 2 four min heats and 150 lap or 10 min main and we still have plenty of juice left.