I personally wouldn't use your car to be honest...the batteries aren't the same as a leisure battery and are not designed to be deep discharged...as you might do charging on a days/weekends racing!!!
A good condition car battery will do it for a bit...and I know a few that do...but I don't like the risk of the big car not starting at the end of a race day! They are more designed to give a short high current burst to get your engine started...and are kept topped up by the engine the whole of their lives.
But a half decent Leisure battery battery will charge more than everything you need...and will be more than happy to be heavily cycled over and over again in the long term.
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