Alternator for my drag car

I do have a softball sized Denso racing alternator that I don't where I bought it years back and it is small and lighter than the Jones but it didn't charge enough at idle to keep the battery charged up with everything else that the car was pulling from the battery and had issues getting car to crank over fast enough at times and hooking it up after each round to a dedicated charger wasn't something I really wanted to do so going the route of a much better alternator worked best for me and zero issues since.