People that race heads up are mostly on lithium batts that deliver full voltage during discharge without an alt. Bracket racing you'd always be better off with an alt. Repeated cranking, ect without an alt will leave ya stuck in the lanes one day. Worst case you need a jump, but once running you're fine. I run alts on my sp bracket car and foot brake car. The other 2 are lith without alt, but they both push to the line.