Proform 850 dialing it in closer

Yes factory alternator, with a smaller pulley on it so it charges at idle.
What i do at the race track, Because my cooling fan and elec water pump run "anytime"(ign on or off) i hook my 10 amp battery charger up after every run. Battery is full charge before each run. unless i make it to semi's. then there just isn't enough time to get the full charge, before i restart the car.

I use to have my alternator set up so that at full throttle, it would remove the ground from the alternator (regulator) It worked just fine.....But i found that the car ran just a little more consistent if the alternator was running all the time.(electric fans draw a lot of amps)