Electric water pump drive, any gains in ET?
On the situation of the alternator not charging while running down the 1/4...............the car actually slowed down.............. the amount of available voltage dropped enough to affect the ignition.
You would have to set this up "to advantage." The stock ignition is designed to operate on 14V, not 12. So you'd have to have a system where you could bypass the resistor to take advantage, some racers actually use special batteries with one or two MORE cells
I find it hard to believe that there isn't a fair amount of difference, let's add it all up.
The alternator itself is NOT that inefficient, BUT the belt drive friction, friction in the bearings, the HP of the fan itself, and the water pump. All together this HAS to be a fair amount of HP
So if you can get this down to a race with the car running (speculation) the ignition running off a special 14V battery, or an ignition optimized for a 12v battery,
Maybe a separate battery for starting, fans, electric pump,
Theory says it HAS to make a difference.