How much horsepower to turn the fuel pump on a cat!

I wouldn't think much, you can easily turn it by hand.

 

I'd say its more of a benefit then a loss to horsepower. The question is... when does the fuel pump become too restrictive?

 

Not enough hp loss to worry about. fuel psi is rpm based .( ie.. higher @ 1500 than at idle) can't do that with an electric pump. well you could but why ?

 

That pump is moving roughly 120-130GPH while also maintaining 75 or higher psi. The problem with this is I don't know of any company that builds an electric fuel transfer pump with that GPH capacity while maintaining that high of a fuel pressure with a constant load duty cycle. The Hp gain also would be so small that I doubt you'd see it in a dyno test

 

You'd be better off putting an ice chest with holes over your CAC and letting the ice water run down it during a dyno turn. Not sure if that's agin the rules tho...

 

Why do the ice chest mess when a CO2 bottle and some nozzles directed onto the CAA give a better cooling effect and cleaner look.

 

This is usually done in the pro class semi pulling trucks and works very well.