I had a quick question for anyone that might be able to help. I have a higher demand electrical system in my f150. I was considering putting in underdrive pullys to free up a few horsepower, or putting in electric fans. I don't think that I could do both because of the 3 100watt offroad lights and 340 rms amp that are currently in use. If I was to put the underdrive pullys on would I be producing enough power with out e-fans. Or should I leave the underdrives off and go with the e-fans (would I have enough to run stereo, a/c, fans, and lights?) Is my alternator already maxed out so I should leave it as is?

Thanks for any help

 

I would go to the chip forum and post this for Mike. I know he says that his E-Fans can be run with under drive pulleys but I don't know about the rest of the load you have.

 

Just get a 2 pulley set instead of the 3 pullies...