Does anyone know where I can get free plans to build an electric supercharger?

i don't think it would work very well if you did do that, they need to spin really fast in order to give any significant gain. I dont no where to get the plans but chances are none will give you anything worth the time or money.

why dont you just get a centrifugal blower and hook up a poweful high speed electric motor to the shaft where the pulley goes. then attach a ratiometer to your throttle so that you will build boost in responce to throttle position (instead of rpm) and run the power wire to the electric motor through the ratiometer. I think the hardest part of the whole thing would be to find an electric motor that will be fast and powerful enough to spin the compressor.

http://www.automotiveforums.com/vbulletin/showthread.php?t=160942&page=1&pp=1

Touchy subject...I still haven't seen one that works.

Thats what I want to try, is to build one that works. I have a 40,000 rc car motor. So I think that might work. Any links for plans or do i just go for it?

your gonna need something way bigger than an rc car motor.

The RC car motor won't be powerful enough to give any higher bost pressures.

To find an electric motor isn't the problem, but you will also need a more powerful alternator. An alternator is typically 1-2kW, you will probably need at least 10kW. It's much better to connect it mechanically, of you want to be able to shut it off use some sort of clutch.