OK, I've been reading Meuller's crap too long, Just little bit of boost Options

[DNHunt]

How about a small electric compressor directly in the intake that runs constantly to provide a small amount of boost maxing out at say 4 psi. Boost is regulated by a stepper motor controlling a very small wastegate or very large idle air control valve. The stepper is contolled by the ECU using input from the throttle position sensor. Not much compression of the air and it could come from a cold air intake so no intercooler. It's pretty simple electronics. Would it work and is it worth the trouble?

Fire away (IMG:http://www.914world.com/bbs2/html/emoticons/ar15.gif)

Dave

[lapuwali]

Hmmm....

As I recall, an Eaton blower consumes about 9hp to produce 6psi of boost. This gives a 35% net boost in power.

Let's assume an electric setup will operate at 75% efficiency, so to make 6psi would take about 8.8kW to generate. A single 60Ah battery would make 0.7kW for one hour, or 8.8kW for about 5 seconds. So, a 1.7 would be boosted to 100-ishhp for long enough to make one 1/4 mile run by using 3-4 full-sized batteries.

If you had a big enough alternator, it would take about 16hp to get it to generate 8.8kW (about 730A at 12v), for roughly a 15hp net gain in power. The wire used to transmit this power would likely be nearly as heavy as a battery...

A compressor turbine as shown in that link would be more efficient than a Rootes-type blower like the Eaton, but would really need to spin a lot faster, and would likely be more efficient at better than 6psi. Figure 10psi, enough for 65% boost in power (gross), and the power requirements may be close to the 15hp, but with 115hp from that 1.7, not 100. A turbo would still beat it handily in efficiency, doing about 125-130hp net.

My math is very approximate...