[serialk11r]

I think power steering pumps will eat up something like 6hp at a crank speed of 7000rpm, and if you assume the power is proportional to the square of speed or so, at idle it's likely that the pump uses on the order of 100W give or take a few multiples, which is not too bad. EHPS systems draw like 4A idle, which after alternator losses is about 100W as well. However at say 2500rpm, that could be like 500W, which is kind of serious. If I had belt driven power steering and converting to EHPS wasn't really feasible I'd consider doing both an underdrive crank pulley as well as an underdrive PS pulley to slow it down a lot.

If you look at dyno charts before and after underdrive crank pulleys people usually pick up 5-10hp, but if the first 20% underdriving reduces the PS pump's work by 3hp, then another 20% underdriving could possibly halve that again. At cruising rpm you'd be going from ~0.5-1hp down to 0.2hp which is close to what an EHPS system would draw. Downside is steering effort will likely increase in parking lots but I don't mind muscling the wheel a little. I would personally buy a car with manual steering but I understand most people wouldn't.