Quote:
Originally Posted by MPGeo
Can't see the pic... but I you remove your impellers, the pump essentially becomes an idler pulley. Add to that an inline electrical wp and you have essentially removed the wp losses completely... and transfer them to the electrical system... 
Your under drive pulley, if you can get away with doing it cheaply, seems to be the best route to go... Keep at it!  |
Oh I see, that's a good idea.
However the 2ZZ water pump is a pretty good design (the impeller isn't one of those crappy straight stamped steel vane ones, it's a properly shaped plastic part), and you always need some water flow regardless so I'm more okay with the small amount of energy waste at the water pump.
If we were talking about a Honda S2000 with 9000rpm rev limiter I would probably go electric pump though, since at 9000 the pump is sucking down 30% more power than it is at the 8200rpm Celica rev limit, probably like 4-6hp after you put in a big underdrive pulley.
Contrast that with a power steering pump, which is completely useless 99% of the time. Thankfully, the MR2 has an electric PS pump (which I might remove and make it a manual steering car). The other day I turned the wheel on a Mercedes S550 while it was off, and honestly it was not as bad as I thought. With 1/3 the weight over the front wheels, I'm sure the MR2 can do just fine with manual steering, and that would save ~55W of electrical power or 100W at the crank required to keep the electric pump idling.