Quote:
Originally Posted by oil pan 4
Lean burn works.
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Not on an OBDII controlled engine that was not designed to run that way.
I think you're missing the point about the water pump. The intention is to get rid of the belt entirely. Not only does this make the vehicle more reliable, but it gets rid of a lot of random losses from bearings, random idler pulleys, etc. Even the A/C, when the clutch is turned off, still wastes a little bit of power. Removing the belt entirely and everything that is powered by it will most certainly make a noticeable difference at the pump.
Also, having complete on/off control of the water pump helps greatly with warm up and cool down, and works great in combination with electric fans.
The change from V belts to serpentine belts caused an increase in fuel economy, removing the belts entirely gets even more. There is more than one vehicle these days coming with an electric water pump from the factory.