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Does anyone have a electric water pump that replaces the old mechanical water pump..? I was thinking about putting one in when rebuild starts, for apparently they offer more performance, well dont rob as much power as a mech one...?

I do but it is still sitting in the shelf. It should be mounted and tried out in a month or two.

I've argued this back and forth with myself but I can't decide without testing what is the best solution. Obvoiusly the pump needs to be turning very fast when on full throttle because then you need maximum cooling so you might not gain anything. On the other hand all the mech ones are probably designed for maximum cooling at lower rpms so at race rpm they have a lot of over capacity or even cavitates...

I can tell you one thing though, a buddy had a weird over heating problem in his race car a couple of weeks back, EWP and so on. Only found the cause after he returned home, the alternator was shot. Didn't deliver as much power as needed to turn the pump fast enough, only almost fast enough.

I cannot imagine a big benefit using an electric pump.
Currently I'm running the stock pump at -30% with good results.

-30%? Custom pulley for the pump?

IF you're not overheating with the stock pump, what's the point? Is a water pump really a large portion of loss due to external parts?

Custom pulley at the crank. Alternator turns ar -30% as well.

grant wrote:IF you're not overheating with the stock pump, what's the point? Is a water pump really a large portion of loss due to external parts?

Yes.

Also, if you ever drove a modern car with EWP, did you notice how fast the engine gets to operating temp. I was so astonished when my rental car once was immediately warm that I measured it. Less than a minute to get warm.

This OEM pump is what I intend to use.

http://www.miataturbo.net/engine-perfor ... ler-69420/

The PWM controller will be this

http://www.tecomotive.com/en/tinycwa-en