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Tesla, it's 5-10hp only at high rpm, when you're crusing it's obviously much much lower.
I don't think the problem of determining appropriate flow rate is that hard. Clearly these racing pumps on full power are going to be adequate for maximum load, so if we run a similarly rated electric pump at max speed it should do the job. For part load, we could set maybe 2 speeds that could be exhaust temperature controlled or something like that.
Some of the pumps I've seen are just electric motors that bolt onto the shaft where the pulley used to be, these would be the easiest to use since you can just match the equivalent crank speed to get the correct level of pumping.
I guess a good way to think about it could be, how much is the stock pump flowing at idle, how fast does the engine need to turn to start outflowing the electric pump on full blast. You could do this by just watching the pressure in the system with a pressure gauge attached to a T right after the pump outlet. Then you could have an "idle speed" on the pump that gives you equivalent pressure and therefore flow to the stock pump turning 600 or 800 or 1000rpm whatever your car idles at, and this should be safe for most low load conditions because most cars can cruise with their engines below 2000rpm anyways. Say if electric pump flow matches the stock pump flow at 3000rpm, then you could have a 2000rpm equivalent setting for medium acceleration conditions.
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