Quote:
Originally Posted by arghx7
Regarding the heads: you'd be hard pressed to find a DI engine with higher flowing heads than any Toyota D-4S engine. DI heads are going to be more restrictive than a PFI head, because mixture motion is created inside the cylinder. This isn't an S2000.
So all the BMW's out there with ECU controlled variable speed electric water pumps don't work?
The best way to gain power with an electric pump is to control the coolant temperature with the thermostat and set the coolant temperature and pressure delta across the engine by changing the pump flow rate. This is exactly how mass produced with OEM throttled pumps (electric or mechanical) do it.
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Sure when you are working with a BMW pump that costs a fortune specifically engineered into the car, they can do it. My particular case I can not drop below 9v or the pump will not turn the water I already had the schematic drawn up with a FET to change voltage based off the ECT input value. Problem is the table of data tolerance would be so tight with the coolant temp sensor operating range of (</= 1.0v) - (>/=2.0v) = 9v-12v output.
Basically scaling a 1 vt temp range change for a 3v difference in range output
Could be done maybe this is how BMW is doing it.