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Originally Posted by Andrew
Lingenfelter makes upgraded coolant pumps that are PWM. Isn't that what you want for this build?
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Yes, and no. I wanted a PWM installation because I thought that's what GM did with the C6 ZR1. But they didn't -- they just run the pumps at full speed. They even run the pump at full speed in the C7Z06.
My main question was the 3rd wire in the provided GMPP harness -- which I now know is a 5V signal to the ZL1 pump to, you guessed it, run the ZL1 pump at full speed. That wire is not a PWM signal, and there is no PWM option anywhere in the GM lineup, which continues to the present day.
Even the LPE Stewart option just runs at full speed, and is advertised as flowing as well as the ZR1 pump.
So... I'll run the ZR1 pump at full speed. It simplifies the wiring, and wraps up all the engine wiring questions.