Fuelab had speed control long before aeromotive. But I get what you’re saying.
The 200 gph can be wired to run 5 different ways. 4 of the 5 do not require PWM.
Waterman and be done with it
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For sure, they're both great pumps. I have a 41403 and it's been great. I run my speed control off a hobbs switch where my pump runs at low speed until ~20psi of boost then kicks to high speed with a Fuelab 5gpm rated regulator.
I also did a lot of research for a project we were working on a little while ago. We ended up going with the Aeromotive pump for a couple of reasons. The Aeromotive pump we used had similar flow and current ratings to the Fuelab pump we were looking at, but it didn't fall off or gain require as much power at higher pressures. The other thing I liked about it was that it didn't require anything special for an infinitely adjustable variable speed control. While it is easy to get a high/low speed control setup, to make it infinitely variable to change with engine load, you would have to come up with some sort of PWM controller. We were able to tie the speed control wire on the Aeromotive to the MAF sensor signal to make it adjust with RPM/load. This, along with a boost referenced regulator, allowed us to run a low 8 psi at idle that ramps up to 60 psi under full load to feed a solid supply of fuel to the CP3. I know the same could have been done with the Fuelab, but it wouldn't have been the same smooth transition and would have had a higher amp load at high pressure.
just out of curiosity, why MAF and not the FPR? was it due to the fact the fpr has high current/voltage at idle and low current/voltage at WOT?
My guess is the Aeromotive gear pumps are 0-5V reference with 0v being low speed and 5v being max. You could certainly do rail pressure off the sensor as they’re 0-5v but that could pose an issue if the tune is off causing rail to drop and pump speed to drop where MAF or TPS will be toward the top end of the 5v spectrum at full load.
I felt that MAF was a better indicator of engine load and therefor more in line with necessary fuel requirements. I also considered using MAP, but since I was planning to boost reference it, I thought it would be somewhat redundant. I used this double adjustable regulator to set the pressure. I set base pressure to 8 psi and used an adjustable voltage box to feed 5 volts to the speed control wire of the pump and set the high speed pressure to 25 psi. The rest of the pressure comes of the boost reference port.
I always wanted to try a dual fueler harness. FPR signal is PWM. Doesn’t get much cleaner for install either. Just not sure how it would work with the pump…….
I can read and calculate exactly perfect engine load values off the ecm directly from canbus, then that gets translated to a PWM voltage to supply fuel pump without need of a return or external regulation.
