Quote:
Originally Posted by Mike@N54Tuning.com
I still don't get the naming. All of the progressive kits are PWM based. The only reference I've ever seen to this "PPS" name is from Aquamist sales people. If we're going to call traditional PWM kits "PPS / progressive pump speed' then the Aquamist kits should be called "PSO / progressive solenoid opening" or similar.
Any of the CMGS controllers can PWM a high speed solenoid. CM even has a solenoid that can stand higher pressure (and thus offers better atomization) than the Aquamist counterpart. One of these days I'll post some logs showing the differences at part throttle. Which will be underwhelming. And at WOT there is no difference.
Mike
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Coolingmists entry to the PWM meth control market was met with complete and utter failure. This is why they don't offer it. They were trying to run the solenoid at some absurdly high frequency which yielded a miserable dynamic range. All this stuff is well documented on the evo and subaru forums. I know you mean well but please don't re-write history.
Also Mike, the PPS nomenclature for variable speed pump set up is perfectly adequate. The pump is not physically toggling between two states (on/off). There is too much rotor inertia for it to behave like an on/off solenoid. Instead, the PWM signal going to the pump simply controls the rotational speed of the pump internals. Hence the term PPS (progressive pump speed).
Whereas a PWM system actually meters flow based upon two solenoid states (open or closed) that closely follows the PWM control signal (unlike that of a PPS system). There is nothing "progressive" about the solenoid opening. It's either open or closed. The transition time between the two states is incremental. The only thing progressive is the fluid flow out of the nozzle.