Quote:
Originally Posted by Joyridin
Actually, you are incorrect. A pump that is varying speed will create a lot more heat than one that is constantly run. Electric motors are basically designed to run at a specific RPM. Changing that RPM by varying the voltage creates heat.
The PMW system was designed for emissions plain and simple. Really, all you need is a pump, a Corvette filter mounted near the tank, and a few lines. That is close to half the price of a PMW set-up and has worked flawlessly for years on thousands of LS and now LT transplanted vehicles.
I have nothing against a PMW, especially on the radiator fan. They work great, but don't tell everybody it is cheaper and works better when it clearly does not, especially when you are going beyond stock.
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I do not think I ever said it was cheaper. Infact there is a post in this thread by the OP 6600DURAMAX asking why I said it costs more. He outlined the costs and they are close. I always welcome input, that is what forums are for. While not an electrical engineer my experience with variable speed dc motors comes from my many years of work in the hvac industry working with pwm dc motors and vfd drives on ac motors. Please understand a pwm type system does not vary the voltage to change the speed. The voltage never changes. Basically the power is turned on and off real fast to achieve the desired rpm. Amperage drops with rpm unlike a variable voltage system. All the new brushless battery tools use this or similar technology along with the rc cars. It is much more efficient than a variable resistor which just lowers voltage and creates heat. I can say that operating costs on a variable speed dc motor in a furnace are almost 5 times lower over a traditional multi speed electric motor.
My understanding is that the ZL1 pump will handle up to 650 whp. The CTSV pump will do 800 and dual CTSV can do 1000. Thanks for your input.