Devilsown Methanol Alcohol Water Injection - View Single Post

Terry Syd · 03-03-2008

Yeah, that's got me a bit worried - that I might drop the voltage too low for the pump to operate. I might have to try a little bit bigger rheostat in series with the pump and then monitor the pump and the voltage drop across it as I wind up the pot. When the pump stops pushing water through the nozzle, then I find out what the voltage drop across it is, then add one move volt for insurance. Then run it up again and measure the resistance of the pot at the point the voltage reaches that 'insurance voltage'.

If I can get a 20-25% change in voltage (disregarding the dynamics of the change in flow through the nozzle at different pressures), then I can probably tune the basic system for my usage.

I'm running the basic on/off system without a controller. However, I am only running 9 psi boost and the WI system has now been set for around 6-7 psi. I really can't justify a controller for 2-3 lbs of boost change.

On the other hand, around town the engine is usually running in the range of 2400-2500 rpm when on boost. Out on the highway the revs sit at 3000-3100. That is a little more than a 20% increase in air flow. If I tune the nozzle and pot for 2500 around town, I can dial up the pump pressure for 3000 rpm when I get out on the open road.

I will be able to optimise the flow for off-road and around town, and then use another setting for out on the open road. When I come to hill on the highway the WI will kick in at just the flow rate I want. - At least that is the theory.

03-03-2008	#7 (permalink)
Terry Syd Alcohol Holic Join Date: Nov 2007 Posts: 104	Re: Pump adjustment screw Yeah, that's got me a bit worried - that I might drop the voltage too low for the pump to operate. I might have to try a little bit bigger rheostat in series with the pump and then monitor the pump and the voltage drop across it as I wind up the pot. When the pump stops pushing water through the nozzle, then I find out what the voltage drop across it is, then add one move volt for insurance. Then run it up again and measure the resistance of the pot at the point the voltage reaches that 'insurance voltage'. If I can get a 20-25% change in voltage (disregarding the dynamics of the change in flow through the nozzle at different pressures), then I can probably tune the basic system for my usage. I'm running the basic on/off system without a controller. However, I am only running 9 psi boost and the WI system has now been set for around 6-7 psi. I really can't justify a controller for 2-3 lbs of boost change. On the other hand, around town the engine is usually running in the range of 2400-2500 rpm when on boost. Out on the highway the revs sit at 3000-3100. That is a little more than a 20% increase in air flow. If I tune the nozzle and pot for 2500 around town, I can dial up the pump pressure for 3000 rpm when I get out on the open road. I will be able to optimise the flow for off-road and around town, and then use another setting for out on the open road. When I come to hill on the highway the WI will kick in at just the flow rate I want. - At least that is the theory.