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Message: <blockquote data-quote="shovel" data-source="post: 1588149" data-attributes="member: 29855">The engine driven pump is presumably producing more boost at highway speed (2500+ engine rpm) than parking lot speed (barely over idle) so if anything a constant speed should be an improvement. Since the engine controller doesn't have any idea what the car's road speed is there's not a good way to get commands from that and I'd rather not dig into the speedometer cluster just for this, so hopefully it's not difficult to find a single good setting that feels right to me and leave it there. The control box has a potentiometer for user input, you just dial in your desired boost.  I haven't checked its value but I expect it's 10k or 100k and that means with a little trial and error I can find some favorite settings, measure the value of the pot and then replace it with a resistor.   That also means someone else who doesn't mind building a monster could use a GPS activated relay to switch between two different resistor values at a predetermined speed.   I'm better with a soldering iron than I am with a welder but I don't want to introduce that level of complexity[ATTACH=full]49963[/ATTACH]Electric A/C is coming after I finish making the car driveable.. just in time for the heat of summer.</blockquote>