Use a Single Pole, Double Throw relay with the coil wired to the WOT relay and ground. Use the relay contacts that are not closed when the relay has coil current. That way when the A/C WOT relay opens up, the other relay does too, and the contacts close and make a path for the electricity to open the nitrous solenoid.
My only question would be: when does the ECU consider the throttle in WOT? Anything above 3/4? 5/8? 7/8? Only true 100%? Seems to me you'd want to find out at what voltage from the TPS does the ECU consider WOT, and make sure the TPS is set correctly.
This is where the switch on the throttle seems easier... pretty easy to just look at it and rig it for WOT.
This is where the switch on the throttle seems easier... pretty easy to just look at it and rig it for WOT.
All it takes to find out is to use a voltmeter and measure the voltage across the A/C compressor clutch coil and open the throttle. I don't think you would even have to have the engine running, just turn on the ignition and A/C and measure away.
Exactly... and this should be suggested to anyone wanting to spray off that relay.