Ok so I have an odd idea. I wanted to post it on here to see if I could get some feedback as to if it would work or not. I love tinkering with Raspberry Pi computers and am an amateur programmer. I have an LS1 swapped 84 Corvette that I want to put nitrous on. I want a way to retard a few degrees of timing when the nitrous is on. I'm thinking about making a nitrous controller to run a multi stage system.
My idea is to use a Raspberry Pi with a relay card to add a resistor in series with the air temp sensor to pull timing. In theory this would trick the PCM into thinking the air temp is higher and would pull timing. I need to take a potentiometer in series with the air temp sensor and see what happens on the scanner when I add resistance. Then I would know what size resistor to add to the circuit with the Pi. But before I cut up my harness I figured I would ask here and see what you guys had to say about it. I'm not sure how fast the PCM will adjust timing when I add a resistor. If it takes a few seconds I could have it pull timing when the system is armed and then it would be good to go when I put my foot down.