Data log from trans brake?

[Brad T]

I never can tell when the car really leaves the line.Is there anyway to trigger something on the data log when I release the trans brake?

 

[Craig Smith]

You could run the transbrake wire to the nitrous enable wire and add the "N2O enable" sensor to your dash. Just make sure to set the TPS and RPM thresholds for the nitrous activation parameters above what you'll ever see so the ECU doesn't start changing timing or fueling.