I delay the nitrous hit until the clutch is almost locked up. If you look at data graphs very long, you will notice that the car actually accelerates at a faster rate while the clutch is pulling the engine down. That's basically due to an inertia boost that you get while the rotating assy is losing some of it's stored energy. Using a nitrous delay allows the nitrous to come in on the heels of that inertia boost instead of adding to it, which in-turn makes overall power delivery much smoother for my radials and the no-prep surfaces that I prefer to run on.
I've got a Summit brand window switch in my parts bin that's never been used, yours if you want it.
Grant
