What's needed for nitrous?

I use 1.5-2° for every 50hp figure. If your base tune up is good and you have no issues with pinging or detonation naturally aspirated - make sure you're running high test fuel, make sure the plugs' heat range is a couple numbers cooler than what you normally run, and make sure the fuel pressure is right. Nowadays I prefer a controller to do the ignition adjustment work when the system is activated rather than dialing a basic tune figure back on a car that I drive all the time. I dont like making the engine feel lazy 98% of the time and getting worse fuel mileage for the sake of that 2%.