I am using a Racetech SDS ECU standalone computer that has a nitrous timing retard function. I am not sure I will need that though....Snow Performance claims that when you use WI with nitrous or a boost+nitrous application you don't need to retard timing whatsoever. Also, they mentioned that a 25% methanol to 75% water mixture is best in those types of setups so you don't overfuel. Also, as far as timing is concerned, you shouldn't need to retard anything if you're running a small (i.e. 50hp-75hp or less) shot.
I'll post results when I get a chance
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