So how do you know that it will need that timing?? Is there a secret equation to find this stuff out or is just just know how??
That duration is shorter then a stock burst......... And I am just looking for a safe timing number so I don't blow the head off but can still mess around if I want.
With the setup in your sig? How much pulse?
I use 10° for every 1000us @ 3000rpm as a starting point. Your setup may like more / less. The only real way to find out is on the track or dyno.
That is a very efficient duration. And as far as figuring out the amount of degrees of injector on it's a fairly simple equation. Take your desired max rpm multiply by 360, divide by 60 and multiply by the desired duration. So 3500x360=1260000 divide that by 60 and you get 21000. 21000x.0017 equals 35.7* of injector on time. I then multiply that by .6 and get 21.42. That would be 60% of your injection event going in before top dead center at 3500rpm and a 1700uS pulse.