650cc injector dead time

[laza101]

Anybody know what the dead time is on FIC 650cc injectors? How is it compared to stock 450's? Need some help getting this right, thanks.

 

[doug]

A guy on the DSMLink forums said 210 worked well for him.

 

[eclpsegsx12]

Assuming your global is set properly (Equation = old injector size(450) /new injector size(720) - 1.0 = -.375 or -37.5%), then make sure the car is fully warmed up to get stable LTFT values. Compare the LTFT at idle and at cruising speeds. You want both of these to be set at zero. If both are about the same, then your good to go and dead time is set correctly. If idle LTFT is more positive than cruise LTFT, increase the dead time, if its less, decrease the dead time. Basically, its a little trial and error here but isnt hard to figure out. Heres a table from DSMlink's manual:

Size Global Dead Time
550 -18% 180
625 -18% 180
660 -31% 180
720 -38% 450
850 -47% 315
950 -53% 315

This table is what has worked in many cars but may be different for each car so be sure to figure it out and make sure everything is on target. As an FYI, dead time will be divisible by 15 as the software will round to the nearest number divisible by 15.

Hope this helps you and anyone in the future with questions about upgrading injectors and resetting dead time/global. Enjoy!