MSefi.com read only forum (Jan.15,2018)

im having trouble finding the right opening time for my injectors(summit racing 42#injectors, 12.8 ohm, they appear to be made by lucas). doing the cahnge from 2 to 4 squirts isn't working at idle because the injectors never fully open on 4 squirts. i have an idle pw around 1.8 - 2.2 ms and cruise 1.7 -2.5 at 4 squirts, after a full year at running 4 squirt and testing the other day i switched to 2 and need to retune.

the injector dead time to volts is off(volt changes affect afr)

when i first installed about a year ago i went into injector test mode and set it to .9ms and got nothing out of them, 1.0ms would get the tip wet and 1.1 would make a small spray this was at battery voltage @12.2, but since then i got a silly scope and took a few pics for you to look at.

i used a .1 ohm resistor for amplitude(voltage topped out at .1volt). i also notice at idle at 4 squirts the current never peaked. test was done @14.3v
im having a hard time interpreting the dead time either .7, .89, .936 or 1.127 not too sure where to take time readings.

There seems to be alot of noise in your scope pics so it's hard to tell. Here's a topic where I was doing the same thing, might be of some help?

viewtopic.php?f=29&t=32048

i followed the instructions for cal dt
i used a 45ml syringe attacted to the injector with a hose

did the flow tests and came up with

11.9v
4ms 26ml
6ms 40.5ml

13.3v
3ms 19.5ml
6ms 42ml

14.9v
3ms 21ml
5.5ms 39.5ml

i came up with
11.9v .62ms dead time
13.3 .4ms dead time
14.9v .162 dead time

i dont think this is right and i used .8ms but however i calculated a .133ms/volt battery correction and that helped out alot with varing afrs.