injector dc/pw

[drdarthinvader]

i did some logging today on the injector duty cycles and pulse widths .i have 42lbs injectors (green tops) std items for maggie s/c


inj1dc (%) .... inj1pw (ms)
idle 103% ..... 228.565ms

wot 521% ....... 181.811ms


1. have i dialed the injectors correctly?
2. shouldnt the injectors only have a max d/c of 75-85%
3. small injector pulse withs dont go as low as 1.277 (b4004/b4003)

[joecar]

DrDI,

The correct injector pulse width pids for your PCM are IBPW1 and IBPW2... the other ones are for diesel applications.

The calc pids INJDC1 and INJDC2 use those two pids.

[drdarthinvader]

once again thanks joe

idle...............wot
ibpw1(ms) 1.709ms 12.879ms
ibpw2(ms) 1.709ms 12.879ms


injdc1(%) 1% 31%
injdc2(%) 1% 31%

is 1.709ms low enough p/w?

[TAQuickness]

The green top SVO42's do something magic around 1.709ms. With my particular set, I found a PW of 1.708ms results in not enough time to squirt any fuel and 1.709ms is too much fuel for hard decel. The joys of controlling fuel injectors with static fuel pressure :) Do a search for user NitroRocket or drill thru the links in my sig for "big injectors".

[drdarthinvader]

will do and yes i get some funny things happening under hard decel, the low end of my ve table is always being deducted when coping and pasting logged data anything from idle down (35-0kpa) it runs rough (low rpm) and wants to stall.........

[TAQuickness]

BTW - that's a great avatar