Standard injectors lag time ? powerFC settings ?

radiobar

New Member
hi !

anybody knows the standard injector lag time ?
using search i found 0.96 and 0.73, and also
a different way to calculate powerFC setting
when using bigger ones.

how important is the lag time setting ?
and what does it mean ?

on my powerFC i have 700cc ones(lag time 0.65),
but all settings are 0.00.
what would be the correct setting ?

car works fine,but i got one problem

from time to time i have misfires at my
wideband probe(not from engine).
it happens off throttle. when changing gears
slowly for example.
so it seems that the injectors are fueling for
a short time,although i am off throttle.
and the fuel seems to ignite at the hot probe.

i have made a test on a long downhill.
2nd at around 3000 rpm alltime ,no throttle.
my LM-1 shows 20.9% o2
but from time to time i have a small bang
and it shows different AFR,then back to 20.9%
and so on. it happens maybe every 5 seconds.

also when i change gears slowly i can see a 10.5 AFR
for a very short time,then it goes back to around 14.

sometimes there is also a small "bang" when car is
switched off. you can hear it at the AFR sensor,its located
just before the rear muffler.


thanks for any info
 

andygtir

Member
the standard 444cc lag time is 0.77ms

so 0.65 - 0.77 = -0.12ms lag time


injector correction % should be 444/700*100 = 63%
this may need tweeking with your wideband as it may still run rich/lean.
 
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