Minimum stable pulse width of larger injectors
04-21-2004 | 06:56 AM
#1
Thread Starter
On The Tree
iTrader: (4)
Joined: Dec 2002
Posts: 149
Likes: 0
From: Sleepy Hollow, NY
Minimum stable pulse width of larger injectors There are a lot of discussions about going to bigger injectors
to propoerly fuel higher Hp engines. How about the characterisitics
of bigger injectors at idle? There must be a minimum pulse width
which is stably controlled during idle and light throttle? WIth higher pressure
it would seem to me that our cars then would run too rich?
For example, if the 28.8lbps injector runs at 1% at idle, does a
SVO 30 lbs injector run at idle at lower pw? (Can the PCM control
to a finer degree?) This is important so one cans till pass emissions etc.
after going to bigger injectors,
Gert
to propoerly fuel higher Hp engines. How about the characterisitics
of bigger injectors at idle? There must be a minimum pulse width
which is stably controlled during idle and light throttle? WIth higher pressure
it would seem to me that our cars then would run too rich?
For example, if the 28.8lbps injector runs at 1% at idle, does a
SVO 30 lbs injector run at idle at lower pw? (Can the PCM control
to a finer degree?) This is important so one cans till pass emissions etc.
after going to bigger injectors,
Gert
04-21-2004 | 09:32 PM
#2
I believe I can answer your question. I have the Mototron 60#ers in right now with stock Fuel Pressure(~60) and the inj are rated at 3bar. So these are really acting like bigger injectors. I have stock heads and stock cam so my idle air is not raised so that doesnt help. Best I can get my AFR at idle is 11.5:1 !!
That is unacceptable. I have the ls1speed CAS regulator on its way so we will see if lowering the FP helps out. Hopefully it will. Otherwise I will be going with smaler inj. The minimum pulsewidth I was able to get under closed loop is ~ 1.86ms. I think it needs to be somewhere like 1.6ms, but it would not go lower no matter what I scaled the IFR table in Edit.
That is unacceptable. I have the ls1speed CAS regulator on its way so we will see if lowering the FP helps out. Hopefully it will. Otherwise I will be going with smaler inj. The minimum pulsewidth I was able to get under closed loop is ~ 1.86ms. I think it needs to be somewhere like 1.6ms, but it would not go lower no matter what I scaled the IFR table in Edit.
