I have a Chevy 383 that I want to put my Megasquirt setup onto. It's a zz383 crate motor, rated at 425hp/450lb-ft. If I plug in 425-450 hp in the RC Fuel Injector web calc, I get that I need 33-35 lb/hr injectors. I can achieve this by running some 30 lb/hr injectors that I already own at 55-60psi instead of 43.5.
Does this reduce the lifespan/reliability of the injector? Is there any reason I shouldn't do this? My other injectors are 42 lb/hr, which I think are probably a bit big for the application.
http://www.rceng.com/technical.aspx
Thanks,
-Dave
injector pressure question
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injector pressure question
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Re: injector pressure question
You need to make sure your fuel pump can provide the needed volume at that pressure. Also, you will need to adjust the dead time; it might be significantly different from what it is at 43.5 psi.
Jean
Jean
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Re: injector pressure question
Thanks Jean, I hadnt thought about the dead-time needing adjustment.
Refresh my memory, isnt there a way to determine dead time by
1) Setting 2 squirts per cycle, noting AFR at some RPM (say 3000rpm.)
2) Change to 4 squirts per cycle, noting AFR at same 3000 RPM -- if richer, dead time needs to go shorter, if lean, dead time needs to go longer
3) rinse & repeat till the AFR is the same
Or is there some better way?
Thanks,
-Dave
Refresh my memory, isnt there a way to determine dead time by
1) Setting 2 squirts per cycle, noting AFR at some RPM (say 3000rpm.)
2) Change to 4 squirts per cycle, noting AFR at same 3000 RPM -- if richer, dead time needs to go shorter, if lean, dead time needs to go longer
3) rinse & repeat till the AFR is the same
Or is there some better way?
Thanks,
-Dave
'70 Chevelle ZZ383/700r4/3.73 MS3X, 36-1, LS Coils, Holley Stealthram -- success story
'92 Saturn 1.9 DOHC/5sp, MS3, Champcar racer success story
'79 Malibu DartSHP400/80mm/PG/3.55, MS3X/36-1/LS Coils -- success story
Porsche 944 S2 3.0 -- MS3X/36-1/LS Coils, 1:44s Mid-Ohio, Pro Course
'92 Saturn 1.9 DOHC/5sp, MS3, Champcar racer success story
'79 Malibu DartSHP400/80mm/PG/3.55, MS3X/36-1/LS Coils -- success story
Porsche 944 S2 3.0 -- MS3X/36-1/LS Coils, 1:44s Mid-Ohio, Pro Course