Help with EFI Live
#1
08-31-2009, 09:11 PM
Join Date: Jul 2009
Location: Waynesvill,OH
Posts: 3
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#2
08-31-2009, 11:11 PM
Here check this out...
https://www.dieselbombers.com/chevy-...ly-primer.html
Hopefully that will get you started, Danny's got some good info in there.
https://www.dieselbombers.com/chevy-...ly-primer.html
Hopefully that will get you started, Danny's got some good info in there.
#3
09-01-2009, 01:39 AM
i did some calculations the other day on how many degrees the crank rotates every uS
basically what i came up with at...
1000rpm the piston moves .006*/uS
1500rpm the piston moves .009*/uS
2000rpm the piston moves .012*/uS
2500rpm the piston moves .015*/uS
3000rpm the piston moves .018*/uS
3200rpm the piston moves .0192*/uS
(i think thats correct)
it helps alot out with picking your timing based on how much of a pulse width your are running and it really tells you how many degrees your injectors are open before before even doing a log. logging it can telll you how any crank angle degrees the injectors are open for too based on your pulse width an rpm.
the way ive been shown to tune is basicaly tune to where your rail pressure can stay up high, if your rp drops too much your either demanding too much or there is something mechanicly wrong with the fuel system.
basically what i came up with at...
1000rpm the piston moves .006*/uS
1500rpm the piston moves .009*/uS
2000rpm the piston moves .012*/uS
2500rpm the piston moves .015*/uS
3000rpm the piston moves .018*/uS
3200rpm the piston moves .0192*/uS
(i think thats correct)
it helps alot out with picking your timing based on how much of a pulse width your are running and it really tells you how many degrees your injectors are open before before even doing a log. logging it can telll you how any crank angle degrees the injectors are open for too based on your pulse width an rpm.
the way ive been shown to tune is basicaly tune to where your rail pressure can stay up high, if your rp drops too much your either demanding too much or there is something mechanicly wrong with the fuel system.
Last edited by 2500HeavyDuty; 09-01-2009 at 10:25 AM.
#4
09-01-2009, 09:39 AM
The following users liked this post:
2500HeavyDuty (09-01-2009)
#5
09-01-2009, 10:22 AM
wait i got it backwards 
lemme fix it, i just got home from the bar when i posted that.
if your running a 3000uS pw at 2000 rpm it stays open for
(3000uS)*(.012*/uS) = 36* the ammount of degrees the injector is open.
the same pulsewidth at 3000rpm
(3000uS)*(.018*/uS) = 54* So the injector will stay open or 54 crank angle degrees at 3000rpm with a 3000uS puleswidth
lemme fix it, i just got home from the bar when i posted that.if your running a 3000uS pw at 2000 rpm it stays open for
(3000uS)*(.012*/uS) = 36* the ammount of degrees the injector is open.
the same pulsewidth at 3000rpm
(3000uS)*(.018*/uS) = 54* So the injector will stay open or 54 crank angle degrees at 3000rpm with a 3000uS puleswidth
Last edited by 2500HeavyDuty; 09-01-2009 at 10:26 AM.
#6
09-01-2009, 10:26 AM
#7
09-01-2009, 11:16 AM
wait i got it backwards lemme fix it, i just got home from the bar when i posted that.
if your running a 3000uS pw at 2000 rpm it stays open for
(3000uS)*(.012*/uS) = 36* the ammount of degrees the injector is open.
the same pulsewidth at 3000rpm
(3000uS)*(.018*/uS) = 54* So the injector will stay open or 54 crank angle degrees at 3000rpm with a 3000uS puleswidth
lemme fix it, i just got home from the bar when i posted that.if your running a 3000uS pw at 2000 rpm it stays open for
(3000uS)*(.012*/uS) = 36* the ammount of degrees the injector is open.
the same pulsewidth at 3000rpm
(3000uS)*(.018*/uS) = 54* So the injector will stay open or 54 crank angle degrees at 3000rpm with a 3000uS puleswidth
That works out pretty slick
#8
09-01-2009, 01:01 PM
either way thats tons of fuel spraying ontop of the pistons, theres still pilot injection and main injection and pressure to still figure out.
I've never even though about that 
#10
12-16-2009, 09:42 PM
