Sequential vs Batch Fire

[James Ballenger]

I didn't fully explain these details b/c I didn't feel they were necessary.
High impedance injectors (saturation) have an opening time of ~ 1.2-2 ms. I
will be using Low impedance injectors (peak and hold) which have an opening
time of ~.3-1.2 ms (large variance due to a lot of different information I
have gotten from manufacturers).  

As far as closing time is concerned, I never got a figure for that.
Assuming .5ms, does the ECU stop the current to them .5ms early or is this
just added on to the existing pulsewidth values of most ECUs, unbeknownst to
most people?

James Ballenger

-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
Behalf Of Axel Rietschin
Sent: Saturday, October 28, 2000 7:31 PM
To: diy_efi at diy-efi.org
Subject: Re: Sequential vs Batch Fire


----- Original Message -----
From: "James Ballenger" <vtjballeng at yifan.net>

> Assuming 1ms opening time -> Duty Cycle is (10ms-1ms)/10ms = 90%
> Injectors = 13.75lb/hr/.9 = 15.3 lb/hr injectors

One small detail: injectors don't close instantly. You have an avg of 33% of
flow during the opening/closing time (which is more like 1.5ms by the way).
This reaction time adds something constant (close to 0.5ms, for all
practical purposes) to the pulse.




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