DFI, Batch Fire, and other myths

[Bruce Plecan]

-----Original Message-----
From: Charles Brooks <cbrooks1 at mail.tqci.net>
To: DIY_EFI Fuel Injection List <diy_efi at efi332.eng.ohio-state.edu>
Date: Tuesday, January 19, 1999 9:49 PM
Subject: DFI, Batch Fire, and other myths


>O.K. so the consensus seems to be that the improvement over
>batch fire systems that is seen with a SEFI system is negligible.

Other than what M Pitts pointed out

>So, how does the batch fire system operate with 8 injectors?
>does it fire 1/8th of the fuel every 1/8th of the combustion
>cycle? (I don't think it does :)  I just don't know what it does
>do.
>
>I had assumed that batch fire meant firing all injectors at the
>same time...

Yes

 And that SEFI fired a single injector when that 
>injectors' intake valve opened...

Strategy varies about when to fire the injector, but once
per cylinders ignition pulse.
>
>Does the batch fire only fire 2 at a time? 4?

Usually all 8
>
>I think what I'm going to do is buy the FIS PROM for the TPI
>setup and dump it to study. After I buy a programmable system
>I'll have the FIS PROM image to start with and fall back on in
>the event I goof something up. Does that sound like a reasonable
>line of pursuit, or a cop out?! LoL!

What's FIS, and what are you working on?, ecm?.
Bruce
>
>
>Charles Brooks
>