DFI, Batch Fire, and other myths

[Greg Hermann]

>Why would it be a problem to deal with lots of boost when all the injectors
>(or a bunch) are opened at the same time?   Is the problem associated with
>pump pressure versus flow capacity, or with the actual manifold fuel
>dynamics?  Just curious.
>
>Walt.

Fuel flow dynamics (hammer, etc.,) in the fuel rails. Pump curve enters
into it as well, but not as strongly.

Greg
>
>-----Original Message-----
>From: Sandy <sganz at wgn.net>
>To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
>Date: Wednesday, January 20, 1999 9:37 PM
>Subject: RE: DFI, Batch Fire, and other myths
>
>
>>One thing that is very inportant to remember about injection CIS vs Batch
>>vs SFI is on cars that have boost it is a problem to deal with lots of
>>boost when all injectors (or a bunch) are opened at the same time. SFI does
>>much better in those situations, as it is easier to deal with the fuel
>>pressure vs boost pressure problems.  The ideal system for me that would be
>>very easy to do was a concept that I posted a millenium ago, just do a SFI
>>Batch system (Pat Pend, (c) etc), where they are not in sync to anything,
>>but follow a SFI pattern. No engine sensor or sync is required (read
>>simple) and you get most all of the needed SFI benny's. No fuss no muss.
>>The over-engineering problem has plagued the efi332 project for sometime,
>>and getting something simple running is the way to go!
>>
>>Some rambelings
>>
>>Sandy