[Diy_efi] Accel Gen 6 DFI

[Shirley, Mark R]

> -----Original Message-----
> From: diy_efi-request at diy-efi.org [mailto:diy_efi-request at diy-efi.org]
> Sent: Monday, December 02, 2002 3:00 PM
> To: diy_efi at diy-efi.org
> Subject: Diy_efi digest, Vol 1 #384 - 4 msgs
> 
> 
> 
> Message: 1
> Date: Sun, 1 Dec 2002 12:36:29 -0800 (PST)
> From: Robert Wilkinson <rnwilkinson at yahoo.com>
> To: diy_efi at diy-efi.org
> Subject: [Diy_efi] Getting low impedance injectors to work 
> with Gen 6 Accel DFI
> Reply-To: diy_efi at diy-efi.org
> 
> Has anyone tried using 8 low impedance injectors with
> a Gen 6 Accel Batch fire DFI (015013)?
> 
> 
> Mr. Gasket is currently claiming that this DFI will
> not drive 8 low impedance injectors.
> http://www.mrgasket.com/maildirect/helpdesk/problemdetail.asp?
> ID=46895&TicketID=46895
> 
> However, there are 3 reasons that I'm not 100%
> convinced it won't work:
> 
> 1)
> Before the introduction of the Gen 7 DFI and the
> Variable Injector Controller, Mr. Gasket used to claim
> that the Gen 6 Batch fire DFI would support 8 low
> impedance injectors.  An article about the Gen 6 was
> printed in the Jan 1998 issue of High Tech Performance
> magazine.
> It said "The deficiency of most factory ECU's was also
> corrected by the employment of four peak-and-hold
> drivers in lieu of the customary two saturated drivers
> that most OE management systems incorporate.  This
> allowed the DFI the ability to control low-resistance
> high-flow injectors, enabling the fuel system to
> support huge hp numbers."
> Mr. Gasket was listed as the source of this article. 
> I asked Mr. Gasket about this in March 2000, and they
> emailed me and said "Sir, The article is incorrect". 
> However, they still keep a copy of this article on
> their website today.  The quote is on page 15 of 34:
> http://www.mrgasket.com/pdf/DFI.pdf
> 
> 2)
> The EMIC manual lists the typical current requirement
> for a low impedance injector, and it's very close to
> meeting the specifications of the drivers.
> "If a peak and hold injector or driver is rated at 4/1
> amps that translates as 4 amps to open the injector
> and 1 amp to keep it opened."  Then it says "A
> standard 015013 ECU incorporates 4 4/1 drivers"
> page 15 of http://www.mrgasket.com/ftp/pdf/EMIC.pdf
> Then they show a graph of a current vs. time for a low
> impedance injector.  It peaks at approx 2.5 amps, then
> holds at approx 0.5 amps.
> See figure 1.15 on page 14 of
> http://www.mrgasket.com/ftp/pdf/EMIC.pdf
> Using 2 injectors with one driver would then require a
> 5 amp peak, and 1 amp to hold.  Would this be possible
> with a 4 amp peak, 1 amp hold driver?
> 
> 3)
> Why would Accel choose to install 4 expensive
> peak-and-hold injector drivers instead of 2 cheap
> saturated drivers like the OEM's typically did?
> 
> 
> -Rob
> 
Rob, the way it was explained to me was that you "could" run 8 low-u
injectors off a 
015013 ECU, but it wouldn't work reliably, or long.  I asked one of the guys
who works
at DFI, in Wixom, MI.  It was more so that the drag racer could do it and
use the cheaper
non-SEFI box for short periods that they used the 4 peak/hold drivers. 

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