[Gmecm] DFCO and EGR elimination

[Rick McLeod]

also, DFCO (De-acceleration Fuel Cut Off) is used to coast the engine when the system recognizes that the driver has lifted off the accelerator at speed, to save fuel and maintain control of speed, then re-applying fuel prior to disengagement of the drive train so the engine doesn't stall. This greatly aids drivability and economy, as frequently the intnet of a 'lift' is to slightly slow the vehicle, but the idle circuit provides enough fueling to keep the vehicle at speed, contrary to the drivers intent, and the added fuel saving is slightly noticable (requires slightly less braking to stop when the time comes)

I've a TPI Camaro and have tried both with and without DFCO, it is definately more drivable with it!!


----- Original Message ----
From: Cowen <captain_krill at yahoo.com>
To: gmecm at diy-efi.org
Sent: Tuesday, August 14, 2007 12:30:46 PM
Subject: [Gmecm] DFCO and EGR elimination


Hello folks,
I think I understand how turning off EGR could be
useful, as you might then be able to eliminate
components, in addition to possible
performance/driveability improvements and
considersably simpler code.

On the other hand, I'm confused about the DFCO.  What
are the benefits of eliminating DFCO?

Duncan

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