[Gmecm] DFCO and EGR elimination

[Bill Shaw]

Down the downhill in third,  tap the brakes slightly to set the front 
wheels,   turn in and clip the apex while rolling the power back on.  On 
the floor at the apex,  hold it straight while drifting to the outside 
of the front straight.  Holding it to the floor to 6800,  shift to 4th, 
we blow past several p-bugs by start-finish.  Still on the floor at the 
start of braking zone we're approaching 6800 again but no room for a 
shift.  Hold it to the floor until 4 then off the gas,  hard on the 
brakes (***BANG!!***) fireball!  We just scared the sh!t out of a few 
people :-) Modulate the brakes, turn in hard,  trail brake down to about 
80mph @ the apex then back to the floor again and turn in a bit a bit 
more, we're closing in on the next p-bug......  I can't wait to get back 
on the track.

Fuel economy?  What's that? :-)

Best,

Bill
928s 4 mpg in track mode,  and all smiles.

Rick McLeod wrote:
> 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
>
> **********************END TRANSMISSION**********************
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