[Gmecm] DFCO and EGR elimination

[Bill Shaw]

By the time I got done writing it I was shaking,  the adrenalin kicks in 
just thinking about it :-)

Bill

Programmer wrote:
> I'm drooling, Bill. That sounds like too much fun.
>
> Lyndon.
>
>
> ----- Original Message ----- From: "Bill Shaw" <b.shaw at comcast.net>
> To: <gmecm at diy-efi.org>
> Sent: Tuesday, August 14, 2007 12:17 PM
> Subject: Re: [Gmecm] DFCO and EGR elimination
>
>
>> 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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