[Gmecm] DFCO and EGR elimination

[Programmer]

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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