DeTomaso Mailing List: February 2001, Message #17

Richard,

See! I knew someone out there would know more about this EFI stuff...

But, errr.... uhhh... what be 'FAR'???

Two O2 sensors would still be each averaging four cylinders on a V8. 
Or is the FAR thingie something to do with knock detection? That's 
the only other sensor I know about on the engine which has something 
to do with ignition/fuel-air.

Enlighten me some more!

Thanks,

Kirby

At 23:59 -0500 31/1/01, Richard Barkley wrote:
>Kirby,
>
>The Ford EEC-V (which is BTW much more sophisticated than the Chebby
>ECUs) has the capability to sense the FAR of each cylindar's pulse. In
>order to accomplish this on a variety there is a paramater to tell it
>the delay time to expect from spark to pulse. Thus the two O2 sensors
>are sufficient to do the measurements. According to my sources (Mike
>Wesley primarily) there is a quasi capability to then adjust the
>individual injectors. Not sure exactly what this is but my guess is that
>since the EEC is a "learning" system, it learns how much each cylindar
>is off and adjusts things accordingly in an average sense (not stroke to
>stroke).
>
>Richard
>
><snip>
>>  The Haltech does batch fire at any rate you pick based on number of
>>  cylinders, etc. And the Haltech also controls the injector pulse. All
>>  EFI's would have to do that, I would think...
>>
>>  I can see why such a system would be expensive if it was dynamic.
>>  You'd need a sensor on the intake and exhaust of every cylinder for
>>  feedback to the ECU.
>>
>>  Wow.....
>>
>>  Even adjusting the system would be the mother of all EFI adjustments...
>>
>>  Tell me more!
>>
>>  :-)
>>
>>  Kirby
>>
>
>--
>Sincerely,
>Richard Barkley
>
>To Ski or not to Ski, that is the question!
>
>Richard Barkley
>(310) 373-6695 (home), 813-2432 (work)
>E-mail: richard.barkley@trw.com (work), rbarkley@earthlink.net (home)
>Mammoth Condo 2BR+loft/3Bath - Horizons 4 #186 (760) 934-6758
>Condo web address: http://home.earthlink.net/~rbarkley