Open loop at WOT???

[Gary Derian]

The V-12 Mercedes engine originally ran rich for max power at WOT.  It was
recalibrated to remain in closed loop at WOT to reduce emissions.  The power
was reduced from 406 hp to 389.  Top speed was still governed to 155 mph.

I think warranty considerations cause most OEMs to set the fuel rich at WOT.

Gary Derian <gderian at cybergate.net>

-----Original Message-----


>Thanks for the response, Richard.  I suspected that that might be part of
>it, but wasn't sure.  I guess the OEMs don't think their cooling systems
are
>up to the task at consistent WOT?  Or is it because detonation is more
>likely at WOT?
>
>At any rate, thank you for the answer.
>
>GR
>
>> -----Original Message-----
>> From: richard vandervoort [SMTP:fastski at mailexcite.com]
>> Sent: Monday, August 03, 1998 2:06 PM
>> To: diy_efi at efi332.eng.ohio-state.edu
>> Cc: george.reiswig at intel.com
>> Subject: Open loop at WOT???
>>
>> The OEMs purposely run rich at WOT because the engine
>> runs cooler.  Emission are not regulated and there
>> isn't any effect on MPG numbers since they do not use
>> WOT during fuel economy testing, so there isn't any
>> penalty for running rich.  Someone has probably already answered this,
but
>> I couldn't find it in the archive.
>>
>>
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