EGR Q's (was: Fuel Econ and Hiway Mode)

[Walter Sherwin]

I'm confused by what you've typed.  If "not" emissions constrained in your
application, then you'd be further ahead to disable EGR within the CAL, and
ameliorate all associated spark/fuel biases (assuming the EGR defeat had not
already done so).  If "yes" emissions constrained, then you'd best to try to
keep/tune EGR in order to avoid NOX consequences.  IMO, EGR is best used for
quenching NOX.......period.  All other ancillary effects/benefits are of
secondary consequence.

Walt.


>
> Ok, this leads to a pertinent (at least for me!) question on EGR:  One
plan
> of attack would be to do away with the EGR circuit (assuming emissions
> "legality") and adjust the knock-retard / ignition timing / AFR curve to
> compensate for the factory settings right?
>


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