Fuel Econ and Hiway Mode

[Gabe]

So.....  If a person had a choice  EGR or not EGR - and didn't have to worry
about emissions, which would it be?  What factors would influence one's decision
to go either way?

Gabe

Bruce Plecan wrote:

> > << Part throttle cruise
> >     detonation and NO x ramp up substantially. Maybe,  GM didn't teach
> this
> >  in school, >>
>
> > Take out the associated ignition advance/fuel trim ALONG with disabling
> EGR
> > and you have an engine out of a 60's car  that didnt HAVE EGR :-)
>
> > Ever see a race car w/EGR?
>
> Yes.
>
> Why doesnt my TR ping w/EGR passage REMOVED? I'm
> > talking on cruise/tip in.
>
> just struck a nerve here with me is all, but what makes you think you don't
> have any?.
> Tipin ping is often quite, and the only way to make sure you don't is
> running a least amount of timing progression chip, and that can play hell
> with lag.
> Also, get into rod stroke ratios, and the TRs are really hard to beat there.
> Ever notice some of the TR also use 800-900 in gear idle speeds?.
>
> > I think its a little bit backwards. The EGR's job, lowering the CC temps,
> > INHIBITS ping by what introducing an inert mixture to the CC.
>
> Tis not always the case!.
> Look at the syclones, and running EGR can increase the IAT 40dF (easily),
> and in doing that makes them a tad bit more prone to detonation.
>
> The EGR isnt
> > there to really COMBAT ping...thats what timing retard is for. Be it EST,
> > Vacuum advance, whatever. Keep CC temps low enuf and you'll not form NOx,
> and
> > you'll have less knock.
>
> And if low enough not enough energy to make much or any HP.
>
> It's all about compromises, and execution.
> Bruce
> >
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > Jim  (FA) Testa                                             TType86 on
> > #BuickGN
> > ASE Master Technician
> buick.fiendish.net:6667
> > L1 Advanced Engine Performance                    NJ Lic MV Inspector
> > jtesta1966 at aol.com                           NJ Lic Emission Repair Tech
> > http://members.aol.com/jtesta1966/buick.htm
> > Associate Sponsor, Buicks at Bristol (RCA/JTP)
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