Fuel Econ and Hiway Mode

[Bruce Plecan]

> << 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
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> L1 Advanced Engine Performance                    NJ Lic MV Inspector
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