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Re: Increasing fuel economy
Herb Ludwig wrote:[color=blue]
> "Coyoteboy" <coyoteboyuk@hotmail.com> wrote[color=green]
> > This isnt correct, the EGR injects exhaust gasses back into the intake
> > to reduce nox imissions by reducing in-cylinder temps on cruise. This
> > doesn lean or enrich the mixture as the exhaust gasses are inert.[/color]
>
> IMO, even "inert" exhaust gases being back-channeled into the intake will
> change the resulting gas mixture in the cylinder, since only fresh air
> provides the ca. 21% oxygen content. However, the computer should compensate
> for it.[/color]
I see where you are coming from and it would change the mixture if it
were a carb'd car, but in EFI cars the ECU is aware of the EGR and
knows to scale back the fuelling as there is now less oxygen in the
cylinder fill - hence the mixture doesnt change due to its compensation
as you say.
There are many myths about EGR and plenty of people remove them from
performance cars to improve performance, not realising they know
nothing of its theory of operation and that it doesnt affect
performance as its only active in cruise conditions.
J
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