[Diy_efi] Intro, and q's about fuel economy

[Shannen at grolen.com]

DI've retuned my car for 100% egr on acceleration, then leaned the
mixture to compensate for the extra fuel.  As soon as I can get the
thing going fast enough to leave the parking lot, I'll evaluate the true
performance potential of this mod.
Shannen
I>On Mon, Dec 16, 2002 at 10:32:41PM +0000, Mike wrote:
DI>> At 11:47 PM 15/12/2002 -0800, you wrote:
DI>> >It's simpler than that.  The exhaust gases already have fuel in
DI>> >them to some degree.  You recycle that in place of actual fuel.
DI>> >The only way to eliminate throttle losses is to have no throttle
DI>> >at all.  You then do the throttling via modulation of the valve
DI>> >timing.

DI>> Is this an april fools post or am I missing something, do you class
DI>> the rather less than 0.2% of available fuel in the exhaust as
DI>> 'exhaust gases alread have fuel in them to some degree' ?

DI>I'm still trying to get up off the floor from laughing.

DI>Cooled EGR is used as an _inert_ gas by several manufacturers to
DI>reduce the effective cylinder volume and to reduce the tendency to
DI>knock while maintaining a high cylinder pressure. (e.g. VW in their
DI>FSI and Toyota)

DI>> I would have thought the 0.2% or less to be negligible in terms
DI>> of adding fuel to a cylinders mix for its next power cycle ! !

DI>Shhh.. some people are into "recycling". ;-)

DI>> >What you want is an engine configuration that requires no
DI>> >enrichment (use EGR for enrichment) and has a flat torque curve.
DI>> >You can cam the little motor to peak torque really early, but a
DI>> >fully variable cam timing would be the best.

DI>> Huh - I am definitely missing something here, 'use EGR for enrichment',
DI>> pray tell what 'degree' of enrichment would you expect ?

DI>I need another laugh as well.

DI>_______________________________________________
DI>Diy_efi mailing list
DI>Diy_efi at diy-efi.org
DI>http://www.diy-efi.org/mailman/listinfo/diy_efi


_______________________________________________
Diy_efi mailing list
Diy_efi at diy-efi.org
http://www.diy-efi.org/mailman/listinfo/diy_efi