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

[Greg Hermann]

At 6:19 PM 12/15/02, Perry Harrington wrote:
>>
>> Ya, there's no emissions stuff.  We run with a straight pipe and no
>> catalytic conv.
>
>You ought to consider a couple of things.  OEMs get better mileage by
>recycling the exhaust gases (EGR).  The EGR allows you to reduce your
>fuel load and run leaner.

What the EGR really does is reduce the pumping losses at cruise due to
throttling.
>>
>
>> Oo, that's a good suggestion for research.  I think it's applicable... in
>> the competition, we open the throttle, get the car to x mph, then kill the
>> engine and coast to y mpg, then start the engine and run up to x ... etc.

Note that the Georgia overdrive approach makes the throttling losses disappear.
>

Greg



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