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

[Greg Hermann]

At 6:36 PM 12/15/02, William Shurvinton wrote:
>Have a peek at www.bgsoflex.com/megasquirt.html if  you want to run with
>micro control. It's what I run. Not as flexible as some OEM stuff, but huge
>amounts of spare code space.
>
>WOT= Wide open throttle
>BSFC= brake specific fuel consumption
>
>You want to find the operating point of your engine where BSFC is the
>lowest. This 'may' not be the lean limit of operation. Or another way,
>ideally you would be able to work out exactly how much torque and RPM range
>you need to accelerate between x &Y and then optimise the engine to be most
>economical producing that torque with the throttle wide open. Makes more
>sense if you look at the standard curves in a text book that plot power and
>BSFC against AFR. You suddenly realise that catalytic converters may not be
>such a great thing after all :-)

"Internal Combustion Engines and Air Pollution" by Edward F. Obert has some
EXCELLENT info on all such stuff. If your school library doesn't have a
copy or three of this book, somebody ought to be "spanked" !!

Obert also includes some fascinating information on a wide variety of
fuels. WHO is providing the fuel for this little contest ?? Do you have a
CHOICE with regard to fuel to be used ??  :-)

Greg
>
>Bill
>
>----- Original Message -----
From: "James" <jester at splorg.org>
>To: <diy_efi at diy-efi.org>
>Sent: Monday, December 16, 2002 12:02 AM
>Subject: Re: [Diy_efi] Intro, and q's about fuel economy
>
>
>>
>> The plan right now is to use a microcontroller board (based on Siemens
>> 167CR) to do everything - where "everything" is a/d converstion of the EGO
>> and injector actuation.
>>
>> An all analog system is certainly intriguing.  I think it'll be easier to
>> develop the system with a programable board, but if we get everything
>> working before the competition, I'll start looking into a simpler system.
>>
>> 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.
>>
>> What're BSFC and WOT?
>>
>
>
>
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