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

[William Shurvinton]

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 :-)

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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