programming for a MAF based system

Jon Davis jfdavis at epix.net
Tue Mar 26 08:09:57 GMT 2002


The calculation with a MAF is simple. You need a curve for the MAF (I'll use
grams per minute here).

(2*gpm)/(#cyls*rpm*AFR) gives grams of fuel to inject per cylinder per cycle

You would need a couple tables... probably AFR vs. TPS (and/or MAF), you
would also need a table for the MAF itself.

Jon Davis

----- Original Message -----
From: "les" <lesd at earthlink.net>
To: <diy_efi at diy-efi.org>
Sent: Friday, March 15, 2002 12:46 AM
Subject: programming for a MAF based system


> Can someone point me to any hints for how to approach the
> algorithms for fuel calculations, as they apply to a mass air
> flow measuring fuel system?
>
> At first look, it seems that all the 'normal' variables needed for
> MAP systems just drop out of the equation. I suppose that I still need
> a 2d map , to allow for richening under boost, but it just seems too
> simple. I mean, other that for idle speed needs, rpm doesn't even seem
> to enter the equation. Air mass is air mass.
> I understand that the MAF is not linear, but a simple lookup table
> should
> fix that.
>
> -Les
>
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