[Diy_efi] Newbie with a simplified Motronic project

[arnie]

The point/intent of the MAF being self compensating is to CONTINUE,
hopefully for the practical life of the vehicle, to meet the EPA specs the
vehicle was originally built to, WITHOUT outside, meaning manual/hands
on, input/adjustment.  It would then become apparent we are talking closed
loop, which uses the O2 sensor input to maintain correct A/F ratio.  Without
the O2 sensor input, how else to monitor and self compensate accordingly?

GAS

----- Original Message -----
From: "Eric D Byrd" <klox at juno.com>
To: <diy_efi at diy-efi.org>
Sent: Monday, October 28, 2002 5:06 AM
Subject: Re: [Diy_efi] Newbie with a simplified Motronic project


> to GAS,
>
> On Sun, 27 Oct 2002 13:59:39 -0600 "arnie" <arnie_ at charter.net> writes:
> > The MAF system will self compensate for changing in engine VE as
> > the mileage/wear take it's toll.  As engine wear would occur, a SD
> > setup would need to be 'retuned' to compensate for changes in engine
> > efficiency.
>
> But only in open loop, right?  In closed loop, O2 governs mix via
> feedback.  And here is something I wonder.  As wear occurs, VE drops,
> right?  And that means for a given tuned fuel pulse, the air actually
> available drops, which would tend to richen the mix and make emissions
> worse, but not necessarily reduce power.  Do you get more specific power
> from fuel when it burns stoich?  Or is it pretty much the same when you
> have less oxygen than you need?  I guess it would depend on reaction
> energy of fuel to CO2, vs. fuel to CO.
>
> >
> > GAS
> >
> > ----- Original Message -----
> > From: "Eric D Byrd" <klox at juno.com>
> > To: <diy_efi at diy-efi.org>
> > Sent: Saturday, October 26, 2002 11:13 PM
> > Subject: Re: [Diy_efi] Newbie with a simplified Motronic project

> > > With those in mind, I still wonder why they bothered with making
> > > an MAF sensor.  It isn't more accurate, simply because all your
> > > accuracy rests on the accuracy of your tune in your ECU.
> >
> > > --Eric Byrd



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