Date:         Mon, 6 Dec 2010 23:07:14 -0500
Reply-To:     Larry Alofs <lalofs@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Larry Alofs <lalofs@GMAIL.COM>
Subject:      Re: MAF Sensors and the Vanagon
Comments: To: David Beierl <dbeierl@attglobal.net>
In-Reply-To:  <4cfd3a12.c74ee50a.1b78.ffffccc6@mx.google.com>
Content-Type: text/plain; charset=ISO-8859-1

David,
   Please clarify.  Are you saying that the mechanical inertia of the
vane is a good or a bad thing  Do you feel that the programming of the
ECU takes this inertia into account?
  I have always felt that the throttle response of the WBX was very
sluggish.  It seems to me that the inertia of the vane would delay the
ECU learning that the throttle had opened.  This would result in a
temporarily lean condition since the air flow increases when the
throttle opens suddenly but the ECU takes a moment to realize this and
doesn't increase the injector pulse width as quickly as it should.

Larry A.


On Mon, Dec 6, 2010 at 2:30 PM, David Beierl <dbeierl@attglobal.net> wrote:
> At 01:49 PM 12/6/2010, John Rodgers wrote:
>>
>>  Has anyone any new information about using/developing a MAF sensor for
>> our beloved Vanagons?
>
> Just a thought about that -- does it seem reasonable that something
> like an Arduino board could supply the necessary to drive and read
> the MAF and intake air temp, then convert that to a T-I and AFM
> output for the ECU?  It would have to supply rate-of-change
> compensation since the mechanical inertia of the vane provides a rich
> mixture on sudden throttle opening.
>
> The MAF that I once knew a tiny bit about kept the filament at a
> constant temperature.  It read voltage across the filament to
> determine the temp, and the output was the amount of current
> necessary to sustain that temp.  All the smarts were in the ECU, I believe.
>
> Yrs,
> d
>