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Date:         Mon, 6 Dec 2010 21:53:44 -0800
Reply-To:     Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Subject:      Re: MAF Sensors and the Vanagon
Comments: To: David Beierl <dbeierl@ATTGLOBAL.NET>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
              reply-type=response

re Since it's the AFM doing this and not the ECU, a MAF device would need to simulate the effect in some way, by monitoring rate-of-change of the airflow and increasing the signal to the ECU when there's a rapid increase in flow.

----- Original Message ----- From: "David Beierl" <dbeierl@ATTGLOBAL.NET> To: <vanagon@GERRY.VANAGON.COM> Sent: Monday, December 06, 2010 9:21 PM Subject: Re: MAF Sensors and the Vanagon

> At 11:07 PM 12/6/2010, Larry Alofs wrote: >>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'm saying it's a good thing and corresponds to the accelerator pump > in a carburetor. When you open the throttle quickly, the air flow > increases very rapidly and the inertia of the vane, which is fairly > substantial, causes it to overswing somewhat. This tells the ECU > that there's more air going through the system than actually is, > causing it to inject extra fuel, hence for that short interval a > richer mixture. > > Since it's the AFM doing this and not the ECU, a MAF device would > need to simulate the effect in some way, by monitoring rate-of-change > of the airflow and increasing the signal to the ECU when there's a > rapid increase in flow. > > Yrs, > d


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