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Date:         Sun, 23 Sep 2007 15:16:23 -0400
Reply-To:     pdooley <psdooley@VERIZON.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         pdooley <psdooley@VERIZON.NET>
Subject:      Re: Replacement AFM technology
Comments: To: Scott Daniel - Shazam <scottdaniel@TURBOVANS.COM>
In-Reply-To:  <13e501c7fe14$3396cb70$6401a8c0@TOSHIBALAP>
Content-type: text/plain; charset=US-ASCII

Exactly. Speed density with a simple, inexpensive MAP sensor.

-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Scott Daniel - Shazam Sent: Sunday, September 23, 2007 3:02 PM To: vanagon@GERRY.VANAGON.COM Subject: Re: Replacement AFM technology

Would you want to buy a used/old/maybe dead one to experiment with, take apart etc ? Scott www.turbovans.com

PS - I'd be looking for a way to use an air mass meter myself - to retro fit that newer much better device. Or even eliminate it entirely - check out Honda's for example - multi-point EFI - no air mass or air flow meter. GM too, many other manufactures too.

-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of tinker man Sent: Sunday, September 23, 2007 3:02 AM To: vanagon@GERRY.VANAGON.COM Subject: Replacement AFM technology

Once again, me and my crazy ideas...

With all the potential problems we're facing in our vans in general and it's fuel injection system specifically (which is most hard to debug in the van, with no on-board diagnostics support), the one I'd most want to get rid of is the AFM, who's mechanical deterioration is the hardest to fix, and finding a replacement is getting harder and harder (and expensive too, $200 just for a remanufactured unit). I remember reading lots of talk about this on the list, and wonder if after all the talk someone has actually come up with an alternative?

So to get things going, a few questions:

1. Has anyone measured (or has the data of) the AFM transfer function, i.e. resistance or voltage output vs. air flow? For that matter, even a graph/table of resistance values/output voltage vs. sensor plate movement would be helpful (it's probably logarithmic). Bentley provides a graph just for the temp1 sensor vs. temperature, but non for the variable resistance vs. air flow.

2. Anyone know what maximal airflow is to be expected in the air intake path?

3. Since I don't have a spare AFM to play with, does anyone have high resolution pics of an opened AFM? What's the function of the three black rings located around the pivot?

4. Does anyone know if the re manufactured AFM's offered at the BusDepot and others have a NEW resistance board or is it just the simple fix of moving the old one a bit sideways?

Thanks, TM


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