MAFs

[Bruce Plecan]

> This GM MAF sensor sounds interesting.  I'm in the process of
computerizing
> an Aluminum/Bronze melting furnace and had the bright light Idea that
> measuring air flow along with a known orifice size and fixed propane
> pressure could kill two birds with one stone.  I could detect furnace air
> flow and therefore know that ignition and propane flow can continue or be
> started and also determine the mass of the air.
> Which GM vehicles use this MAF sensor or how much does GM want for it as a
> replacement part.

Some real late S10s, LT1s and LS1s  (starts in about 95 for various ones>

> What sort of output does it have or does it need a special circuit to
drive
> it?

Runs on 12v,  frequency output  (there is a posting about gms/sec. vs
frequency).  Probably the GMECM archives.
Bruce
>
> Thanks,
>
> John Dammeyer
>
>
> ----- Original Message -----
> From: "James Montebello" <jamesm at lapuwali.com>
> To: <diy_efi at diy-efi.org>
> Sent: Monday, February 05, 2001 2:57 PM
> Subject: Re: MAFs
>
>
> >
> > No seal is perfect, particularly a seal around a shaft rotating at
> > six-digit speeds.  But that wasn't my main point.
> >
> > I also never meant to suggest you weren't "doing this", only that the
> > idea had never occurred to me, and surprised me.
> >
> > I was wondering aloud what the advantages would be over a draw-through
> > MAF, or a speed/density system.  The disadvantage appears to be
potential
> > contamination of the MAF itself.  I fail to see the advantages, beyond
> > a bit more simplicity.  Simplicity can be a complete reason in itself,
> > as well as pragmatic reasons that doing so allows you to assemble parts
> > you already have into a working system.  Just wondering if there are
> > any other reasons.
> >
> > And by "fragile", I hardly meant mechanical strength, nor was I
referring
> > to any particular MAF sensor.  Most MAF sensors will not put up with
> > anywhere near as much abuse as a solid-state MAP sensor.  If the late GM
> > sensors do, then I'd say that's a welcome advance.
> >
> > james montebello
> >
> >
> > On Mon, 5 Feb 2001, Bruce Plecan wrote:
> >
> > >
> > > If the turbo's seals are gone, then that is the problem, and needs
> > > addressed.   New GM MAFs are true hot wires, and nothing in the air
> stream
> > > (but the wires, and a bridge to hold them),  I shot Carb cleaner on it
> and
> > > no ill effects.   The film ones are another matter and they most often
> have
> > > a film board in the air stream (also often have a plastic case).
> > > Picking parts for the right useage, is key.
> > > If your calling the late GM MAF fragile you need to take another look.
> AL
> > > housing, O-Ring seals, fully encapsulated, I couldn't dream of better.
> > > In my application, the MAF allows SEFI,  so while I spend $50 more on
> the
> > > MAF sensor, it's well spent in my opinion.
> > > FWIW, I'm actually doing this, not quessing about it.
> > > Bruce
> > >
> > >
> > >
> > > > Not just oil from the PCV, but oil from the turbo itself...
> > > > I'd never even considered using a blow-through airflow meter
> > > > configuration.  I suppose it would somewhat simplify the system, but
> it
> > > > seems you're trading off a set of cheap, robust sensors (MAP, crank
> angle,
> > > > and air temp) for a fragile, expensive one (MAF).
> > > > james montebello
> > >
> >
>
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