[Supras] AFM (hot wire type)

[berniek at technicaldevelop.com]

Rocky:

Did you ever measure the pressure drop across the Lexus AFM?  I tried to 
do it using a big shop vac on the bench months ago to suck air through 
it, and with about 1-2 KHz output on an oscilloscope, the drop was not 
more than a couple of inches of water.  Of course, the airflow in use is 
higher.


       Bernie


Rockey Fox wrote:
> I'll be fabbing a tube from the turbo inlet to adapt the FIPK near the 
> stock location to facilitate intake of cooler air. At one time I had 
> considered placing the intake air filter under the right side 
> headlight assembly but chose instead to mount my remote oil filter 
> there. I was also concerned that rain/water could splash into that 
> area and enter the fresh air intake stream.
>
> The total elimination of the AFM restriction by setting up MAFT-Pro in 
> speed density mode was a major determining factor for going in this 
> direction instead of the Lex AFM upgrade. The tuning capabilities are 
> much more robust too.
>
> Rockey 91T
>
> ----- Original Message ----
> From: "berniek at technicaldevelop.com" <berniek at technicaldevelop.com>
> To: Rockey Fox <supr91tt at yahoo.com>
> Cc: beyondlmts at aol.com; "Supras at supras.com" <Supras at supras.com>
> Sent: Tuesday, November 27, 2007 10:09:50 PM
> Subject: Re: AFM (hot wire type)
>
> Rocky:
>
>     Thanks for the correction.  You mentioned mounting the FIPK
> virtually (?) at the turbo before, but I thought it was because you were
> using a GM hot wire AFM, which is only about 2.5" long.
>
>
>           Bernie
>
>
> Rockey Fox wrote:
> > Actually I'm setting my MAFT-Pro up in speed density mode which
> > eliminates the AFM...basically I now need to figure out how to install
> > my FIPK to the inlet of the turbo.
> >
> > Rocky 91T
> >
> > ----- Original Message ----
> > From: "berniek at technicaldevelop.com 
> <mailto:berniek at technicaldevelop.com>" <berniek at technicaldevelop.com 
> <mailto:berniek at technicaldevelop.com>>
> > To: beyondlmts at aol.com <mailto:beyondlmts at aol.com>; 
> "Supras at supras.com <mailto:Supras at supras.com>" <Supras at supras.com 
> <mailto:Supras at supras.com>>;
> > Rockey Fox <supr91tt at yahoo.com <mailto:supr91tt at yahoo.com>>
> > Sent: Tuesday, November 27, 2007 7:38:57 PM
> > Subject: Re: AFM (hot wire type)
> >
> > Roberto:
> >
> >    The hot wire meter is not used on MkIII Supras but is used by
> > others, primarily Nissan and GM although there are adaptations of the GM
> > type for Supras (Rockey Fox is installing one).  To a large extent, they
> > are (were?) self cleaning.  I had an '84 300ZX bought new which had
> > one.  Every time you shut the engine off, it energized the wire to red
> > heat for two seconds  to burn off any contamination.  We have a last
> > generation Maxima which has one, and I do understand that they can be
> > troublesome, although the one in my ZX was not.  They work by putting
> > enough power into the wire to keep it at the same electrical resistance
> > despite cooling from airflow, and the measure of airflow is how much
> > power is put in.  There is also a fixed power variant in industrial
> > applications, but I do not believe it is used in automotive work.
> > Technically it is call a "hot wire anemometer".
> >
> >
> >    If the wire is dirty, airflow will read low.  There are procedures
> > for cleaning the wire with denatured alcohol, which should not be
> > detrimental.  I've seen a product like or identical to the one you
> > referred to.  It should be OK to use.  The wire is made of high
> > temperature corrosion resistant alloy, perhaps nichrome.  I would not be
> > afraid to do it, but would do the cleaning with care.
> >
> >
> >      BernieK
> >
> >
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