[Supras] AFM (hot wire type)

[Rockey Fox]

Nope, never measured that, especially when I started investigating the speed-density mode and the programmability of the MAFT-Pro. I've got about $700 invested including the wide band O2, other sensors, programmable boost controller and wiring harnesses for a very tunable piggy back system. Hopefully I'll be up and running over the Christmas season as I'm finished with work after the 19th until next year which should afford some tuning time.

----- 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: Wednesday, November 28, 2007 6:27:13 PM
Subject: Re: AFM (hot wire type)


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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