[Supras] AFM (hot wire type)

[Rockey Fox]

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" <berniek at technicaldevelop.com>
> To: beyondlmts at aol.com; "Supras at supras.com" <Supras at supras.com>; 
> Rockey Fox <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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