[s-cars] RS2 MAF meter

[Mihnea Cotet]

Robert, Cody et al,


The RS2 MAF gives a different signal and depending on
the ECU, resistor R201 needs to be swapped in order to
have the right range. Otherwise the car runs too rich
or too lean. This makes that an engine can't have both
MAFs swapped back to back because the testing results
will be totally wrong...

IMHO and IME, the RS2 MAF is totally unnecessary and
furthermore requires native RS2 software, which may
not work optimally in the AAN ECUs.


This is based on my experience, as well as a few other
guys' as Tommy A from the 20v Kruemmer files group.


Mihnea
--- Robert Pastore <rpastore at animalfeeds.com> wrote:
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> FWIW, being unable to (or too cheap too) fund the
> research of air mass vs.
> output voltage on the rs2 vs. stock MAF, I have
> swapped a rs2 maf in to a
> stage 1+ car, and a stock MAF into my full rs2 car,
> and there was a big
> difference in the way they both ran.  Both were off,
> IMO, 15-20%, which
> suggests to me that the output signals have
> different calibrations.   I have
> heard stories that the only difference between the
> two is the style of the
> "screen", but don't believe it based on the above
> test.
>
> Bob
>
> -----Original Message-----
> From: Cody Payne [mailto:Cody.Payne at bconnected.com]
> Sent: Thursday, April 17, 2003 11:24 AM
> To: mlped at qwest.net; Philip Mische; S-Car List
> Subject: RE: [s-cars] RS2 MAF meter
>
>
> So Mike and Gang..are you saying that you do NOT
> need to purchase the RS2
> MAF if you are going w/ the RS2 conversion (granted
> you are missing the
> safety screen now) but can equal the flow and ECU
> g/s readings of the RS2 by
> removing the screen on a stock MAF?
>
> cp
>
> -----Original Message-----
> From: mlp qwest [mailto:mlped at qwest.net]
> Sent: Wednesday, April 16, 2003 7:26 PM
> To: Philip Mische; S-Car List
> Subject: RE: [s-cars] RS2 MAF meter
>
>
> Less restriction from the stock MAF's screen vs.,
> the RS2's plastic egg
> crate, i.e. the RS2 will flow slightly more air at a
> given pressure.  But
> then you can accomplish the same thing by pulling
> the screen(s) on your
> stock MAF too.  Take out a pair of calipers & do the
> math.  The screen
> physically occupies something  like @ 20% (I don't
> recall exactly any more)
> maybe even more like 30% of the area inside the 72mm
> barrel.   Yes, those
> little tiny wires do take up more space than you
> (well at least I anyway)
> would think.
>
> Speculation is that the two units generate
> "slightly" different, but so far
> as I know, not quantified, electrical signals from
> the hot wire to the ECU.
>
> Different chips seem to work with either MAF.  But,
> again speculation runs
> rampant as to whether everything is working at
> "optimum" levels when you mix
> & match.  You'll have to put burning bamboo splints
> under the nails of the
> chip gurus, and even then I'm not sure you will get
> a reliable answer.
>
> Mike
>
> ~-----Original Message-----
> ~On Behalf Of Philip Mische
>
> ~When is it advantageous to switch to the RS2 MAF
> meter?  I have to
> ~replace my stock one; if Bosch 0 0280 213 017 is an
> improvement
> ~this would be a good time.
> ~
> ~Thank you.
> ~
> ~Phil
> ~95.5 w/MTM Stage 2, RS2 EM, Abt exhaust
> ~
>
>
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