MAF History

[andy quaas]

Awesome!  I can't wait!

Andy

--- Ken Kelly <kenkelly at lucent.com> wrote:
> Andy,
> 	Dave Hempstead and I are working on tools for the
> 94-95 LT1 computer. I have an
> editor that will currently handle the basic switches,
> and the Ignition tables. I
> am working on the Fuel tables now. Dave has a scanner
> running, and is working on
> a program to download through the ALDL. Free tools
> should soon be available.
> Expensive ones are available now.
> 
> 		Ken
> 
> andy quaas wrote:
> > 
> > Have the important tables/switches been identified
> in these ECMs?  Can i
> > make a programmer?
> > 
> > Andy
> > 
> > --- Ward <wspoonemore at excite.com> wrote:
> > >
> > >      GM MAF sensors for 5L engines came out in
> 1985
> > > for the F car (vette0,
> > > it was Bosch FM type, so called because the air
> flow
> > > was represented by a
> > > frequency, much like Form MAP sensors. The
> frequency
> > > as in the 50 Hz
> > > region.
> > >
> > > MY86 F & Y cars used a newer version that was a
> > > variable voltage similar to
> > > the MAP sensor.  Both of these sensors were toped
> out
> > > at 250 grams/second
> > > electrically, so don't over think how to get more
> air
> > > trough it, the
> > > computer will never know the difference.
> > >
> > > 250 g/sec is about 280 HP using reasonable BSAC,
> > > (Brake Specific Air
> > > Consumption)
> > >
> > > Buick's used a smaller Bosch built MAF that was
> an FM
> > > type, I assume with a
> > > lower air flow measuring capability.
> > >
> > > The MAF went away in 1990 due to the very poor
> > > durability record, virtualy
> > > no V8 made through it 100k life w/o a new MAF.
> > >
> > > The came new hot film tech. Much beter
> reliablilty.
> > > Ater a couple of years
> > > .... The MY 92 - 95 LT1's were equipped with a
> much
> > > superior Delco modular
> > > MAF that has a higher measurement range.  This
> back
> > > to a FM type.
> > >
> > > The Current L29 (454) big block truck also uses a
> MAF
> > > and a MAP, The scan
> > > tool reports air flow in the 300's for WOT, so it
> has
> > > a higher range.
> > >
> > > The current crop of OBD II GM V8's use both MAP
> an
> > > MAF, (I think all the
> > > same P/N) to meet the tech requirements of OBD
> II,
> > > one of which is measuring
> > > and displaying peak power. The MAF is used for
> this
> > > and primarily for fuel
> > > calculations, The MAP is back up and used for
> spark
> > > Calculations as well as
> > > several threshold calculations.
> > >
> > > If I wanted to use a MAF I would use the newer
> PCM
> > > that is used in MY94 - 95
> > > F and Y cars, Its an under hood design, making
> wiring
> > > a lot simpler, It's a
> > > flash device eliminating EPROM's. Its re
> programmed
> > > via the ALDL connector
> > > at 8192 baud. Has the ability to handle any kind
> of
> > > transmission and
> > > excellent diagnostics.  Sort of like using your
> old
> > > AT to your P2 PC.
> > >
> > > Ward
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
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> > >
> > 
> >
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