MAF History

[andy quaas]

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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