FW: MAF Upgrad

[Clare Snyder]

Atkinson, David wrote:
> 
> How about running two MAF sensors in parallel?
> I'm sure you'd need some kind of happy box to interface the two
> and send out an integrated signal.  If there were enough interest,
> this could be a source of income for somebody ...
> 
>  Dave
> 
>  ----------
> From:  Peter Fenske
> Sent:  Monday, February 23, 1998 4:42 AM
> To:  diy_efi at efi332.eng.ohio-state.edu
> Subject:  Re: MAF Upgrad
> 
> Hi Larry
> 
> I have looked at using the LT1 maf on my 86 MAF.
> The LT1 is FM vs the 86 Bosch analog.
> 
> Several people have used the Porsch Mafs bigger but mucho dollaro
> And it is just a small matter to modify correction a wee bit.
> 
> The LT1 FM is possible since the V8 TPI code has an appendage
> left over from the V6 FM maf. Most of the freq handling code
> is there. The tables would have to change a bit.
> 
> However with the 89 with Vats there is a wee problem.
> The Vats freq measuring pin is used by the V6 to measure
> maf frequency. So you would lose your Vats a terrible thing.
> 
> Anyways the software is quite a mess. Just saying it could be
> done..
> 
> And MAP ain't too bad.
> 
> In addition there is provision for N-alpha in the code
> Ie rpm and tps. This is the backup code section
> for the Maf
> 
> later:peter
> 
> >
> >      MAF is a better system theoretically than a MAP system. The reason
> for
> >      this is that you are MEASURING airflow/density rather than
> calculating
> >      it. In practice, a MAF system is harder to package and there is an
> 
> >      inverse relationship between peak airflow potential of the MAF and
> its
> >      accuracy. The stock GM 3" sensor (i.e. 85-89 TPI) is fairly
> inadequate
> >      for a healthy motor (325+hp)...it just won't flow enough air. If I
> 
> >      could somehow get a late model 3.5" MAF to work with my 89
> >      harness/computer....that would probably be best...but I have no
> clue
> >      if/whether this would work.
> >
> >      TTYL!
> >
> >      Larry Kurek
> >
Why bother paralleling them? If they are identical, they will flow the
same amount of air each, so you only need one connected. Put a switch in
the circuit and you can carry a back-up.
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