RE: Ported MAF

[Carl Summers <InTech@writeme.com>]

The Porsche 928 MAF is scaled for higher grms/sec but have never seen the
exact transfer function of the 928 MAF...it is 0-5v though which means an
"easy" rescale inside the GM computer.....I am just now doing the finishing
touches on a conversion kit to use the 99 LS-1 MAF(which is frequency) to
replace 0-5v MAF's...Of course on GM's this will have to include a mem-cal
but is not the first market I am after.....should be testing on the chassis
dyno next week....I'll let you all know....ttyl
-Carl Summers



-----Original Message-----
From: owner-gmecm@diy-efi.org [mailto:owner-gmecm@diy-efi.org]On Behalf
Of Romans, Mark
Sent: Saturday, August 12, 2000 6:20 PM
To: gmecm@diy-efi.org
Subject: Re: Ported MAF


I am working on converting my 87 to 90 radiator shroud, dual fans, and 90
air filter ducting so I can run a 730 ecm and speed density to get around
the fact that the maf will read more than 255 grams/sec but the software
won't.
I have never researched it other than anecdotally but the Porsche 928 is
supposed to use a larger bosch maf.  I suspect if all the ducting was
replaced with larger ducting and some time was spent calibrating the maf
with the larger bosch maf you could make it work.
Mark
----- Original Message -----
From: "Carl Summers" <InTech@writeme.com>
To: <gmecm@diy-efi.org>
Sent: Saturday, August 12, 2000 5:19 PM
Subject: RE: Ported MAF


> Not saying you can't make it work but for emissions this theory does not
> work well....I have seen dual MAF's used but requires the outputs of each
to
> be converted to grms/sec then added together and used as a
> calculation.....From what I have seen no matter what you do with the
ducting
> one MAF will always read different than the one next to it....hth's
> -Carl Summers
>
>
>
> -----Original Message-----
> From: owner-gmecm@diy-efi.org [mailto:owner-gmecm@diy-efi.org]On Behalf
> Of WEG1192@aol.com
> Sent: Saturday, August 12, 2000 3:33 PM
> To: gmecm@diy-efi.org
> Subject: Re: Ported MAF
>
>
> In a message dated 08/12/2000 11:30:37 AM Eastern Daylight Time,
> amattei@mindspring.com writes:
>
> << Ported MAF >>
>
> Anyone considered installing two stock MAF sensors in parallel side by
side
> and then multiplying the gms/sec numbers by two in the ECM calcualtions?
> Would this work to give you more airflow at less pressure drop? All you
> would
> have to do is make sure the air split was done right to give equal
pressure
> drop through each one. Leave one MAF connected to the ECM as normal and
the
> other unconnected as a dummy sensor.
>

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