RE: Cam tuning

["the Fredericks" <fredericksk@worldnet.att.net>]

Jim,

We use a MAF for all ECM airflow inputs.  There is a 2 bar MAP present, but
just to run the silly little boost gauge on the dash.  When people convert
to DFI or SpeedPro and keep the GM harness with a jumper harness for the new
ECM, they generally run the 3 bar MAP signal in the old MAF input signal
wire.

On most hopped up GNs, the MAF is maxed out after 15 psi of boost or so, and
any additional fuel enrichment is 'guessed at' in the PE enrichment tables.
A recent upgrade for these ECMs is a 8051 based Translator designed by Bob
Bailey that allows use of a wider range LT1/LS1 MAF and "translates" its'
signal.  With an appropriate chip the ECM can read up to 512 GPS, instead of
the old 255, allowing better intermediate boost tuning.

Kendall Frederick


> -----Original Message-----
> From: owner-gmecm@diy-efi.org [mailto:owner-gmecm@diy-efi.org]On Behalf
>
>
>   Bruce,
>
>   I am not real familiar with the Buicks (2-Bar map sensor)and I presume
> MAF. In my situation, with the early LT1's (92/93)  this is pure
> speed/density (no MAF) so all my editing in boost is done at 100KPA. In
> regards to your other post I am using Lucas 42#, high impedance injectors.
>
>                                   Jim
>

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