Re: ECM for forced induction

["Jim and Sharon Brady" <bradyiii@shore.intercom.net>]

Ludis,
    So the 2-bar MAP sensor simply has the capability to read twice the
range of a regular (1-bar) MAP sensor?  Is this because with forced
induction instead of low vacuum or zero vacuum you have positive pressure?

Jim Brady
'87 Monte SS 383 TPI 6 speed

> Jim and Sharon Brady wrote:
> >
> >     What is a 2-bar MAP sensor.  I'm assuming one MAP table for
non-spooled
> > supercharger and one for a spooled up supercharger?
>
> It's a MAP sensor that reads from hard vacuum up to twice atmospheric
> pressure.  In the GM world, the sensor output nominally ranges from 0 to
> 5 volts.  A GM 1-bar MAP sensor has the same output voltage range, and
> hence, the voltages mean different pressures.  Thus, you cannot plug a
> 2-bar MAP into an ECM expecting a 1-bar MAP and have everything work
correct.
>
> --
> Ludis Langens                               ludis (at) cruzers (dot) com
> Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/
>


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