Interesting P&H Driver Link and a MAP Question

[Greg Hermann]

At 2:04 PM 4/5/01, Ken Bauman wrote:
>A link I came across for making your own Peak and Hold drivers.
>
>http://www.ednmag.com/ednmag/reg/1995/090195/graph/18di5fg1.htm
>
>
>I'm hoping someone would be kind enough to give a good explanation on why some
>MAP based systems also include a second pressure sensor for ambient pressure?
>
>Several setups I have seen use one pressure sensor, usually a GM MAP sensor.
>Yet others use two pressure sensors, one for MAP and a second for baro. What is
>the advantage disadvantage of doing this?
>
The system can read baro pressure other than just at start-up. Rather
useful, for instance in country where one encounters large changes in
elevation.

Greg


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