Interesting P&H Driver Link and a MAP Question

[Shirley, Mark R]

Usually, you read the MAP at atmospheric keyon, before you start to pull a
vacuum.  If you had a separate one for baro, you could go up a mountain and
retain your baro compensation.  That's about it.

> -----Original Message-----
> From: Ken Bauman [mailto:303print at northrim.net]
> Sent: Thursday, April 05, 2001 4:05 PM
> To: diy_efi at diy-efi.org
> Subject: Interesting P&H Driver Link and a MAP Question
> 
> 
> 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?
> 
> Thanks
> Ken Bauman
> 
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