MAP Sensor noise.

[Roy]

avos at cochlear.com.au wrote:
> 
>      It seems that alot of people have used the Motorola MPX4250AP MAP
>      sensor. What I am wondering is how most people use it. It could either
>      be mounted under the bonnet with an electrical signal to the
>      micro-controller, and then you have problems with noise, or it can be
>      mounted in with the micro-controller, in which case you must run a
>      pressure signal which could be accidentally cut possibly resulting in
>      catastrophic boost levels etc. Also there will no doubt be some
>      (small) delay in increasing the distance from the pressure source
>      (though this is probably negligable). What is the standard way of
>      doing this? I am thinking of mounting it under the bonnet, but havn't
>      decided this for sure. Is there relative advantages/disadvantages? Is
>      the problem of electrical noise easily solved with a low pass filter.
>      Any feedback on past experience will be appreciated.
> 
>      Adrian
>
>     From Roy, Spectrics 
>
>     Mount the Map sensor under the bonnet near to the manifold, use >     screened cable to your controller remembering proper grounding
>     strategies.  Ie Magneti Marelli IAW as used on them Cosworths!