More silly ideas

[Matt S Bower]

here again your talking about making it into a guage type of sensor.  On
guage sensors they either have some kind of tube or hole to atmosphere
or more recently they pull reference air through the wires.

Daniel Ciobota wrote:
> 
> Bruce et al.,
> 
>  I don't have knowledge of the actual hardware used inside a map sensor, but I
> assume it's most likely a piezzo device or a simple diaphragm/resistor type.
> No matter what is used I think there should be a reference pressure chamber to
> calibrate the device (a small cavity on the back of the diaphragm or piezzo
> sensor maybe).  If that cavity is sealed at the factory, then whatever pressure
> it was set up for then is the reference pressure, and not necessarily your
> locale's.  The solution in this case would be simple, just drill a relief hole
> in the cavity (making sure no moisture gets in), and you have a map sensor
> referenced to your every day baro pressure.
> 
>  Would this work or did I completely miss my guess?
> 
> Btw, if this does work it presents interesting possibilities, like referencing
> the sensor off a preset vacuum or boost.
> 
> Daniel