MAP Sensor

[Mike Blakey]

Thanks Ian,

If this is only being used for DIS, does a differential sensor not give a better 
result due to the fact that as atmospheric pressure changes so will the ratio and 
the advance accordingly?





Ian.Murphy at Arrows.com on 09/03/2001 13:17:43
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Subject:	RE: MAP Sensor

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MAP stands for Manifold Absolute Pressure, so substituting a gauge
(referenced to atmosphere) pressure is incorrect. MAP is often used to
calculate charge density and hence fuelling using thermodynamic / fluid
dynamics maths involving Ideal Gas laws.

Of course, if you include a Baro sensor when designing a system, you can
infer MAP from a gauge sensor.

Ian

> -----Original Message-----
> From:	Mike Blakey [SMTP:mike.blakey at baesystems.com]
> Sent:	Friday, March 09, 2001 11:08 AM
> To:	DIY_EFI at lists.diy-efi.org; efi332 at lists.diy-efi.org
> Subject:	MAP Sensor
> 
> My company has changed my e-mail address so I've resent this post...
> 
> I have made my own MAP sensor from a differential bridge sensor (-1 to 0
> bar). It 
> works fine but I'm unsure of the expected range on a manifold, so far I've
> only 
> managed to get down to -780 mbar. If this is about typical I can alter the
> gain and 
> span to get better resolution over the expected range.  My sensor also is 
> differential to atmospheric pressure, where as the OEM sensors do not seem
> to be, 
> is the correct?
> 
> 
> 
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