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What are the advances to running a MAP sensor pre-throttle body AND one on the manifold?
I often have been removing the pre-throttle body MAP sensor when installing a tuning an Emtron and just tuning off the MAP sensor on the manifold. However, I am wondering if there is a reason (maybe advantage?) to running a pre-throttle body sensor.
If you are running boost control, then the pressure pre-throttle is the boost pressure, where as the manifold pressure isn't. For normally aspirated engine, that represents the ambient pressure including any ram-air effects.
Yes it can provide more linearity in torque demand rather than the boost control PID fighting the driver's throttle inputs unless TPS based boost targeting has been very well tuned.
