Hi Bubbles, I think you have been sent the right sensor. The reason i think this is because a MAP sensor measures vacuum as well as pressure, so 2.2 + 0.9 is 3.1 by my calculations. I think this sounds about right.
My OEM Mapsensor is faulty. Is it OK to change to the 3 bar one without making any other changes. I know that there will be no benefit without re-mapping the ECU to recognise it but wondered if it would run as normal.
I expect it will throw the air/fuel ratio out completely. From the above graphs, the ECU will have to know you have a 3.0 bar MAP sensor fitted to the car, otherwise it will not interpret the signal correctly. For example, when the pressure is 0.5 bar, the 3 bar sensor will output 2.25V. The ECU, calibrated for a 2.5 bar sensor, will interpret that voltage as 0.3 bar manifold pressure, because that is the manifold pressure that will cause a 2.5 bar MAP sensor to output 2.25V.
Remember that a Trionic 9000 has no air-mass meter so the air-mass is calculated from other parameters, of which the manifold absolute pressure is a very important part.
Thanks for the explanation Bill, I understand it now and the graphs help. I'll save the 3 bar for another day.
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