Land Rover Repair: Turbo boost adjustments?, mass air flow sensor, mass air flow

Question
P reg 5 door 2.5tdi.
If I want to turn the turbo down or up how do I do it?
Thanks

Answer
Hi Gordon,

I've never adjusted the turbo boost on my vehicle.  I would worry that it could overheat and cause unwanted detonation.  

I think it would have to do with the MAF and EGR.  

Here's what I found:

The Mass Air Flow Sensor (X105) is a hot film sensor which has a heated surface maintained by an electrical current at a constant temperature. With cool air flowing past the sensor, the volume of air drawn into the intake manifold is measured by the electrical current required to keep the temperature of the hot film sensor constant. This data is used to calculate the injected fuel volume and the rate of Exhaust Gas Recirculation (EGR).

The intake air temperature is measured by a thermistor with a negative temperature co–efficient and measures the actual temperature of the turbo booster air entering the engine. The ECM (Z132) uses this information, in conjunction with the manifold absolute pressure sensor, to determine the volume of air being drawn into the engine.

Hope this helps,

JohnMc