I have a pd105 remapped to around 150 it was mapped with no proof but I can feel it's faster than a 105 , this may not come as a shock but the turbo is whistling like a prostitute in the wind ,it went dead with no power and it started sounding really wierd ,I've been told I will need a bigger turbo on if I want it fixed is this right

Fault code P0234 turbo overboost condition

still got 105 injectors BTW, tia👍

2 hours ago, Fubar1 said:

Fault code P0234 turbo overboost condition

More likely to be a sticky vanes in the turbo. Your whistling may be collateral damage of the turbo bearings if the frequency of the whistle follows the revs.

If you were originally happy with the standard turbo you could simply replace it as it avoids getting into other issues consequent of a larger turbo.

Check the actuator is actually moving or not sticking at a certain point. My 1.9tdi used to randomly go into limp mode same error. Made a slight blow off sound just before the EML light came on turbo sounded a bit like a siren in the distnace. I sprayed the acctuaator with penetrating oil and manually moved it for ages until it felt smooth again. Problem solved so far. It could also be a failed actuator. I would stick with the original turbo as I reckon a larger one will cause other problems and perhaps the ECU won't like it.

Alasdair