Hi, I have VW with 2.0TDI BMM engine and it was never quite right with the boost but now things got to a point they can't be ignored any longer.
I've done a VCDS log in 3rd gear. I've only started from 1800rpm for safety resasons on a short and busy stretch but you could imagine turbo sitting all the way until then below 1100.
The graph on the right is just a normal DSG accelleration for comparison.
Also there are NO engine error codes or EML except one isolated occasion of flashing coil.
Full log is available here (middle rows is the 3rd gear)
https://drive.google.com/file/d/1XsnsyHyf-YiVV_8BuuVdIVGccmTxrzKb/view?usp=sharing
It is obvious turbo spools up way too late and I have to force the car into higher gear first to accelerate. Cat is gutted and there are very weird airy sounds when accelerating.
I have done the turbo actuator test with VCDS and the arm is clearly moving back and forth, but actual pressure doesn't change at 1400rpm.
I've checked the hoses from N75 to and the actual actuator hold pressure well. I had spare brand new MAP sensor and it didn't change anything at all.
Full boost system air leakdown test would be nice but I have no means and my usual mechanic has no interest other than going for full turbo replacement straight away. If someone in the Midlands UK area could help I'd appreciate.
Is there any way to tell from the graphs if the turbo is at fault or maybe an air leak somewhere.
If I can do anything else with VCDS or basic tools I am happy to try. Anything further will need someone better equipped to take over - happy to discuss all options!
I've done a VCDS log in 3rd gear. I've only started from 1800rpm for safety resasons on a short and busy stretch but you could imagine turbo sitting all the way until then below 1100.
The graph on the right is just a normal DSG accelleration for comparison.
Also there are NO engine error codes or EML except one isolated occasion of flashing coil.
Full log is available here (middle rows is the 3rd gear)
https://drive.google.com/file/d/1XsnsyHyf-YiVV_8BuuVdIVGccmTxrzKb/view?usp=sharing
It is obvious turbo spools up way too late and I have to force the car into higher gear first to accelerate. Cat is gutted and there are very weird airy sounds when accelerating.
I have done the turbo actuator test with VCDS and the arm is clearly moving back and forth, but actual pressure doesn't change at 1400rpm.
I've checked the hoses from N75 to and the actual actuator hold pressure well. I had spare brand new MAP sensor and it didn't change anything at all.
Full boost system air leakdown test would be nice but I have no means and my usual mechanic has no interest other than going for full turbo replacement straight away. If someone in the Midlands UK area could help I'd appreciate.
Is there any way to tell from the graphs if the turbo is at fault or maybe an air leak somewhere.
If I can do anything else with VCDS or basic tools I am happy to try. Anything further will need someone better equipped to take over - happy to discuss all options!
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