ASV down on power

I've got a remapped ASV 110 that doesn't pull like it should.
No fault codes, no warning lights. Vagcom showed actual MAF & expected MAF data were different so suspected faulty MAF sensor. Replaced, but no joy

Its got some initial pull, can hear turbo working, but over 2,500rpm its flat. No pull at all up to the red line
Not dumping any smoke that I can notice either

What do you think? N75 valve? Turbo? Clogged inlet?

Did you check the actuator valve for free movement with a vacuum pump? Where do you see actual and expected MAF data in VCDS?

Does the maf actual meet the maf spec in the group 3 of measuring blocks in vagcom? A lot of reman or cheap mafs are bad from the shop, even bosch remans.

data capture in 3rd gear WOT

Any chance you have a modified air-intake system that might be responsible for fouling your MAF sensor?
Have you checked the EGR/Intake Manifold for any flow restrictions from crud build-up?
Have you checked the Turbo Inlet Pipe connection to the turbo?

Totally standard car. New MAF cured it

F2 Ed said:

Totally standard car. New MAF cured it

Click to expand...

Cool, there seems to be a lot of dodgy new ones around, even bosch remans.