I have Seat Ibiza year 2000. 1.8t, k03, remapped, fmic, decat, angle block spacer for 2nd lamda.
My car used to have a peak boost of aroud 1.4 bar on 3000 rpm, then drops to 0.7 at redline.
For the pas year it only reaches 0.8,0.9 bar and drops to 0.5 at redline.
Car feels slow and it is, lost 3 secs from 0-160 km/h.
There is no boost leaks from turbo to throttle body.
Tried different n75, still the same.
Tried unpluging MAF (wich is 2 years old)..still the same.
On vag com is noticable that requested boost is higher than actual boost.
Spark plugs are dark brown, exhaust is black, pops more often than before, have 1 lamda code on vagcom.
Can lamda cause this kind of low boost problem? Especcialy if it is narrowband...
Any helo would be highly appreciated.