So I have an issue which is doing my head in. When I'm on the motorway travelling at a steady 3000 revs in 6th gear I can hear a constant air noise as if the diverter valve is just constantly open, its that sort of air noise. Also when I'm right on the edge of boost (0 on my digital boost gauge) I can physically feel the car jerking ever so slightly. As if it wants to go but hesitates then wants to go again. Then once I put my foot down it boosts to 21/22 psi and it flies as it should. It does go into limp mode on the motorway sometimes aswell and only boosts to 5psi with almost no turbo. I have done all the vac deletes (evap, n249, sai and n112) so the only vac lines left are my inlet to fuel pressure regulator, my inlet to dv and my inlet to brake booster. All the other vac points have been capped off correctly. My Dv is the forge 007p and I serviced it when I put it in a month or so ago with new o rings, new piston and new yellow spring from forge. Im thinking the only thing left that it could be is the N75 or lines going to the intercooler piping or round the back to the turbo. It was doing the same thing before all the vac deletes and the forge dv install.
Also its not throwing any codes etc and when I turn off and on again when it goes into limp mode it resets it and I have full turbo again. Bit strange there are no codes or cel tho. And around town etc there are no problems at all with the running of the car, I do still have that air noise though at low revs. My mate has a leon cupra and his doesnt make the constant shhhhhh noise so it leads me to believe there is definitely an issue that needs sorting.
Any help would be greatly appreciated
Also its not throwing any codes etc and when I turn off and on again when it goes into limp mode it resets it and I have full turbo again. Bit strange there are no codes or cel tho. And around town etc there are no problems at all with the running of the car, I do still have that air noise though at low revs. My mate has a leon cupra and his doesnt make the constant shhhhhh noise so it leads me to believe there is definitely an issue that needs sorting.
Any help would be greatly appreciated