Slow Boost Problem! help

[AndersS2]

Hi.

my car is building slowly boost upon the revs, then topping it with 1,1-1,2 bar in the end. The car is VERY slow and runs like a pig with an half a leg.
MAF is whole, hoses are inspected, Mark-H mod are on, throttlebodie hose is changed, n75 pluggend in but uses a MBC instead, clamps replaced,check over and over again..

Dont know where else to look, and i've treid a search without any result for this problem.

Anyone got a clue?

[dubmeister]

Is there a wastegate problem- weak or damaged spring?
Is the turbo ok?
did it just go like this or has it gradually been getting worse?
can you pull any codes? (or are you running a different ecu(sorry , i don't know your specs))

[AndersS2]

The WG spring is actually two oem springs bound together.. it have worked before, but maybe i should try changing them out?

Turbo is new in may this year. GT3076R. Can it be wrecked already. The impeller is fine btw. no travelling in it.

Its been like this for a while, but i have sometimes got it fixed, then suddenly it goes on again.

Since i have a 4" turboinlet (incl maf and all), can the problem somewhere be in that area? Its mounted like this:

Airfilter->maf->hose->plumbback DV->hose->Turbo. Both hoses in this region is replacen newly and inspected thurrowly.

Just that i wonder due to the way the boost is comming, what the shceissel it can be?

I really dont have any clue.

[A80Avant]

have you checked the wastegate membrane?Or the DV is not sticking??

[AndersS2]

Membrane is also new this may, but i havent checked it yet..

DV piston is all good.

[dest]

Wgfv?

[Greg_S]

Have you checked for fault codes yet?

[prosty]

Since you've changed lots of stuff I suppose you've already pressure tested the system? If not. plz do so

[dkw_dude]

Since you've changed lots of stuff I suppose you've already pressure tested the system? If not. plz do so

Agree, and check codes!

Did the fault appear suddenly, did change anything around the engine just before it got slow? Try to backtrace your steps. If you still have the original crankcase vent. system the engine is very sensitive to leaks in this (Have experienced this myself recently). Hope you find the fault real soon!

[AndersS2]

no, i dont have pressuretestet the system yet..
Must take some time off to get it done now..

But one other thing is that on 500km's its using 3l of oil. so a rebuild need to be done asap.