[MK4HACK]

Hi, I have a mk4 jetta 1.8t big turbo, bigger injectors, etc. The car wont hold boost at all you can tell it wants to take off but wont hit more then 3 psi. I have tried everything
-n75
-map
-maf
-wastegate
And many other things but nothing is working please help!!!

 

[MiltDoggie]

A little more info would be helpful.

What turbo? What injectors? Supporting mods? What is your tune? What are you supposed to peak at?

 

[MK4HACK]

Ebay 60mm turbo 38mm wastegate siemens deka 830s e85 fmic custom big turbo file to support said setup
When it sees any sort of boost it falls on its face, struggles to make any sort of boost and sometimes has a rough idle. I've checked for vacuum leaks

 

[Rockerchick]

When did this start? Was any work done prior to the issue? Have you scanned for codes?

 

[MK4HACK]

Basically a fresh rebuild. New rings, rods, bearings, all new gaskets. No other issues and no codes