A4 B6 1.8T no boost...

[B6_7093]

hi friends i have a b6 1.8T AVJ engine with 150 ps, my prob is that the car can t boost over 0,4 bar no fail no engine light nothing, i try the mbc to raice the boost but nothing, i connect it correct before the n75 valve, any suggestion what to try before get a new turbo??

[PreciseD]

Have you check for codes via a VAG-COM? Seems like you are stuck in limp mode.

[Myst420]

I seriously doubt its the turbo. Have you checked for vacuum/boost leaks?

[schaefer921]

sounds like a limp mode, either scan the car for codes or beat the car until a CEL comes on, then you can scan it, it really can be anything until you get the proper code readings

[B6_7093]

my first thought was a limp mode, i have scan the car with a smartphone app and obd adapter but no codes.... i will try to find and test a vag-com check, and after off this i must search for vacuum/boost leaks.

[Audi body]

From what I've seen, get rid of the MBC and just use the n75. The MBC will put your car in limp mode and you will not have boost.

[coltspeed]

Any news on this?

I also have the AVJ engine. It has a MTM stage 1 chip, but won't boost over 15psi even with the wastegate actuator disconnected. I would be interested to see how your problem is going

[garagebuilt]

Any luck? It sounds like you two may have a boost leak. A MBC will only put your car into limp mode if it is set above the target boost pressure that the ecu is looking for. Just a tip though, if you are going to run a MBC, take the N75 out of the equation completely. Either way, I would start with a boost leak test to narrow your issues down.

Good luck!