Boost lack : 0.5b (7.25psi) instead of 1.2b (17.40psi)

[Froggyfreddy]

I was surprised of the lack of pressure on my new RS4, so i took the pressure with a gauge.

Has somebody already been confronted to this kind of problem on S4 or RS4 biturbo?

No doubt 3 issues :
- CHECK ENGINE that put the system in safety control and reduce to 0.5bars (7.25psi)
- Leak in the pressure system
- one turbo out


Thanks to help

Fred

[Jay]

Get the air mass meter checked.

Regards,

Jay

[tartan_rob]

Get a healthcheck full stop. Where are you?

[Froggyfreddy]

after checking, it was coming from one of the two dumpvalves. So i ordered 2 forge motosport ones today !

I'm french, Britany.

[NeilMc]

I was having that problem. Both my diverter valves were dead. I replaced them both and slight improvement, but still only around 5-6psi. After a trip down to MRC, the MAF was diganosed faulty. Try unplugging the MAF once you get your new valves in and see if it makes a noticable difference.