Anyone know what could cause this? It only happens somethimes in 3 or 4th gear only that boost drops for 1 or 2 seconds from 1.1to 0.8 bar and than goes up again to 1.1 bar.
I have the stratmosphere divertervalves for about 2 years now and K16/24 with garret 1 bar actuators.
It happened more often when actuators were set at 1.2 bar,now at 1.1 bar it only happens once or twice a week...

 

I believe it's your wastegates cracking open. The way I understand it is the wastegates crack to test the overboost fail safe. I am sure someone here with more knowledge will have a much better explanation.

 

Could it be bad divertervalves??

 

hmm maybe , but if it as bad DV i would think that you would be seeing low boost all the time or more frequently.

also let me ask , are u using that factory digital boost gauge or do u have after market ?

 

I use the factory boost gauge,but when boost drops I also can feel much less power so the gauge seems to be working fine...

 

sticky leaky dvs.