Diverter valves

[mbagge01]

With my 2004 cayenne tt with evom tune and evom diverter valves, I am still trying to determine my surging issue between 2500-4000 and wondering if one faulty diverter valve could be the culprit. I sometimes have heard the swooshing sound that the diverter valve makes when I have accelerated on occasion and wondering how I could check the valves without having to pull them out as the drivers side one is a PIA to get out. I have read that some people have purchased evom valves that have been faulty but I was hoping there is a way to determine a fault in one given our cars have two of them.

Martin

[clarksongli]

Sort of an interesting question here. Diverter valves should only be opening during decel.....the relieve the additional charge pressure back into the low side of the turbos(Inlet).

no back to the question. If the valves are opening during boost, that is not right. the other possibility would be the valve seals (evoms use viton o rings) could be damaged allowing boost pressure to bypass the piston.

The other option (and i don't know how EVOMs designed the valve, but some utilize the boost pressure to open the valve, while others "counterflow" and use the pressure hold the valve shut. You might have them installed backwards.

You won't be able to test inside the car....best suggestion i have would be to pull a valve, jimmy up a tube and a bike pump and try putting pressure on the bottom port to see if the piston opens before a normal PSI/BAR....if it starts to leak at say 5psig, you know the valve is defective.

[mbagge01]

I put them in the same way that the stock diverters were positioned. Maybe the EVOMs go in backwards?

[clarksongli]

I'm not 100% on the evom's valves, but they looking like a plunger style, so they would be sensitive to direction.

Did the directions have any info on install?