Quote:
Originally posted by AsianE39M5
Damn! wayne didnt know you had a 996TT holy  looks really good... had one question whats that DV thing in your pics?? a blow off valve?
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Yes, the stock diverter valves have a problem with leaking. This is well known to some owners, some have experienced a honking/moaning sound that is a sign of a failing DV. Most turbo owners probably aren't even aware the stock DV's are even leaking, they don't have to necessarily have to make the honkin/moaning sound.
I have had a leaking DV since day one. Went back to the dealer tech and explained it was the DV and he said, "they all make that sound." At that point I wasn't ready to accept my turbo knowing it wasn't at peak boost, so I changed it out myself.
The stock unit is made by Bosch, the same one they use on Audi/VW turbos. I have worked on VAG turbos and knew exactly what the problem was. There are turbo owners on their 2nd and 3rd stock replacements. Bosch is on their 6 revision of the valve. I didn't feel like dealing with the dealer and just replaced with the Bailey. I have had the Bailey on my other turbo engines with excellent results.
DV's function like a blow off/ pop off valve but instead of venting out to the atmosphere they vent back into the intake. The ones in the images are upgraded Bailey DV's. The boost comes on much quicker and much more solid and holds!
