Boosted

me that the 225 has two?? diverter style valves...? with the primary being the usual one under the engine cover and the other one being in back outta of view near the motor? is this true? they said theres two valves due to their being two intercoolers? but only one turbo? they said they changed a couple of valves on a few TTs...I also spoke to someone at dealership who said he has had secondary DV changed.,,is their another DV or is it somekind of shunt or check valve...if so does anybody have any part #s or spec sheet....would like to check my other valve out to see if its leaking to...thanks

John P. (TT 225)

S4s and A6 2.7 Ts have two turbos, thus 2 DVs. I think they're wrong.

evan

the TT has one DV. It may have some other valve someplace, but its not a second DV. It has nothing to do with the IC's.

all AFAIK, YMMV. :-)

BigTT

The turbo does have a wastegate.... sounds like that is what they are talking about....

Boosted

I thought the dealer guys were wrong to.....but the one tech guy is really good....he routinely gets invites to work on the factory LeMans cars....but I do agree that two dvs on a car with one turbo sounds wrong....

evan

some sort of solenoid or actuator that makes it work. Seems reasonable that is what they might mean. Now that I think about it, I did hear about a guy who had that part fail, and is was sending exhaust out the back via the wastegate instead of spooling the turbo. Car had very little boost at all = not much power. Its not a DV, but I suppose it could be the culprit in your case.

Boosted

anything would be great.....it sure beats banging side of turbo with small stick hopin for the best..lol

OTOF

and it is a solenoid valve.

OTOF

<img src="http://albums.photopoint.com/j/View?u=1524173&a=13620968&p=53501859">

Vacuum System

1 - From fuel tank

2 - EVAP canister

EVAP canister is located at rear, below at vehicle floor, below a cover

3 - Check - valve for EVAP canister

Between EVAP canister and intake manifold before turbocharger

Installed position (light/dark half): arrow points in direction of flow, as shown

4 - Turbocharger

5 - Pressure unit for boost pressure regulation

6 - Mechanical recirculation valve

7 - Brake booster

8 - Check - valve

Between brake booster and intake manifold

Installed position (light/dark half): arrow points in direction of flow, as shown

9 - Wastegate Bypass Regulator Valve - N75 -

10 - Mass Air Flow (MAF) sensor - G70 - 11 - Air filter

12 - Pressure regulation valve for crankcase ventilation

13 - Vacuum reservoir

Bolted on at cylinder head

14 - Fuel pressure regulator

15 - Intake manifold

With Intake Air Temperature (IAT) sensor - G42 -

16 - Check - valve

Installed position (light/dark half): arrow points in direction of flow, as shown

17 - Turbocharger boost pressure recirculation valve - N249 -

18 - Secondary Air Injection (AIR) solenoid valve - N112 -

19 - Crankcase ventilation

20 - Secondary Air Injection (AIR) pump motor - V101 -

21 - Throttle valve control module - J338 -

22 - Charge Air Cooler

With charge air pressure sensor - G31 -

23 - Check - valve

Between EVAP canister and intake manifold

Installed position (light/dark half): arrow points in direction of flow, as shown

Boosted

Hey DENny....thanks this helps out alot... ))