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  1. #1
    Senior Member Three Rings 1thenaton1's Avatar
    Join Date
    May 13 2010
    AZ Member #
    58947
    My Garage
    Q7 TDI
    Location
    SLC

    Leak at passenger side turbo inlet

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    Recently had some sluggish performance and and periodic limp mode on my B5 which is set up with F21 turbos and franken inlets. Started with boost pressure positive deviation code but no CEL, eventually CEL illuminated, scan from today:


    Conducted a smoke test and found a significant leak from the passenger side turbo inlet. I am thinking the best route is going to be to cut and coupler the inlet - this seems challenging with the engine in the car. Has anyone done this before? Any tips?


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  2. #2
    Veteran Member Four Rings vavJETTAw36's Avatar
    Join Date
    Jul 04 2012
    AZ Member #
    96276
    Location
    Woodbridge, VA

    Leak at passenger side turbo inlet

    Yea you can do it with the motor still in car.

    Support engine
    Remove belly pan
    Remove engine support bracket
    Remove engine mount bracket
    Remove head light
    Remove top inlet with lobsters
    Unbolt inlet from bracket
    Remove inlet and pull it through headlight

    For a little more room you may have to unbolt the sway bar and loosen it from the end links so you can simply swing it back and let it hang.



    By the way, a leak at the inlet would be causing a lean condition


    Sent from my iPhone using Tapatalk

  3. #3
    Senior Member Three Rings 1thenaton1's Avatar
    Join Date
    May 13 2010
    AZ Member #
    58947
    My Garage
    Q7 TDI
    Location
    SLC

    Thanks for your reply!



    Quote Originally Posted by vavJETTAw36 View Post

    By the way, a leak at the inlet would be causing a lean condition
    If that's the only leak maybe, but at this point it prevents me from being able to pressurize the system and check for other leaks

  4. #4
    Veteran Member Three Rings PwrWgn's Avatar
    Join Date
    Sep 14 2013
    AZ Member #
    123136
    Location
    Seattle

    Luckily for you, the passenger inlet is the easier of the two to R&R while in the car. With the airbox out of the way it is trivial. I don't even see the need to fiddle with the engine mount/bracket.

    Drivers side not so much.

  5. #5
    Senior Member Three Rings 1thenaton1's Avatar
    Join Date
    May 13 2010
    AZ Member #
    58947
    My Garage
    Q7 TDI
    Location
    SLC

    We had the airbox out today looking at it from above and below and it did not seem trivial. I didn't have the couplers at the time so we did not try to remove the top inlet or the headlight as nicely recommended above.

  6. #6
    Senior Member Three Rings 1thenaton1's Avatar
    Join Date
    May 13 2010
    AZ Member #
    58947
    My Garage
    Q7 TDI
    Location
    SLC

    Was able to dig into this this week with a local mechanic friend. We removed the airbox, headlight, top inlet pipe, supported the engine from below, removed or at least loosened the front sway bar, removed the engine mount bracket and the engine mount and that gave us good access to the leaking inlet.

    Here you can see the grimy inlet pipe above the motor mount



    We removed the inlet and cut off ~1.5 inches of the pipe and cleaned up the edge so nothing sharp remained.

    Got a view of the turbski, installed about 3 yrs, 20k miles, looking pretty good


    Next attached and tightened the 2.25" silicone coupler to the turbo and slid the inlet pipe back on.






    Put most of it back together and smoke tested it again, system held tight. Buttoned everything up and the car is back ripping. All in it took about 4 hours start to finish.

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    Last edited by 1thenaton1; 06-29-2018 at 04:17 PM.

  7. #7
    Established Member Two Rings TwoSnelz's Avatar
    Join Date
    Sep 09 2016
    AZ Member #
    380498
    My Garage
    2001.5 Audi S4, 1998 BMW 323is
    Location
    Northeast PA

    Thanks a lot for those pictures, I need to do this and it helps knowing what I've read actually works!
    2001.5 Cactus Green S4 - Rebuilt Motor, Frankenturbo F21s/Inlets, Gates Timing Belt, 034 Spider Hose/Rear Subframe Reinforcement/Rear Swaybar/Track Density Motor Mounts, XSPower Y-Pipe, 85mm MAF Housing, Stratosphere DVs, SSA Turboback Exhaust, JHM FMIC, Samco TBB, 550cc EV14 Injectors, Motoza 93 Tune, ST Coilovers, Rebuilt 01E, Southbend Single Mass Steel Flywheel, USP Slave Cylinder w/ Steel Braided Line, Clutchmaster FX400 6Puck Clutch

  8. #8
    Veteran Member Four Rings vavJETTAw36's Avatar
    Join Date
    Jul 04 2012
    AZ Member #
    96276
    Location
    Woodbridge, VA

    Looks good. Good fix job. My only suggestion for next time would be to make sure you get clamps with a sleeved inner liner as it helps to not eat up the soft silicone.


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