1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Any ideas on getting a bit of downpipe / prop shaft clearance

Stuart B Dec 8, 2018 at 3:08 PM

  1. Stuart B

    Stuart B Well-Known Member

    3,137
    677
    113
    This downpipe fitted my s3 perfectly. I have undone the downpipe to ensure it is rotated as much as possible 1mm movement.
    Are the engine mounts different? Eg length of dog bone? (As I fitted my S3 dogbone mount with its yellow power flex upgrades) I think if the dog bone was 5mm longer that would bring the downpipe down to clear. Or I remove downpipe and lengthen the holes?

    Thanks :)

    Screenshot_20181208-150711_Gallery.jpg
     
  2. Avatar

    Google AdSense Advertisement


  3. Stuart B

    Stuart B Well-Known Member

    3,137
    677
    113
    What about?

    1. I changed the thiming belt the engine mounts have a tiny bit of movement - could this be the difference?
    Or
    2. Chinese hotside incorrectly located studs?
     
  4. desertstorm

    desertstorm Moderator Staff Member Moderator VCDS Map User TDi Audi A4 Audi Avant Owner Group quattro

    6,662
    3,172
    113
    I wouldn't be surprised if the Chinese hotside wasn't helping matters. You seem to have a lot of balance weights on that prop. I have a small one that caused me some issues. The downpipes for the S3 and TT are made to be the same. I am not sure if the dogbone mount length is the same on the TT and S3. They have different part numbers. The bushes may be interchangeable but possibly the overall length is different.
     
  5. superkarl

    superkarl MAN OF STEEL

    9,880
    2,587
    113
    Did you check the height of the hot side was the same as oem? I.e. from CHRA side to the downpipe flange face?
    If it was thicker it would move your downpipe over to the drivers side and contact the prop like that.
    There might be very minimal movement left-right on the mounts so try that.
     
  6. Stuart B

    Stuart B Well-Known Member

    3,137
    677
    113
    Made a bad assumption in the hot side. Its the manifold which determines the position of the downpipe via the hot side so not sure where the CHRA is involved?

    I will have a look at the mounts I maybe able to slightly twist the engine, moving the engine towards the bulk head tilt it enough.

    Aftermarket dogbones are for S3 and TT but I will give it a check. Just in case it is a tiny difference.
     
  7. superkarl

    superkarl MAN OF STEEL

    9,880
    2,587
    113
    The CHRA isn’t involved. You have a Chinese hot side in there. Is the thickness of the hot side the same as OEM, from CHRA side to the flange side? If the flange is thicker for example, this will move the downpipe drivers side like I say.

    Equally it could be the manifold. Although I don’t recall any Ill fitting downpipes because of Chinafolds, but it shouldn’t be ruled out

    I’m just speculating here
     
  8. Stuart B

    Stuart B Well-Known Member

    3,137
    677
    113
    The pipe is too high, moving across the drivers side will hit the other side of the channel. It needs to move down like rotate to 7:30pm instead of 8pm ( if you know what I mean,) although I could rip off the heat sheild if need be.


    To try and manipulate the engine a tiny bit.
    1. I've soaked the passengers mounts with wd40 and will continue all week, these are famous for snapping as never being touched unlike timing belt side,

    2. my neighbour is making me a 4mm spacer / shim for the dog bone it helps a tiny bit but the prop shaft moves with it too, so there's a sweet spot

    3. I am taking the downpipe off the turbo and going too try to slot the holes whilst still floating around in the wheel arch to position it perfectly. Rather annoyingly the locking nuts simply undid the studs from the turbo.

    What I did notice in the red charge pipe tiny silver flecks? Too small to pick up I should have tried to photo them. But I would like to know where they came from. Obviously, I've only driven 4 miles up to ~3k rpm just when the turbo started coming in. The compressor span freely so pretty unsure of the source of these.

    One thing s3 versus tt regarding engine fitment which may impact this is, it's really difficult to fit the top thinking cover on the TT without breaking it on the s3 you just wiggled it down the TT doesn't have the same amount of space, and that's not just me.
     
  9. xDaNx

    xDaNx Member

    71
    12
    8
    Probably chinafold, mines the same, exhaust knocks and rubs on the side of the exhaust tunnel
     
  10. hendo#1

    hendo#1 Active Member

    286
    96
    28
    Same here, chinafold.

    Although nothing near as bad as yours
     
  11. Stuart B

    Stuart B Well-Known Member

    3,137
    677
    113
    thanks well we will see how it can be improved - thats the problem with changing so many things in one go.

    now I just need to grow the balls to redo up the timing engine mounts. I think the slotting of the downpipe and the spacer will do the trick and will post up the pics.

    I couldn't leave it, it will either knock off the balance or go through the flexi-pipe.
     

Share This Page