20VT Exhaust Studs

[afen]

I'm about to send my turbo in for refurbishing, and while I'm at it I thought I could get new bolts all around. I already have a set of manifold bolts, but I want to buy new bolts for the turbo and wastegate. Called the local stealers, and of course they want an arm and a leg for these, so I'm not going to buy from them out of principle.

Tried looking in ETKA, found the studs, but with an idiotic description. M10FOX25, wtf?

Are there anyone out there with a caliper and these bolts that could take some measurements for me? I need the measurements for the turbo->downpipe, turbo->manifold, wastegate->manifold and wastegate->downpipe bolts.

[Sleeper_Avant]

if nobody has done this by tomorrow i will measure my manifold, wastegate is off already.

Sean.

[UrS4boy]

..Tried looking in ETKA, found the studs, but with an idiotic description. M10FOX25, wtf?

Item 5?

http://forums.quattroworld.com/s4s6/msgs/196904.phtml

[Greg_S]

If you are fitting an RS2 manifold I think there are two different size studs used. You certainly dont have to use the Audi items as they are off the shelf type studs.

[afen]

Item 5?

http://forums.quattroworld.com/s4s6/msgs/196904.phtml

That's correct. I tried contacting a local dealer that prides itself in getting every bolt imaginable, but even they didnt't know what I was talking about!

[Pat D]

I was told anything with a N before the part number means it is non specific to Audi, so should be a commonly available part.

I found this online: Fo = Studs without interference fit thread (DIN 962). (Not sure what that means exactly)

Page 19 http://www2.boellhoff.com/web/centre.../MoFT_8100.pdf





I think a standard m10x25 stud with a continuous full thread sounds like it?

[UrS4boy]

If you are fitting an RS2 manifold I think there are two different size studs used. You certainly dont have to use the Audi items as they are off the shelf type studs.

The exhaust manifold to head studs are item 9 below (PN starts with N = common across many Audi models/engines). Typically only cost $2 (ish) each. 16 needed, four of which need to be shortened to install and RS2 Exhaust manifold (as shown in the link):

http://forums.quattroworld.com/s4s6/msgs/196904.phtml

[Sleeper_Avant]

doesnt matter

[afen]

Got a reply on the Norwegian VW-Audi forums:

4 x M8x50 studs manifold -> wastegate
3 x M8x30 studs wastegate -> flex pipe
3 x M8x30 hex head bolts flex pipe -> downpipe
4 x M10x40 studs turbo -> downpipe
4 x M10x35 studs turbo -> manifold

Does this look alright?

[Greg_S]

That sounds quite sane from memory

[afen]

I've finished this job, and I used M10x38 studs for both EM->Turbo and Turbo->DP, worked fine.

Got a friend to make the wastegate bolts for me, out of SS316. Still came out cheaper than the stealers!
Measurements:
8mm thread, 8mm spacer, 14mm thread for WG->flex pipe
9mm thread, 29mm spacer, 29mm thread for WG->EM