just wanted to say a big thanks for this website.ive got a oct diesel 110 bhp.i had lack of power.and whossing noises.after reading many turbo threads.i decided at the weeknd to remove it and strip it then clean it and rebuild it.and oh my goodness what a difference.its a whole new car so much faster than before and i didnt think it was that bad.

i reckomend any one to do it.so easy and very rewarding.

keep up the good work

Is that 'easy' to do then? Thought it could be quite a precise job?

Good job in any case

Well done!

I used to work as an applications engineer for a turbo manufacturer and just a word of warning...... Turbo's run on a very fine setup, with the shaft 'floating' on a film of oil, tens of microns thick, both axially & laterally. Any kind of imbalance can cause you severe issues & could write your turbo off the first time you start it.

So i'd suggest if you are the kind of person who may do a half @rsed job, you'd be better leaving well alone.

Personally i wouldn't touch mine

I'm guessing as to exactly what fab-vrs means, but the TDi110 has a variable geometry exhaust inlet. These are notorious for accumulating carbon dust and getting sticky if not "regularly exercised" (so I'll be pretty safe there then).

I've not done mine (well not yet anyway), but this job does not involve dismantling the turbocharger, just removing the cover from the exhaust turbine and cleaning the movable stator vanes.

I'm guessing as to exactly what fab-vrs means, but the TDi110 has a variable geometry exhaust inlet. These are notorious for accumulating carbon dust and getting sticky if not "regularly exercised" (so I'll be pretty safe there then).

I've not done mine (well not yet anyway), but this job does not involve dismantling the turbocharger, just removing the cover from the exhaust turbine and cleaning the movable stator vanes.

All the TDI engines after the 90BHP have the VNT turbo, including the 1.4. There's a documented rebuild procedure for this on Fred's TDI Page. TDIClub.com. VW TDI Enthusiast Community. Interestingly, Turbo Technics say the VNT should not be stripped and rebuilt, but then they would, wouldn't they?

If it is a VNT then its even more of a reason not to take it apart, because if you dont know what you are doing you can inadvertently adjust the revs at which the turbo balances itself, as you are talking about over 100 moving parts. Bad setup could cause over / under boost, letalone the damage you could do pishing about with the bearings.

If it is a VNT then its even more of a reason not to take it apart, because if you dont know what you are doing you can inadvertently adjust the revs at which the turbo balances itself, as you are talking about over 100 moving parts. Bad setup could cause over boost.

This is a bad thing in a diesel why?

If your revering to over / under boost then surely your engine map wont be able to control the engine to its optimum if this is changed

Yes and no; a standard map plus overboost should leave you running slightly leaner than usual, but anywhere below full throttle I'd expect a TD to be running lean anyway.

As a point of fact, I'm not aware of anyone who's lost power by cleaning a VNT.

Thats fair enough, but all i know is i would'nt touch mine just because of the risk going wrong

We've done a few at work without any problems whatsoever. You are not actually touching the turbo, only cleaning the soot and rust off and freeing up the variable vane mechanism which is all housed in the exhust manifold.

All the TDI engines after the 90BHP have the VNT turbo, including the 1.4. There's a documented rebuild procedure for this on Fred's TDI Page. TDIClub.com. VW TDI Enthusiast Community. Interestingly, Turbo Technics say the VNT should not be stripped and rebuilt, but then they would, wouldn't they?

tried to find "Freds TDI page" but couldn't, please can you post a better link , thanks

The link took me to the home page; couldn't find the article on cleaning the VNT which used to be there (under articles IIRC) though.

Got one here Stuff from Kev obviously not from Freds stuff but you`ll get the idea

There`s also a superb PDF how to that you can open and save from tdiclub here

http://pics.tdiclub.com/data/500/Drivbiwire_VNT_repair_procedure_small.pdf

Im in the middle of cleaning out my VNT turbo and EGR/inlet manifold at the moment the crap that's in there is unreal

its no wonder it wasn't breathing very well and the turbo looks like an un brushed chimney

Ill supply some pics of before and after when im done

As stated you don't need to go anywhere near the rev/boost adjustment on the unit so its very safe to do if you

are fairly competent with tools and motors