A4 bex turbo rebuild

Andy avant b5

Andy avant b5

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Hi brought a bex turbo that needs a rebuild there is a bit of play and a tiny mark on the housing where the blade is hitting it's only really small but I think it needs a rebuild was cheap so not fussed what sort of price should I be paying thanks
 
I refurbed my wastegated tdi turbo 80,000 miles ago using a rebuild kit from turbo rebuild.co.uk and although I haven't checked it for play it is still going and boosting strong. 1.5-1.7 bar gauge pressure. £30 or so. Follow pelician parts rebuild instructions and mark everything up with a scribe pointer and the balance will be kept. Depends on what you want. If your going for bigger power you will need a new wheel and balancing which will cost £40 for balancing and £70-£100 for a compressor wheel.
 
Spoken to a couple of company's most are saying from 200- 400 dependent on what needs doing
 
Do it yourself, much more satisfying. You need to check the exhaust housing isn't cracked first of all. Also if the CHRA bearings are too far shot then there is a good chance the central housing will be damaged too meaning the standard size bearings will not take the play out of the shaft and the central housing will need reworked or replaced.
 
OK I think it's a bit skilled for me I don't think .It's something you can afford to get wrong
 
I suppose that's true. Have a look at the instructions and see what you think. If not then get somewhere to assess it and build it up for you. They say a billet compressor wheel can get the turbo spooling 500 rpm earlier so should boost 500 rpm earlier as well. It doesn't sound like much but would be the equivalent of the car starting to pull hard at 40/42 mph in third gear instead of 48/50mph.

I haven't decatted any petrol engine but my diesel revs more freely and higher with a decat. So the combination of the billet comp wheel, decat and 3 inch TIP would widen the power band by 1000 rpm.
 
You sound like you know your stuff mate thanks for the info
 
Looking at getting a new wastegate what's a cheap shiny eBay one like
 
Only replace it if it's faulty. The original one will be much more reliable than ebay ones. Get a pump, a pressure gauge even a cheap one from a old broken tyre compressor would do the job.
 
Messed that last post up, sorry.

Short version is the wastegate can be tested with a pressure gauge tubing and a bike pump.

Look for smooth action, sending pressure and leaking diaphragm.
 
Tee the pressure gauge and bicycle pump to the wastegate and you can check that the diaphragm isn't leaking. The opening pressure were the rod moves the wastegate arm can be observed and the motion of the arm can be observed in that it's smooth and not restricted or jerky in any way as the response could compromise the boost control.
 
I've been a bit busy of late and my Quattro is off the road frustratingly I have not been able to look at her for other meaningless but none the less necessary tasks needing attended to.

I have a spare k03 exhaust manifold and an old shot k04 exhaust housing which I am going to get an engineering company near me to see if they can weld together and if it's a really good job then I'll buy a new k04 housing from turbo rebuild and get them to do a proper version and build up a k04-023 for the Quattro. Then push it all the way and see what ponnies I get out of her. I have the k04 flange for the turbo downpipe as well so the exhaust shop near me can make up a custom down pipe and leave it ready for the rest of the catless system that will fit when the time comes.
 
260bhp minimum with standard exhaust and intake with a remap. That may require a FMIC which I have but not fitted yet. Solid 280 bhp with exhaust and intake done and 300bhp like westy should be doable with the full works, porting etc.
 
I'm off next week so should hopefully get a bit done like get her going and on the road at least. Then pop down to the engineering company on Friday all being well to see about the welding of the manifold and turbo.
 
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