A4 b5 turbo replacement 1.8t

Andy avant b5

Registered User
Hi everyone going to replace my turbo with a bex turbo just how hard a job is it any advice tips or a step by step guide would be much appreciated hopefully it's something I can do I am no mechanic but have changed breaks on it serviced it fitted coliovers so am OK with a set of spanners lol
 

aragorn

"Stick a V8 in it!"
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Buy new bolts for the turbo, the old ones will often snap when taking them out. You will need new gaskets too, for the manifold, turbo and downpipe.

You'll need a good toolkit, theres a few awkward bolts to get at, including the ones holding the downpipe/cat on.
 

QuattroCalum

Registered User
You don’t need to touch the downpipe, just remove the three cat nuts and once you have the turbo free slide it forward and off the cat. For the bottom nut on the cat I cut a 17 mm spanner in half,
put it on the nut and slide another ring spanner over the end and pull it up. Sometimes the nut will slacken off and sometimes the nut and stud come off together.
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I’ve never replaced the manifold gasket or the manifold to turbo gasket with zero problems but I would replace the turbo to cat gasket though
This is a job I’ve done lots of times so any problems just ask.
I finally got a larger exhaust manifold so I hope to be changing that soon.


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QuattroCalum

Registered User
Well I don’t know but it’s certainly bigger than the one I have, it’s off a B5 1.8 t but might have been an aftermarket upgrade.


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QuattroCalum

Registered User
Remove airbox and turbo inlet pipe, oil and water feed pipes, three bolts to turbo and three nuts to catalytic converter. Go easy with turbo bolts, use plus gas or similar and undo them when there’s still heat in them.
Now from underneath remove oil drain to sump pipe and the water return to block pipe, that should leave the turbo support bar and it should be free after that.


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QuattroCalum

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Fingers crossed it will make a noticeable difference.


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QuattroCalum

Registered User
Luckily you don’t have SAIP, so it’s easier. It’s


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QuattroCalum

Registered User
Secondary air injection pump, for emissions. It pumps air into the exhaust manifold on start up to heat the cat up quicker.


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QuattroCalum

Registered User
Just the standard one but I’ve opened up the hot side with a tungsten carbide burr. Will probably refit the spare hot side when I get the other manifold on and see how it goes. Need to get the broken bolt out of it first though.


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QuattroCalum

Registered User
B6 mate, had a B5 with 1.8 n/a a while ago.


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QuattroCalum

Registered User
Brakes were lethal, like a light switch but once used to them they were


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QuattroCalum

Registered User
Mine are 312 not sure if it’s standard on quattro?


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QuattroCalum

Registered User
I’m guessing you haven’t fitted your BEX exhaust manifold yet Andy?


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QuattroCalum

Registered User
No not yet waiting on the turbo got the injectors too

If you change it now then it will be easier when your changing the turbo as you’ll have tackled the three manifold to turbo bolts.


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QuattroCalum

Registered User
I would, will give you some benefit till you source a turbo. I’d be interested to see side by side comparison of the manifolds.


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Andy avant b5

Registered User
I wish I had a quattro front wheel drive is not good this time of year I think once I get 240bhp could be a handful in the wet does anyone recommend some good tyres for the front is there any downside to a quattro over a front wheel drive
 
Last edited:

QuattroCalum

Registered User
Not 100% on B5 but B6 is bolt on conversion if you can get rear subframe, diff, propshaft and gearbox, downsides, a little thirstier other than that, hell no


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aragorn

"Stick a V8 in it!"
Staff member
Moderator
VCDS Map User
On a B5 the rear floorpan is completely different, simply not feasible to convert.

You should have good tyres all round. Otherwise you'll end up in a hedge backwards.

Goodyear Eagle F1's are my preferred option. They're at the cheaper end of the premium brands, perform extremely well, and also last a good time.
 

Andy avant b5

Registered User
Does anyone know if a 1.8t intercooler kit for a 1.8t cupra r will fit a a4 b5 1.8t
Don't mind doing some modifying to it but is it possible cheers
 
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