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PrecisionAutoWorks 1.8t 20v GT28

Posted: Fri May 04, 2018 2:48 pm
by farrell15
Hi Guys

So I thought I'd post this.

Another friend bought a 1.8t 20v A3 last year. Was in decent condition.

Drove it stock for a while. And then we did a run to sun city and a the car broke.

So we decided to rebuild it and then play.

What happened was the chain tensioner wore due to probably never servicing the car as the head was black on the inside, so all the plastic bits got caught in the pick up and then ya disaster.

So we went about rebuilding it. It bent 5v, so we replaced that, I Ported and polished the head and gas flowed. Rebuild the Ko3 and did all the other parts that needed replacing.

And with that the car was up and running.

We also change the cam chain tensioner from hydraulic to manual. As well the vacuum delete. As well as a joey mod.

I then started mapping the car, Anti lag, over run, hard limiter and so on pushed the boost to .8 bar but whenever it would get higher in the rpm the car would pull timing hard, and hesitate even on stock map, couldn't figure it out. Replaced coils, plugs, maf, lamada, and and and eventually after making sure air and spark where not the colprit we did the fuel pump and sorted. Car was running like a monster.ImageImageImageImageImageImageImageImageImage

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Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Fri May 04, 2018 2:52 pm
by farrell15
More pictures. There was a lot of pictures taken but over time I've misplaced some.ImageImageImageImageImageImage

Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Fri May 04, 2018 3:07 pm
by farrell15
So... the car was running perfect.

Not sure what happened but hit the hard cut limiter and all of a sudden no power car cuts out. Like the cam belt snapped. However it was a brand new cam belt so I knew it wasn't that. Towed the car back. Turned the motor swung fine but no firing.

I new it was valve train related could just here no compression. So compression tested, 3 cyclinders were fine one was low.

Open the tappet cover and low and behold the exhaust cam snapped on cylinder one.

So we set about stripping the head off again and checking for valve damage and piston damage.

3 bent valves. Nothing else.

So made missions got a set of s3 cams from a guy in durbs. Then we decided on a new turbo set up. Gt28 with external gate.

So the work began

Will add more pictures later ImageImageImage

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Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Fri May 04, 2018 3:42 pm
by ZiF_k
Another BT build! Nice to see more of these around these days.

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Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Fri May 04, 2018 3:55 pm
by dcmk4
Quite a bumpy road so far, do you have any idea what caused the camshaft to fail like it did?
Good luck with that new route however, should be a handful.

Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Fri May 04, 2018 5:37 pm
by farrell15
DCmk3 wrote:Quite a bumpy road so far, do you have any idea what caused the camshaft to fail like it did?
Good luck with that new route however, should be a handful.
Yeah look, the price he got the car for and the people im not surprised about the stuff.

And the plan was to build a project car so yeah.

My best guess was from the previous lack of oil supply and the anti lag and heavy bangs on these valve trains are alot of strain. But the cams were not in great shape either. ImageImage

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Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Fri May 04, 2018 5:45 pm
by farrell15
We discussed a normal even length tubular manifold.

Then decided if we going big turbo we go with a different kind of mani so I made something different. ImageImageImageImageImageImage

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Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Fri May 04, 2018 6:18 pm
by Ashveer03
Fabrication works out so smoothly with pie cuts.. nice welds bro

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Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Sat May 05, 2018 9:29 am
by farrell15
Ashveer03 wrote:Fabrication works out so smoothly with pie cuts.. nice welds bro

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Thanks man.

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Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Sat May 05, 2018 9:30 am
by farrell15
So last night got the timing done and fitted the new cams aswell as finish all the new oil and water lines.Image

Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Sun May 06, 2018 9:15 pm
by PapaJo
Very good job and great updates and upgrades.

Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Mon May 07, 2018 7:23 am
by Stu
very nice

Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Mon May 07, 2018 2:31 pm
by MarshallGTi
keen to hear what this sounds like at full tilt

Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Mon May 07, 2018 2:36 pm
by PapaJo
Watching these updates with some popcorn.

Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Mon May 07, 2018 7:17 pm
by Unobeat
What an epic build, loving this build.

Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Sun May 13, 2018 12:09 pm
by farrell15
So I've been in durbs the past week and a bit.

Got some graft done on the car yesterday.

Cars is fully running, turbo is in, all the lines are done, timing is spot on, no oil leaks or water leaks, car starts first turn, got a video of start up with no exhaust just down pipe so sound is a bit rough will post it when I get a gap.

Finished up on the cold side boost pipe all purged, need to finish the hotside boost pipe and new recirculating/blow off valve then the rest of the exhaust at the rear and finish the 100mm aluminium intake then the car is complete. Air fuel gauge is also fitted and working.

Didn't take much pictures as we still cleaning up vacuum lines and so on will try snap some. We car also going to redo the catch can lines at some point. ImageImage

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Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Sun May 13, 2018 12:18 pm
by farrell15
A few more shots.

Excuse the engine bay shot quality not so great and still got line to sort out and odds and ends. But it's getting there. ImageImageImageImage

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Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Sun May 13, 2018 1:09 pm
by PapaJo
Like the update.

Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Sun May 13, 2018 11:36 pm
by seleb
In for updates...

Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Wed May 16, 2018 2:42 pm
by farrell15
Thanks alot for the comments guys. Sorry I can only update now and then. Time is not my Ally.



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Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Wed May 16, 2018 2:48 pm
by farrell15
Only update I have for now that I took pictures of was the hotside boost pipe is almost complete. All mocked up and half way welded all purged.

Need to weld in the fitting for dump / recirculating bov.

Also intake is almost done it's not exactly how I want it but until we battery relocate then it will have to do. I am keeping maf and just going to rescale it. I'm not a fan of speed density on me7.

On to the last little bits and pieces.ImageImage

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Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Thu May 17, 2018 7:32 am
by Unobeat
Awesome work on the car and loving those welds.
They look tops.

Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Thu May 17, 2018 4:18 pm
by PapaJo
Unobeat wrote: Thu May 17, 2018 7:32 am Awesome work on the car and loving those welds.
They look tops.
:iagree:

Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Thu May 17, 2018 5:02 pm
by farrell15
Tack plates with my company logo
Image

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Re: PrecisionAutoWorks 1.8t 20v GT28

Posted: Fri May 18, 2018 11:39 am
by Tman21
Kak Lekker!