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Audi UR Quattro Rally Build

Posted by BRAIDusa 
BRAIDusa
Paul Eddleston
Mod Moderator
Location: Birmingham, Michigan
Join Date: 09/06/2012
Age: Possibly Wise
Posts: 456

Rally Car:
Subaru Outback Wagon EG33, 911 Carrera



Re: Audi UR Quattro Rally Build
March 29, 2019 11:35AM
BRAKE MASTER CYLINDERS

We decided some time back that this car would dispense with the hydraulically powered brakes and employ dual master cylinders with a bias bar adjuster but were never quite sure how we'd accomplish that. Then a friend turned us on to Compbrake in England who have a bolt-in kit for the Quattro. How could we say "no"?

So we ordered one up and it arrived in just a few days. Seems to be very comprehensive. It even has a bracket and lines for remote reservoirs.





The first job was to figure out how to mate up its four bolts with three on the bulkhead. It was seemingly not as "bolt-in" as we'd hoped. We made a template and transferred it to the car and immediately discovered that the four required holes would interfere with the pedal mounts. Something did not seem quite right.







Then a gentleman and fellow Quattro rally car builder called Frank pointed out that the kit is designed to bolt to the OE brake booster not the firewall. He also highlighted how far into the engine bay this would make the assembly protrude because he had installed one himself. However, he had engineered a solution by way of an interface ring that was only about an inch thick rather than the 5"-6" of the booster. A few more emails and some PayPal and one showed up at our shop.



This made all the difference and we were able to mock it all up in short order:







We then set about making it look nice by trimming it and painting it:









Frank also included some DOM tubing to replace the 5/16" threaded rod that came with the kit as this linkage was going to end up quite long. The DOM would be much stiffer and didn't take much work to cut it to the correct length, thread it and attach a couple of short, threaded rods to each end. We will probably have this assembly plated before the too long.





And here it all is installed. We attached the reservoirs directly to the cylinders for now as we don't yet know where everything else is going. The Group B cars had them mounted to the strut bar but we are not that particular. We'll see what seems the best location later in the build.







Next on the list is engine prep. Look out for that one soon.



Paul Eddleston
BRAID Wheels USA www.BRAIDUSA.com
Team Illuminata Motorsport www.teamilluminata.com
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BRAIDusa
Paul Eddleston
Mod Moderator
Location: Birmingham, Michigan
Join Date: 09/06/2012
Age: Possibly Wise
Posts: 456

Rally Car:
Subaru Outback Wagon EG33, 911 Carrera



Re: Audi UR Quattro Rally Build
April 09, 2019 12:36PM
ENGINE Teardown

Well, this is a big step forward for the project. It’s time to take the engine off its pallet and get it into the car. Of course it is not that simple. We have lots of ways to make it complicated.



As we’ve previously discussed, we decided to go with a fairly stock later AAN 20 valve engine rather than try to wring extra power from the original 10 valve that came with the car. We should be able to see 300hp from this without creating a stressed out monster nor breaking the bank. Purists may scoff but they aren’t paying the bills.

We sourced this one from Marc over at EFI Express. They are huge Audi fans and know a lot about these engines. This is a tested and resealed, good engine, basically ready to bolt in. Marc chipped the ECU and stripped the harness of all unnecessary body wiring.

However, our aesthetic bar has been raised somewhat over the course of the build so now we feel we need to strip it down externally and clean, paint a re-plate every last nut and washer. We will try to restrain ourselves however. It’s just an engine and this is supposed to be a rally car. Let’s see how this goes.

First step was to get the thing in the air and on to our engine stand but before we could do that we wanted to remove the clutch and flywheel. This revealed a new crankshaft seal as expected but a bonus stage 3 CenterForce clutch that looked like it might even be serviceable. Thanks Marc.









We were always going to have to replace or modify the intake manifold as the stock location of the throttle body will interfere with our side mounted radiator, so we started dismantling the intake side of the engine first. Getting at the ten Allen bolts that held it on was a big PITA. It would have been easier if we’d realised there are access holes going through the manifold before we started rather than after we’d finished DOH!









We also needed to delete the AC compressor so the belt and all the ancillaries came off.







Unfortunately we decided the idler and belt tensioner pulley bearings were both near the end of their useful life so we’ll add those to the list of refurbishments.

We also discovered our engine came without the front engine mount; the one that stops it moving up and down when you get on the gas, so we’ll have to source or make one of these.



We are also going to need some different senders and sensors to drive our non-stock VDO gauges. At least they’ll be clean and shiny.



We believe the turbo is good and are reluctant to open up this rabbit hole so we think we will just clean up the exhaust side in situ. Let’s see how that goes.





So check back later to see if we manage to not replace, repaint or re-plate every last piece of this engine.



SIGNATURE




Paul Eddleston
BRAID Wheels USA www.BRAIDUSA.com
Team Illuminata Motorsport www.teamilluminata.com
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BRAIDusa
Paul Eddleston
Mod Moderator
Location: Birmingham, Michigan
Join Date: 09/06/2012
Age: Possibly Wise
Posts: 456

Rally Car:
Subaru Outback Wagon EG33, 911 Carrera



Re: Audi UR Quattro Rally Build
April 24, 2019 04:08PM
WHEELS

Halfway through our engine tear down our new wheels showed up. Yes, they did distract us.



We chose these from BRAID’s catalogue because they look very similar to the BBS wheels the Rothmans (and some others) rally Quattros ran back in the day. Look:



Specs are:
- BRAID Serie 4 RC
- 15x10
- Et0
- 5x112
- 57.1 center bore

As far as our research suggests, the same as the originals.

Of course we took lots of pictures.











Then, we installed a couple of our TB5 tires to make sure the wheel and tire package would actually work.









Nailed it!



In case you weren’t paying attention earlier these tires are Michelin TB5 historic tarmac rally tires in size 265/40-15 and are just 23.3” overall diameter. Again, the same size these cars ran in period, at least in tarmac trim.

Next week back to the engine, we promise.





Paul Eddleston
BRAID Wheels USA www.BRAIDUSA.com
Team Illuminata Motorsport www.teamilluminata.com



Edited 1 time(s). Last edit at 04/24/2019 04:10PM by BRAIDusa.
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BRAIDusa
Paul Eddleston
Mod Moderator
Location: Birmingham, Michigan
Join Date: 09/06/2012
Age: Possibly Wise
Posts: 456

Rally Car:
Subaru Outback Wagon EG33, 911 Carrera



Re: Audi UR Quattro Rally Build
May 15, 2019 10:51AM
We promised you an engine-based post this week so here you are.

As we mentioned in an earlier post we were supposed to just bolt this in but have recently gotten carried away with cleaning and polishing everything on this car so let's see how nuts we can go with an engine. Is there therapy available for this stuff? We need help.

So we started by painting the block, even though nobody will ever see it once it's in the car. It's not like it didn't have paint on before. Jeez!



Then we turned our attention to refurbishing the cluster of accessories we previously took off.

We decided to reduce the size of the AC and alternator bracket as we are deleting the AC. We could have just found a non-AC bracket but they were expemsive and all in Europe because Americans can't drive without the windows up (electric) and the AC on.



We couldn't make ours quite the same shape but we did cut a sizable chunk off the rear:





The idler pulley bearing was noisy and NLA so we just replaced the pulley with a GM something or other.



About the same size but has the bearing in the pulley like a normal one not inside the bracket like an Audi one. Consequently some re-engineering was required.





It turned out pretty nice, if that's not a pun.



We also blasted and painted the engine mount brackets because, well, we're sick. Next week we'l probably paint something else; maybe gold! Stay tuned.





Paul Eddleston
BRAID Wheels USA www.BRAIDUSA.com
Team Illuminata Motorsport www.teamilluminata.com
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BRAIDusa
Paul Eddleston
Mod Moderator
Location: Birmingham, Michigan
Join Date: 09/06/2012
Age: Possibly Wise
Posts: 456

Rally Car:
Subaru Outback Wagon EG33, 911 Carrera



Re: Audi UR Quattro Rally Build
7 days ago
ENGINE REFURB 2

We know, engine stuff. (Focus TIM). But look what arrived this week!



We could have just tried to convince you that we had a surge of enthusiasm and finished the car but that wouldn't be right.

We did paint something though, as promised:



Gold too!



and red!



We also had a go at cleaning up the oil pan. It's not obvious in the pictures but it did make quite a bit of difference.





Enough that we think we might want to have another go at the transmission case with this stuff.

The last thing we worked on this week is only peripherally related to the engine but, as we were about to send a load of parts to the platers we wanted to include the power steering lines fittings. This is the 83 URQ's lines and oil tank along with the AAN's pump. The gap on the lower run is where the accumulator would go for the power brakes but as we are not using power brakes we can dispense with that. That means we need to come up with one continuous high pressure line and also some fittings for the pump end.



We sourced a high pressure line from a servo boosted car as it's fitting routes better around the steering rack because it does not have to go first to the accumulator. Then we cut out all the fittings and sand blasted them ready for plating.









Paul Eddleston
BRAID Wheels USA www.BRAIDUSA.com
Team Illuminata Motorsport www.teamilluminata.com
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