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Audi UR Quattro Rally Build

Old 10-17-2018, 05:53 AM
  #41  
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TIRES

It’s time to start thinking about wheels and tires. Well, it’s a bit early but a) we are obsessed about wheels and tires and b) this project is as much about showing off our BRAID wheels as anything. At least that’s how we justify it.

You may recall we previously purchased a set of BRAID Serie 6 in 16x9 and mounted some 245/45-16 Bridgestones on them.



This size combination seems to be typical of what people run on these tribute cars but we ordered them way too soon (obsessed remember) and another build needed them for their project so we let them go. We always thought we would order up the exact same thing again at a more sensible phase of the project. Then we saw this:





And we knew what we had to do.

We have always loved the Michelin TB15s as we sell hundreds of 911 wheels for them and they look just perfect on those RSR recreations, but we never thought we’d have a car suitable for them as the sizes they come in are either too narrow or too wide for anything we have. Or so we thought. It turns out that back in the day at least some Quattros were running the 23/59 - 15 TB15s (about a 270/40R15) so we knew they should fit on our car too. Unknown though is at what offset and rim width. Michelin only make the 23/59 – 15 in a TB5 now so we ordered up a TB15 in 23/62 – 15 from Coker tire on the condition that we could return it if we didn’t mount it. Specs for the tire are:

Section width: 10.6”/270mm
Tread width: 9”/229mm
Diameter: 24.6”/625mm
Rim width: 8.5”-10.5”
Measured rim: 9”

Unfortunately we had nothing similar in the shop to test with; or so we thought. One of our customers keeps his 944 Turbo race car in the building and it runs Hoosiers in 275/35R17. The specs on those: are

Section width: 11”/279mm
Tread width: 10.3”/261mm
Diameter: 24.7”/627mm

So just slightly larger than the TB15, apart from tread width which is quite a bit larger. We had us a surrogate.



Now some of you might point out that a Porsche 944 is not going to bolt up to a Quattro. Well normally that’s right but we have some hub adapters that allow us to bolt a set of 911 Safari wheels to our Audi Allroad so we employed one of those in our test fit. The 944 wheel, which coincidentally is a BRAID Serie 6, has an offset of 55. Our hub adapter is 27 and we also have some 18mm spacers. That makes the resultant offset of the test setup et11, right about where we anticipate our new wheels need to be. Time to find out.



The Hoosier cleared the strut but kissed the tie rod ball joint. Not to worry, The TB15 is not as wide at that point so should clear.



On full lock and full compression the Hoosier barley kissed the rear inner fender. OK, same as above, the TB15 should clear.



Lots of room under the front fender too:





So with the front suspension in its worst orientation (full lock and full compression) the big Hoosier almost fit. We were so happy as we came away very confident that the smaller TB15 would have no issues. Still, we best throw it on the rear just for fun right? Uh oh! What’s this?



Lots of interference with the rear arch. Who would have thought? It only has to go up and down. It might fit if we tucked it in a chunk and hacked the arches up but then it might rub on the front inside and look odd. We concluded the overall diameter of the Hoosier and the TB15 precluded us from using the TB15 on this car. What to do? Well, remember the picture we found showed a much smaller diameter 23/59 -15? That size is available in a TB15 which might even be a better tread pattern for us anyway. So we returned the TB15 and ordered up Coker’s last set.



And mounted one on a 15x9 Porsche Serie 1 we had on display to see if that width would fit it well.



It would probably be happier on a 15x9.5 or even a 15x10 but by going with 15” we have somewhat painted ourselves into a corner, in that there aren’t any other 15” tires this wide available and who knows how long the TB5 will be around. By restricting ourselves to a 9” wide rim we have at least left the door open to some currently available and suitable 245 or even 225 tires. Hopefully we never need to go through that door.

So the next big issue to resolve: what 15x9 BRAID wheels to order to mount these on? Her are the candidates:

https://braidusa.com/collections/whe...5-x-112+15-x-9

What would you choose?
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Old 11-09-2018, 07:49 AM
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Installation was relatively simple as we kept all the hardware.



Then we remembered that we also have a broken reflector which we thought would be better used on this car rather than the pristine one that came off it as we are going to be wrapping it anyway a la Rothmans livery:





But how to fix the crack? It can be unsightly but has to be smooth as any hint of a crack will show up through the vinyl film. Fortunately one of our guys has a lot of experience with plastic adhesive and managed a nearly invisible repair.





Now we have to figure out how to wrap the black side pieces. As they have horizontal grooves running along their lengths they won't take vinyl very well. We could try to paint them but it might not match the vinyl and we'd be ruining a set. We have considered filling the grooves with body filler and sanding them flat. That would wrap easily but we'd still be ruining a set. Currently considering making new filler panels. Fortunately we don't have to decide for a while though.

(BULKHEAD)
More rear of the car projects. Another piece (two actually) that would be better stored in the car is the rear bulkhead. It comes in two parts: a lower and an upper. The upper part is essentially a parcel shelf as it is mostly horizontal but is definitely not flat. No parcels will be stored here. We think this will be just a test fit as it may be in and out a lot in the course of the build, though it will be going to paint with it fully installed. It will definitely need to come out to allow us to clean up the aperture edges. Looks like that was cut with a torch.

Both pieces clearly needed to go through the side window openings. The lower panel fell into place without much trouble.



But the upper one fought us hard. We even called the cage builder and the body shop; the last people to mess with it but they couldn't remember how they did it. At least we now had the confidence to know that it does fit so we continued to jiggle it around and look for a way in. This seemed like the way it wanted to go but it wouldn't slide any further back.





Eventually we sort of curved it as we slid it down the cage bars and then it fit nice and snug.







Now we have to get it out again!

(DASH)
Work continues on the dash, bit by bit. We bought an old rally computer that came off a Rothmans car in the middle east. It has no internal parts but we have another one that does and that may find its way into the car eventually. For now this one is easier to install.









Then we thought we'd have some fun.



We just need to repaint one of the 911s and get a Rothmans Quattro model (on order) and we'll have a perfect set!

FUEL TANK
While we seem to be working on the rear of the car we thought we'd throw in the fuel tank. It's big and takes up a lot of space on the parts shelf. What more rationalization do you need. Oh, we also want to see where the fuels lines exit the trunk area so we can figure out where to locate lines, pumps and filters etc.



It was a bit awkward to wrestle into location, but soon cooperated.







The fuel lines protrude through the trunk floor. Perhaps we can extended them through the lower rear bulkhead and mount the fuel pump/s in the cabin.
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