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I have the engine and gearbox out of my urs4 at the moment getting it ready for a ring trip, eg turbo upgrade from efr 6758 to 7163, clutch rebuild after it got some oil on it, breather system re design, baffled sump fitted and timing belt job. So the urq has had to take a back seat. It will be a few weeks until I get back to it.
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As a result of the increase in power the stock rear diff exploded. So I got a stock 7a diff and had it sent to jpr at Silverstone. He is building it up with a gripper plate LSD. I haven't driven a quattro with a plate LSD so it will be interesting to see how it goes.
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Stock diff removed. It seems like there was a second hole hid behind the rear mount. The spider gears are totally gone. They fell out in pieces.
Anyhow new diff fitted with the gripper LSD. I tested the car over a road where it would of spun up a rear wheel round some tight low speed bends. Not an issue now, as the car wants to power oversteer. Plan is to get back to the rolling road this Friday for some fine tuning.
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Wow - thats some dramatic failure... I had never heard of that aftermarket part though - good find if it is up to the mighty level of torque that you have.
Are you also running LSD in the front ?Paul Nugent
Webmaster http://S2central.net
Administrator http://S2forum.com
1994 S2 Coupe ABY - aka Project Lazarus
2001 A6 allroad 2.5TDi - family tank
2003 S4 Avant 4.2 V8 - daily burble
Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)
There are only 10 kinds of people that understand binary - those that do, and those that don't
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Gripper have been making plate LSD for years. Handy they are made in the UK and good to deal with. I know of a few rally men that run them in escorts etc. No I'm running a stock open front diff in the 03a gearbox and it has the fancy rear biased center diff.
What's your plans for diffs and gearboxes in the s2 paul?
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I am swayed towards RS4 (0A3) main gearbox due to its higher strength and the rear biased centre is nice. I think there is a wavetrac ATB front diff available for that. For the rear I was wondering if the RS4 rear diff could be made fit - its still open of course but would be beefier that the S2 item - never looked at one to see how much difficulty required to make one fit. The gripper item is a new option for me. If you can't easily break one then its going to be tough enough for the rest of us ;-)Paul Nugent
Webmaster http://S2central.net
Administrator http://S2forum.com
1994 S2 Coupe ABY - aka Project Lazarus
2001 A6 allroad 2.5TDi - family tank
2003 S4 Avant 4.2 V8 - daily burble
Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)
There are only 10 kinds of people that understand binary - those that do, and those that don't
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I also haven't put a moments thought to any propshaft modifications for the RS4 'box - apparently its been done before in an S2 so thats always good.
Paul Nugent
Webmaster http://S2central.net
Administrator http://S2forum.com
1994 S2 Coupe ABY - aka Project Lazarus
2001 A6 allroad 2.5TDi - family tank
2003 S4 Avant 4.2 V8 - daily burble
Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)
There are only 10 kinds of people that understand binary - those that do, and those that don't
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ABY shaft needs shortening 28mm. I’ve posted all the info on the forum before, plus my conversion kit is available to order
Good work on grenading that diff Des, was that a hard launch or just general abuse from shed loads of torque?
Interested in how you get on with the plated diff Des. I’m sure it will transform the drive, certainly the rear Torsen does. Be good to get your feedback on road manners. Did they suggest the ramp angles / preload settings I’d have you specced them?Panthero Coupé quattro 20vt
Indigo ABY coupé
Imola B6 S4 Avant
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Originally posted by Error404ABY shaft needs shortening 28mm. I’ve posted all the info on the forum before, plus my conversion kit is available to order
Good work on grenading that diff Des, was that a hard launch or just general abuse from shed loads of torque?
Interested in how you get on with the plated diff Des. I’m sure it will transform the drive, certainly the rear Torsen does. Be good to get your feedback on road manners. Did they suggest the ramp angles / preload settings I’d have you specced them?
Disadvantages just seem to be some noise when doing tight turns on tarmac, not bad but noticeable. Nothing like the noise and vibration you get when turning with the stock diff locked. I'm going to stick some temperature indicators on the caseing of the diff and gearbox to record peak temperature. After the days driving I could hold my hand on it but only just, so about 60 degrees. I'm running a full synthetic 75/90 in it. After a track day it's likely to be much hotter.
I do have a prop shaft type vibration that I need to look at. I need to get my dad to drive the car on the ramp and hold a steady 60-70 while I look around. Might need to realign the center bearing or adjust the length of the spacer I use to make the urs4 shaft work.
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Originally posted by diesel des View PostThe LSD is setup as 40 deg acceleration 60 degrees overrun ramps with 120nm preload.
Spelga would be a fun test route alright.Paul Nugent
Webmaster http://S2central.net
Administrator http://S2forum.com
1994 S2 Coupe ABY - aka Project Lazarus
2001 A6 allroad 2.5TDi - family tank
2003 S4 Avant 4.2 V8 - daily burble
Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)
There are only 10 kinds of people that understand binary - those that do, and those that don't
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On the question of heat - I found this OE bolt on heat-sink for the rear end of RS6 almost randomly - could be worth cloning if you see hairy temperatures on track.
https://audi.7zap.com/en/rdw/audi+rs.../5/500-500010/
I was trying to see if other beefy 37/9 rear diffs existed that might be easier to source than OE B2/B3/B4 style - whether they can be easily accommodated on a B2/B3/B4 subframe is another matter, but that kind of fabrication for custom bracketry is easier than sourcing increasingly rare B2/3/4 rear ends.
Seems like things like the B7 RS4 run such an open diff and would be capable of high torque levels. There are ATB & LSD upgrades available on them too. Seems like they have no locking mechanism either (unlike the B2/3/4 generation) as there is external electronic involvement with EDL trickery by way of ABS controller momentarily braking the slippiest wheel so that torque can transfer to the other side.Last edited by S2central.net; 22 May 2018, 16:24.Paul Nugent
Webmaster http://S2central.net
Administrator http://S2forum.com
1994 S2 Coupe ABY - aka Project Lazarus
2001 A6 allroad 2.5TDi - family tank
2003 S4 Avant 4.2 V8 - daily burble
Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)
There are only 10 kinds of people that understand binary - those that do, and those that don't
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Like this one - there is actually a C5 RS6 rear diff on Ebay.ie right now - it is 37/9 but the mount points look different to me compared to B2/3/4Attached FilesPaul Nugent
Webmaster http://S2central.net
Administrator http://S2forum.com
1994 S2 Coupe ABY - aka Project Lazarus
2001 A6 allroad 2.5TDi - family tank
2003 S4 Avant 4.2 V8 - daily burble
Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)
There are only 10 kinds of people that understand binary - those that do, and those that don't
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Originally posted by diesel des View PostThe diff exploded when demonstrating a launch with my dad in the car. I really should of had the diff locked I suppose. The LSD is setup as 40 deg acceleration 60 degrees overrun ramps with 120nm preload.
If I grenade my rear Torsen I think I will try a plated diff as I like the idea of the adjustability. Keep us posted
Panthero Coupé quattro 20vt
Indigo ABY coupé
Imola B6 S4 Avant
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