Has anyone seen this post on Brickyard?

[lhd]

http://www.brick-yard.co.uk/forum/audi- ... 71714.html" onclick="window.open(this.href);return false;

Was wondering if it could be done using a quattro box for a syncro?
Probably not but you never know.
Rob.

[syncropaddy]

Anything can be done but at what point do you stop ...... The front shafts are very low down on a Passat 4motion so if you flip the box they become very high up. Then you have CV angle issues. I wonder if you can flip the diff around?

[lloydy]

Wouldn't a AWD porche 911 box be better due to rear engine config? Would lose diff locks though...

[syncropaddy]

Wouldn't a AWD porche 911 box be better due to rear engine config? Would lose diff locks though...

Yes they would be better but I think you might have 'electronic' locks of some sort. Unless you have a 959 in the garage

[..lee..]

plus you`d need to find a g gear.

porsche 6 speed with lower cwp 1g and 5 speed.

or auto conversion may not need g gear then.

[silverbullet]

The Porsche G56 (i think it's called) is the one that some of the tuners go for and there is a Carrera 4 variant that MG is using in his Bluestar AWD project.
The thing about the Audi boxes is that the diff housing is offset for load of technical reasons, so there's no room to fit a flipped/reversed cwp set (unlike a Subaru trans which will just squeeze in with a bit of Dremel work) Otherwise you would see examples of quattro-equipped "syncro" buses all over the place. It's a pity 'cos the early manual Allroads came with a low-range option
The only really viable alternative is the awd version of the Ren.... UN-1 known as the UN-7 as these were designed with a Spiroid diff, which allows them do be used in front or rear-engine applications.
That's why the kit car boys love 'em and they are reasonably durable, Lotus used them for a long while in the Esprits etc. But...it's a big old lump with a nice gearshift and requires surgery to the rear cross-member to get it all into a T3, as Tim has shown.
There's no reason why difflocks couldn't be made to fit one of these, but the work involved...
As for running a transaxle upside down, don't get me started. It's just wrong and make more problems than it solves.
IMHO

[..lee..]

subaru also did the low range option in the legasy early on. that box would be ideal if you could flip the diff. mike`s looked in to it and recons it cant be done.

sure i read somewhere about the subaru torque split being rwd biased in the road cars so in the vans it would end up being fwd biased. dont know if this could be rectified. dccd system can supply 50:50 split. dont know much about the other 4wd options non porsche.

lee.

[silverbullet]

Unfortunately the spool gear for the low-range in the Legacy is on the input shaft (not at the output like the Allroad) and opposite the crownwheel. Try to flip the diff and it fouls by a significant amount. It also puts a limit on the input torque as the reduction gear multiplies this up through all ratios.

Checking from my early Legacy manual, the n/a 1.8 and 2.0 Legacy had a greater ratio drop than the 2.2, to stop it overloading the transmission. Something like 1:1.6 for the little ones vs 1:1.2 for the 2.2 and Turbos didn't have a low-range option.

Torque bias is 50:50 with the VC centre diff. Much later ones may be different.