I am looking for center and rear differential updates for the Audi quattro system in my 2001 A4.
I race the car in SCCA rallycross competition and having just a torsen center differential is a disadvantage in low grip ice/snow events. Typically the car swaps from severe understeer to severe oversteer and back and forth with the torsen just spinning one end like crazy.
I noticed in 2010 there were some updates to the center differential
A new " With the new "Crown Gear" center differential, up to 70% of the torque can be applied to the front wheels while up to 85% can be applied to the rear wheels if necessary. The net result of this advance in quattro is the ability of the vehicle electronics to fully manage the vehicle dynamics in all traction situations, whether in cornering, acceleration or braking or in any combination of these."
I have run with locked differentials in the coupe quattro's and the understeer was pretty bad. Rather than go to a locking differential I was thinking this might be an option.
Does anyone have any details if this swap is possible? Does the new center diff require a controller? like a haldex unit?
Would this diff, or complete trans fit in a B5 A4? would the ratio's match my existing rear end- or could I swap the whole driver train in? I haven't really kept up to speed on the new audi's so I am not sure what is compatible anymore.
As far as the rear diff - I have machined a "phantom grip" diff insert with die springs to add 400 lbs preload to the spider gears, but it's far from a real lsd. are there any affordable options out there? OEM swaps?
PS - my co driver and I kick the crap out of the subaru's in awd modified class !!!!