I don't know that the difference in gearing would have that much of an affect. The front and rear differential RS6 gearing is 3.197Originally Posted by DHall1
The base ZF tranny gearing is:
1st: 3.571
2nd: 2.200
3rd: 1.505
4th: 1.000
5th: 0.804
Final gearing then is:
1st: 11.412
2nd: 7.033
3rd: 4.811
4th: 3.197
5th: 2.570
The S6 has final differential gearing of 4.111. “IF” the parts could be swapped, I might in fact give it a go. That would give a staggering 1st gear of 14.680 – albeit at the cost of your 5th gear top-out.
So, to my point, the new ZF 8spd transmissions have an additional 3 gears which assist in getting you a steeper 1st gear (launch) and 8th gear for some long legs. The new RS7 as a reference has a base first gear ratio of 4.71 and a differential gearing of 3.08. That’s a final gearing of 1st: 14.507 which is just a tad smaller than the above.
Entirely about gearing as you can see. Yes, with only 5 gears, you compromise upper for lower. I don’t tend to drive 280+ all that often, so I wouldn’t mind having more fun with gearing that helps acceleration even more. I think I need to research the swapping of the front diff a bit more now....To my benefit, I have both a C5 RS6 and S6 tip sitting in my garage collecting dust. Time to disassemble the diffs and check things out with micrometers.
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