Test drove C63 today
11-04-2008, 12:41 PM
#12
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It reduces, but does not eliminate, the need
Audi's solution to the problem is EDL. EDL uses open differentials and squeezes the brake on the spinning wheel. For the most part, there's nothing wrong with that. IIRC, the C63 is equipped with a similar brake squeezer instead of an LSD.
When you disable EDL, you'll find that, even with Quattro, Audi's open diffs really don't get the job done except when you're going straight and the pavement is dry.
When you disable EDL, you'll find that, even with Quattro, Audi's open diffs really don't get the job done except when you're going straight and the pavement is dry.
11-04-2008, 12:45 PM
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My car does peg leg burnouts in the wet
Quattro alone is fine at the meager power levels most of their cars produce. At S4 and RS4 power levels, the open diffs don't get the job done. Audi has an electronic bandaid for that. IIRC, the C63 has the same electronic bandaid to cover for the lack of an LSD.
11-04-2008, 12:46 PM
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flywheel?
It's an automatic car, so it has a torque converter... and the C63's is special because after 1st gear it remains locked. Also, I think that the off-throttle engine braking you describe is a tunable parameter of a good rear diff and torque converter... meaning the factory chose to set them that way.
11-04-2008, 01:44 PM
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At the audi drive at NHIS a few months ago
in the autocross part, the new C class did seem to have a plasticy interior, cheap looking. I feel like my 94 c class [w202] was a lot more elegant/classy for its time..
11-04-2008, 03:15 PM
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It's Audi's system for faking an LSD
On the open diffs at the front and rear of the car, when a wheel spins, the computer steps in and applies the brake to the spinning wheel.
Audi calls it "Electronic Differential Lock," but there isn't a single locking differential in the system.
Audi calls it "Electronic Differential Lock," but there isn't a single locking differential in the system.