No, but there are all-wheel drive systems that use electronically
controlled clutches instead of differentials, and I'd imagine that these
might not operate in reverse. It could be that the OP doesn't know or
understand the difference.
Exhaust pipes at the back, and the seat with the round hand-rail faces the
(Semi-non-facetious bit: like brakes, clutches only operate in one
rotational and one linear dimension. Direction is irrelevant, just the
outcome. A bit like a politician.. ;o)
Hairy One Kenobi
Disclaimer: the opinions expressed in this opinion do not necessarily
Yes, but that's only *if* the clutch engages. Given that they're
electronically controlled in such systems, the electronics could easily
be programmed not to engage the clutch while in reverse.
What makes it cost more to disable the clutch operation? It's all
software anyway. It probably looks something like this (just a
if (wheelslip > THRESHOLD)
if (speed < CUTOFF)
...uh, or something. If they allowed operation in reverse, they might
very well have to add more code, like this:
if ((wheelslip > THRESHOLD) or (wheelslip < REVERSE_THRESHOLD))
if ((speed < CUTOFF) and (speed > REVERSE_CUTOFF))
That's a little bit more code that someone has to write, someone has to
maintain, someone has to test, one more thing to screw up, etc. Maybe
it's just simpler (and better for the bottom line) to disallow operation
of the clutch pack while in reverse gear.
yes quattro works in reverse , thats why they did not use the titan (vw)
back in the 80s a viscous wouldnt work in reverse
the electronic systems have no probs working in reverse and my a4 a6 and a8
/v8 all work 4wd in reverse
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.