[Bubbles]

According to Roundel, 335d is only available as an auto because BMW does not have a clutch package capable of handling the 427 lbs of torque (see page 14). With tunes cranking out near 400 lbs of torque, I wonder how the clutch is handling the increase torque. I know there have been discussions with regard to the power handling abilities of the AT and MT, but I wonder if the clutch will suffer premature wear due to the increase in torque (assuming an above average MT driver). Personally, I know of two people who have had their clutch replaced prior to 10k (one with piggy-back and one without). Of course this may be apples to oranges.

[sales@ESSTuning]

Well, the 335 = 550 = E92 M3 tranny/clutch, so I'd think they are pretty robust...

[Full Function]

I think one of the main contributions to premature clutch wear is more abusive driving rather then power. The torque is only applied for a fraction of a second between shifts, so unless you are slipping the clutch all the time, you should not see a huge amount of wear. Unless you are increasing torque significantly (read 50% or more), then the clutch should be able to hold the power or slip slightly during initial engagement, which is what is should do anyway from what I understand. Both the transmissions and the clutch systems in these cars are very durable... from what I've seen anyway.

Jerry

[Park2670]

Same trans in the 6 speed M5/M6 as well. They should be ok handling the torque.

[turbotko]

Unless the power output becomes high enough to make the clutch slip, there will be no excess wear. Mine has never slipped once with V2 at 15 psi and some other supporting mods. So far it's up to the task.

If the clutch does start to slip, no big deal. You just replace it with something stronger.........it's part of the mod game.
I might be a little biased though, my price on a stock clutch kit is $145 and the labor is free