jphughan

Yeah, the mysterious "torque peak limiter" that AP mentioned. From searching around, the most common belief seems to be that that's a "clutch delay valve" that will smooth out clutch engagement if someone dumps their clutch. I don't think that was specifically intended to avoid this scenario, but yes it does suggest that the engineers felt that some extra safety measures needed to be placed around the gearbox as a result of pairing it with the 3.8 -- although considering all of their other models with the most power and enthusiast appeal are now PDK-only, I wonder if they might have done the same on those cars as well. I wonder if the 911R and upcoming GT3 will have such a limiter.

But the counterargument to that position is that GTGears and BGB have both said that they've used these gearboxes successfully under brutal conditions and, in some BGB cases, even with 3.8 motors without seeing issues like this, although those probably used the spline 3rd gear, so maybe the box would have been just fine had it not been for the switch to EBW?

4carl

Does anybody have a picture of a 981 splined 3rd gear? If in fact they used it in the 981 gear boxes. Or is it pure conjecture that they changed the 981 third gear to the EBW design?

okie981

I believe the EB design was confirmed in a failed gearbox torn down, with a photo posted in the other thread on the topic.

jphughan

No pic, but there is this post from GTGears, emphasis mine: