35is and JB4

[mcbutler]

Precisely, I would be interested to know the torque max limit for the DCT if anyone knows??

[Pbondar]

Precisely, I would be interested to know the torque max limit for the DCT if anyone knows??

Transmission Model Engine/torque Transmittable torque rating
GS7D36SG E90 M3 E92 M3 E93 M3 400 Nm 520 Nm

The 36 stands for 360 ft lb which is the marketing torque limit

Most sources cite 520nm as the limit

Interesting that's the output shaft torque limit at 400nm input shaft

So the box is spec'd for the 35i constant max torque not the 35is boost torque number..

[mcbutler]

Precisely, I would be interested to know the torque max limit for the DCT if anyone knows??

Transmission Model Engine/torque Transmittable torque rating
GS7D36SG E90 M3 E92 M3 E93 M3 400 Nm 520 Nm

The 36 stands for 360 ft lb which is the marketing torque limit

Most sources cite 520nm as the limit

Interesting that's the output shaft torque limit at 400nm input shaft

So the box is spec'd for the 35i constant max torque not the 35is boost torque number..

wow, you really are the ‘font of all Z4 related knowledge’. Very interesting. So, my 35 I running 400lbft is probably going to wear the clutch pack out pretty quick!

[Pbondar]

Precisely, I would be interested to know the torque max limit for the DCT if anyone knows??

Transmission Model Engine/torque Transmittable torque rating
GS7D36SG E90 M3 E92 M3 E93 M3 400 Nm 520 Nm

The 36 stands for 360 ft lb which is the marketing torque limit

Most sources cite 520nm as the limit

Interesting that's the output shaft torque limit at 400nm input shaft

So the box is spec'd for the 35i constant max torque not the 35is boost torque number..

wow, you really are the ‘font of all Z4 related knowledge’. Very interesting. So, my 35 I running 400lbft is probably going to wear the clutch pack out pretty quick!

Its difficult to know..

On the one hand there are many people running boosted cars with these boxes without documented effects..

On the other people sell stronger clutch packs for them..

IMHO, British Leyland excepted (where I witnessed some true muppetry), most German companies would massively underate their products to avoid marginal warranty claims..

The manual box is alleged to be much stronger than the DSG for those going for serious OD on BHP on the 35i

Personally if the car was a keeper, and I pressed the go pedal to the bottom a lot I wouldn't go much more than 600nm max which is just a tad above the celtic type re-maps..

[R.E92]

The DCT holds more torque than the manual transmission. The manual transmission is cheaper to upgrade though.

I've seen a few dyno slips from people holding 554ftlb (750Nm) without any reported slip.

[mcbutler]

I agree with Pbondar a comments BMW under rating the box to reduce warranty claims. Probably also the reason they don’t sell the engine in a 400bhp plus version!