I have a question about the 997 C4's all wheel drive system. Is it the same as the old 996 or did Porsche change it on the 997??

Any word on this would be greatly appreciated.

MHC4

 

It is the same system as on the latest revision of the 996 but with the new 997 suspension is pretty much "transparent".

 

Thanks for that. At least now I know.

Someone told me that the 997TT all wheel drive will be revamped. Is this true??

 

The four-wheel drive of the new 911 Carrera 4/S models employs the tried
and tested viscous multiple-disk clutch which is familiar from the predecessor
models (type 996).

Torque support
Similarly to the familiar four-wheel-drive vehicles,
the new 911 Carrera 4/S models are also fitted with a torque support
connected to the front-axle final drive.
This support transmits the forces pertaining to the torque output from the
front-axle final drive and stays them via a bearing on the body.
Its design has been largely adopted from the predecessor four-wheel-drive models.

The shaping of the cylindrical center part is new. On the predecessor models
(type 996), this consisted of a closed tubular profile. The disadvantage of this
design is that the transmission noise generated in the front-axle final drive by
the gearwheels is emitted via the wall of the tubular profile.
The tubular profile forms a resonant body with a large acoustic emission surface.
The new torque support consists of a composite open, rigid support system.
This is not only more stable – and thus less susceptible to the transmission noise –
but also offers smaller acoustic emission surfaces.
This results in a marked improvement in acoustic properties.