In another thread I made I explained the different types of sachs clutches. In the dmf version you can get clutches for luk and sachs flywheels because gtis use a luk flywheel and tdi's use sachs flywheels so they make a clutch for both sorts. .. Then they make them to fit smf's as well
Why do people say helix clutches are better anyway?
Yes and no. Lets start from the beginning...
The very first 2004 MK5 dervs came with an LUK flywheel, but the flywheel is a slightly different depth on the friction face to the LUK flywheel that the TFSi uses. This is a pita for knowing what kit to go for. Most of the BKD engines used LUK flywheels, even though ETKA states they are SACHS that are fitted. SACHS flywheels seem to have been used from around 2007 onwards on the PD140, but all the PD170's had LUK.
The reason that SACHS list versions for both types of flywheel is because in Europe (not UK) and America, the MK5 GTi came as a TFSi and a TSi. All the TFSi cars used LUK, all the TSi cars used SACHS (on an 8 bolt fly). The MK6 GTi uses SACHS, ED35 and R uses LUK.
LUK flywheels that are fitted to the AXX/BWA/BWJ/BYD/CDL all seem to be the same strength, its just the free play that is different.
06F 105 266 AD (now AG) - 18 deg free play max
06F 105 266 AC - 15 deg free play max
06F 105 266 K - 17 deg free play max
They all have the same max rock.
Helix kits firstly are slightly better priced than the Sachs. Clamping pressure also seems to be greater allowing them to handle more power and the pedal feel is nicer.