[Jord]

Clutches are killed via torque. The higher the torque rating and from and higher rpm for the clutch to engage flywheel glazes and damages friction plate.

Many new cars including S40 2.0d use dual mass flywheel. 2 part flywheel(dual) first plate has freeplay to intially engage flywheel which then engages 2nd part(when freeplay ends) This is designed for smooth gear change. Again this is killed via torque and high rpm engagement with clutch.

To summarise remapped vehicles, Especially diesel achieve higher Torque ratings aswell as BHP. Traffic light racing will lower your clutch/dual flywheel life drastically where as doing power pulls from 3rd gear doesnt put as much stress on components.

Hopefully that explains.