The engine produces torque. The car will accelerate according to Newtons second law ie the accelerating force equals the mass x acceleration plus losses. The clutch therefore always has to transmit the engine torque regardless of gear and mass. In first gear the torque at the wheels is greater due to the low gear, therefore wheelspin is more likely to occur, particularly in a lighter car. The torque at the clutch is the same regardless of what gear the car is in if you boot the throttle, so although the wheels are more likely to spin at low speed, the clutch is just as likely to slip in higher gears, indeed when a clutch plate wears out, the slip is usually first noticed in the higher gears. This is why, I believe weight does not make a difference to the clutch, but will stand corrected. My standard Zetec torque was 135 lb ft at the RR compared to your 232. That is a phenomonal increase and I'm sure the standard clutch does not have that excess torque capacity. At the Autosport show I talked to Helix Clutches, who are based near me. As the Xtreme is a bit of a hashed clutch set up and I've had problems before with release, they offered to measure my existing one if I take it down and match it. They have also given me the torque figures for the upgrades they do. Nigel
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