Quote:
Originally Posted by dpfarr
When do stock clutch slip? Noticed the disclaimer to upgrade clutch on the description.
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The stock Exedy clutch is rated for the stock engine’s torque. I have their Stage 1, which is rated at 166wtq. I am running a Harrop kit and an Ace 150 with E85 at a bar of boost, so the clutch is capable of handling a lot more torque. Similarly, the stock clutch can support more. With that said, most supercharger owners tend to upgrade the clutch over 8 psi. If someone is tracking their car then they would typically upgrade with any forced induction. A turbo tends to add more torque than a supercharger, so anything over 5 psi might require an upgrade.