Clutch slipping (only first 40 miles and only at max torque)

[DJT88]

Since the fall of last year I’ve been having some intermittent problems with the clutch on my Supra(only owned it since august).

While driving on the highway I notice the clutch slips when I’m really putting my foot down. The slipping starts about when the second turbo starts helping the first , and only noticeable at 5th and 6th gear. So it’s unable to hold its grip at max torque.

The weird thing is when I drive the car for a longer journey, at some point the problem goes away. After around 40 miles I can totally gun it and it will hold the power beautifully.

The thing is I’ve already had the clutch plate and pressure plate (or whatever it’s called in English) replaced with new ones. It’s a stage 1 clutch which should hold even more torque than the OEM right?

But the issue still exists with this new plate (even that it goes away during a longer journey) so I need some advice on what to try next.

 

Hope someone recognizes this and knows what’s wrong.

[Tricky-Ricky]

Have you made sure the clutch pedal/master cylinder rod was adjusted when the clutch was changed? otherwise it could be that causing slipping until the plate and fluid heat up enough to change adjustment, the other option could be a slightly weeping rear oil seal causing the problem.

Edited March 12, 2012 by Tricky-Ricky (see edit history)

[DJT88]

Have you made sure the clutch pedal/master cylinder rad was adjusted when the clutch was changed? otherwise it could be that causing slipping until the plate and fluid heat up enough to change adjustment, the other option could be a slightly weeping rear oil seal causing the problem.

 

I'll check the adjustment, but it's still strange its doing the same thing with the new parts.

About the oil seal. If that's the cause then wouldn't it be more of a juttering slip?