[gsfent]

My SPEC stage 3 non-SAC clutch kit and single-mass billet aluminum flywheel will be installed tomorrow.

Could anyone tell me the right break-in procedure?

The first 1000 miles, drive gently, let the surfaces get mated to each other. No really hard launches. To me, like bedding in brakes for street driving, just normal driving for a few hundred miles and all good to go.

There have been a lot of recent discussion about giving the clutch time to seat before you try to hammer it, or you will ruin the clutch material for the (much shorter) life of the clutch.
Regards,
Jerry

 

[boostmiser]

Keep us updated on this clutch combo. Performance, durability, rollover noise etc. I'm looking at the Spec stage 1 version due to cost restraints.

 

[marcvip]

SPEC insists having the newly installed clutch driven like a "granny" for at least 500-600 miles...

 

[XrayMD]

While this is for SAC type clutch, break-in should be similar:


Per BMW:

BMW AG - TIS
RA: Breaking in SAC clutch
Issue status (03/2002)

Break in the friction linings of the clutch by applying light to medium loads, in the same way as for brake linings. This preconditioning creates a carbon layer between lining and metal friction surface which in the end generates the necessary coefficient of friction. Breaking in can take the form of either normal driving with many gearshifts or a specific breaking-in program on gentle gradients.

"Normal" driving will not damage the clutch. "Normal" driving conditions involve drive-off speeds of up to approx. 2500 rpm on a medium gradient, e.g. when driving onto a transporter. Normal driving off on a level surface at speeds up to approx. 2000 rpm are likewise sufficient.

Sporting driving maneuvers will destroy a new clutch! These include driving maneuvers at high differential speeds, overlaps or very high drive-off speeds, e.g. when driving onto a transporter.

When a vehicle is moved "normally", an empirically established figure of approx. 800-1000 gearshifts is applicable to an optimally broken-in lining.

Please conduct the following breaking-in program in order to avoid later customer complaints:

* specifically for M5 and Z8 vehicles

Breaking-in program for approx. 30 km on road

Vehicle subject to "moderate" shifting processes

Drive off at max. 2000 rpm; upshift 1->2, 2->3, 3->4; upshift at 3500-4000 rpm, downshift 4->3, 3->2, 2->1, downshift at 2000 rpm

Drive off 3 to 5 times on a gentle gradient up to approx. 12%, drive-off speed max. 2000 rpm


:cheers: