Big news for owners of E46
3-series/M3, E39 5-series/M5, and Z8!
Many owners of these
cars have experienced mushy clutch feel, inconsistent engagement,
and premature wear of the clutch in their manual-transmission cars.
The reason is quite simple - the original BMW (LUK-manufactured)
clutch has a new "SAC" (Self Adjusting Clutch) design. This new
mechanism built into the pressure plate is supposed to keep the
clutch pedal engagement point the same as the clutch wears... but
in all reality, it's a case of "an answer to a question that nobody
was asking." They have added a layer of complexity and feedback
isolation, filling a need that didn't need filling - it is not too
often that anybody notices that their clutch engagement point as
moved 1/2" over 50K miles.
The SAC mechanism itself causes
problems; it over- or under-adjusts the pressure plate and
therefore causes the clutch to slip or burn out prematurely. They
are also known to shift, causing the pressure plate release fingers
to slip off the plate, keeping 1/3 of the pressure plate engaged at
all times. Bottom line is that the only fix is a complete clutch
job, and your dealer is likely to claim "driver abuse". We have
seen it happen too many times.
The SAC mechanism may not give a
clean release like a standard clutch. Instead of just two sets of
springs, there is an adjuster mechanism that makes engagement feel
mushy or slow.
All UUC Performance Clutches for
these models use an all-new design pressure plate that does not
have the SAC mechanism. The resulting improvement in feel is
immediate - the clutch is easy to modulate and is consistent,
regardless of temperature. Additionally, the reliability and
lifespan of the clutch are enhanced. The UUC clutch eliminates the
SAC mechanism and restores traditional clutch feel with predictable
and crisp engagement.
All clutches are "direct fit" and require no modifications. Normal
installation procedures apply.