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will automatically adjust depending on clutch chosen
Replacement clutch kits for '91-'93
M5
Also for use with UUC Stage2 M5 clutch conversion flywheel for '92-'05
3-series*, '94-'99 M3, all 6-cylinder '97-'04 5-series, all Z3
* not for 330i 6-speed or late E46 325i.
All UUC clutch
kits offered include: pressure plate, clutch disk, release bearing,
alignment tool
How to choose a clutch
The selection of the correct clutch for the intended application
is critical to good operation, including the characteristics of (but
not limited to):
- clutch feel
- operating temperature range
- wear characteristics / durability
- clamping force
- break-in period
Quite often, the first impulse is to get "too much" clutch. This
is often a very big mistake, as there will be compromises in some or
all of the operational features listed above.
The first step in identifying what clutch to get is dependent on
the characteristics of the car. Ask these questions:
- How much power does the car make?
- How is it used? Street driving or track use? If for racing,
what kind of racing?
As we are dealing with BMW applications here, let's use an
widely-understood example - the 1992-2004 6-cylinder 3-series. Over
this 12 year period comprising two different chassis, we are still
dealing with virtually the same fundamental engine and transmission
designs. Power ranges from around 190hp to 333hp. Typical bolt-on
modifications bring many of the early models up to the 215hp-260hp
range and later models around 350hp. Extensive modifications including
supercharging or turbocharging bring power to the 350hp-450hp range,
with some examples in the 500hp-600hp range. The typical BMW enthusiast
uses the car primarily for sporty street driving, and the occasional
auto-x or track day. The 3-series is also popular as a heavily-tracked
car and dedicated race car. Some see time spent drag racing, whether
occasionally or as dedicated drag racers.
So it is apparent that we have a broad range of power and use to
contend with.
Presented in increasing "aggressiveness", here is a brief overview of
clutch compounds, their power handling, and other characteristics:
(note that hp figures are generalized, pressure plate clamping force
and torque curves are additional factors)
organic |
CHARACTERISTICS:
Metal-fiber woven into
"organic"
(actually CF aramid with other materials), original-equipment style.
Known for smooth engagement, long life, broad operating temperature,
minimal-to-no break in period. Will take hard use, somewhat intolerant
of repeated abuse (will overheat). Will return to almost full
operational condition if overheated. Material is dark brown or black
with visible metal fibers. |
USE:
Street-driven cars up to 350hp,
auto-x and track use. |
|
performance organic |
CHARACTERISTICS:
Same
as organic above with higher torque capacity disk and higher clamp-load
pressure plate. |
USE:
Street-driven
track cars up to 500hp, auto-x and track use.
|
|
segmented kevlar |
CHARACTERISTICS:
A
high-durability material more resistant to hard use. Engagement
is similar to organic, but may glaze slightly in stop-and-go traffic,
resulting in slippage until worn clean when used hard again. Has
a break-in period of 500-1000 miles during which slippage may
occur. Care must be taken during this period not to overheat from
excessive slipping. Material is uniform yellow/green and may look
slightly fuzzy when new. Segmented
(blocks or sections missing) for better heat dissipation. New
generation of kevlar offered by UUC is resistant to glazing and is
an excellent choice for smooth operation in high-powered cars or those
equipped with SMG transmissions. |
USE:
Street-driven
track cars up to 650hp, auto-x, and heavy track use. |
|
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2003-2012 UUC Motorwerks