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will automatically adjust depending on clutch chosen
Replacement clutch kits for '84-'91
E30 3-series
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)
| performance
organic |
| CHARACTERISTICS |
Same as organic above |
| USE |
Street-driven track cars up to
500hp, auto-x and track use. |
|
| cerametallic |
| CHARACTERISTICS |
Very high temperature materials,
usually only found on multi-puck disks. Will accommodate 500hp+.
Engagement is more abrupt. Will wear flywheel surface faster,
especially in traffic situations. Has a higher temp range. Multi-puck
design may result in slight shuddering or "stepped" engagement when
used in traffic situations, although many users report completely
acceptable operation. Material is a light tan coolor. |
| USE |
Street/strip
applications for drag-racing, heavy track use, and TCD turbo
applications. Will take very hard use, suitable for extreme-clamping
applications. |
|
