Materials

Clutch Disc Materials

1. Organic Material Discs:

Metal-fiber woven into "organic", original-equipment style.  Known for smooth engagement, long life, broad operating temperature, minimal-to-no break in period.  Will take hard use,  will return to almost full operational condition if overheated.  Material is dark brown or black with visible metal fibers. Street-driven cars up to 400hp, auto-x and track use. Used in OEM and R1 clutches

2. Carbon Kevlar Discs: 

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.  Higher temp range in general, but can be ruined from overheating - will not return to original characteristics if "cooked".  Has a break-in period of 500 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. Will take hard use, intolerant of abuse (will overheat and not recover completely). Used on Stage 1 and Stage 2 clutches. Due to the unforgiving nature of Kevlar, it is not recommended for street cars, especially those that see frequent stop-and-go traffic which will cause surface glazing of the clutch.

3. Ceramic Discs:

Very high temperature materials, usually only found on Stage 3 and Stage 4 multi-puck Discs. Will accommodate high HP  Engagement is more abrupt.  Will wear flywheel surface faster, especially in traffic situations.  Carbon is slightly more durable and flywheel-friendly, ceramic 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.  Street/strip applications for drag-racing  and heavy track use cars up to 500hp.  Will take very hard use, suitable for extreme-clamping applications.

4. Kevlar (i.e. Segmented Kevlar) Discs:

Same material and characteristics as solid kevlar, but segmented (blocks or sections missing) for better heat dissipation.  New generation of kevlaris resistant to glazing and is an excellent choice for smooth operation in high-powered cars or those equipped with SMG transmissions. Ideal for street-driven track cars up to 650hp, auto-x, and heavy track use.

Flywheel Materials

1. Steel/Iron Flywheels:

Steel flywheels are heavier which makes them able to store more energy. Hence, they are faster at launch. They also have a reputation as being more durable and better balanced. Best for drag race type of situations and everyday driving

2. Aluminum Flywheels:

Aluminum flywheels are lighter to make shift changes faster and gain quicker reving . Many Aluminum flywheels also feature additional holes in the metal to make them lighter Their fabrication is also quite different. The outer sides are steel to prevent wear and tear from friction

3. Chromololy Flywheels:

Chromoly is a high carbon steel. Very tough and lightweight, much more so than aluminum. It's also more expensive. It has very desirable properties for a flywheel.