Performance Clutch & Flywheel Specialists

Frequently Asked Questions

Types of Kits Available: In which applications should 1A/ 1B/ 1C kits be used?

-1A (Sprung Organic) clutch kits should be used for street performance driving. Normally applications that have had minor performance upgrades like an exhaust, intake and tune.  Most kits are a 15-20% upgrade in torque.

-1B (Sprung Ceramic) clutch kits are used for high performance street and track driving where the horsepower has been increased even further. Normally a turbo or boost upgrade along with supporting modifications.

-1C (Cushioned Ceramic) clutch kits are used for extremely high performance street and track driving where the horsepower has been increased even further and the driver still values good driveability. Normally a turbo or boost upgrade along with supporting modifications.

-1R (Ceramic Race Single) clutch is for motorsport use only. This is an extremely high clamping force clutch for track use or extremely high horsepower vehicles that need to retain a single plate clutch.

Types of Kits Available: What is the difference between a sprung and rigid disc?

A sprung disc incorporates springs around the hub which allows movement of the hub independently of the friction material. This allows the power to be gradually transferred to the gearbox, making the entire process smoother and quieter.

Rigid discs do not have this dampening effect and are simply a solid disc riveted to an input shaft hub. These discs are stronger and generally used in racing applications for reduced mass on the input shaft.

Types of Kits Available: Why don’t all twin plate clutches have sprung hubs?

This is dependent on the application and type of vehicle the clutch is designed for. Vehicles will respond differently to rigid and sprung discs and therefore, each clutch is designed and built to suit a specific application.

Types of Kits Available: What materials are Xtreme Flywheels made from?

This is application specific, but in most cases, the flywheel will be produced from 4140 Chromoly. This material offers exceptional weight savings and strength. Xtreme Clutch also use very high quality QT450-10 Ductile Iron to produce flywheels. This material is high strength and provides a great surface area for mating with organic friction material.

Types of Kits Available: I’m doing an engine conversion, do you make clutch kits to suit?

Absolutely, we specialise in engine and gearbox conversion clutch kits. For some popular conversions, we may even have the kit in stock or already designed. For others, we may need some dimensions from you, allowing us to produce a clutch kit to suit almost any application.

Types of Kits Available: Why do some clutches convert pull type to push type?

Occasionally a vehicle is converted to have push type actuation to increase the range of clutch kit options for that vehicle. Converting the vehicle to push type allows kit options such as 184mm, 200mm, and 230mm racing clutches to be installed.

Driveability & Benefits: What are the advantages of a performance clutch?

A performance clutch is designed to provide improved clamping force and/or an alternative friction material to increase the torque capacity of the clutch. This allows the clutch to handle increased engine performance without slipping or failing.

Driveability & Benefits: What are the side effects of a performance clutch?

Like with most performance modifications, performance clutch kits come with a compromise. Each clutch is different depending on the level of performance. Some can have slightly increased operating effort and levels of shudder depending on the diaphragm and friction material. 

A performance clutch can also cause increased noise in the driveline and twin plate kits can “rattle” when the clutch pedal is depressed due to the floating intermediate plate.

These side effects are generally very minor and are often overlooked due to the benefits of a performance clutch upgrade.

Driveability & Benefits: Will I get more mileage from a performance clutch?

In most instances a performance clutch is designed to handle increased performance rather than resist wear. However, in cases where a standard clutch is slipping due to the vehicle having more power or torque than the capacity of the clutch, then it is likely to wear out much quicker, meaning a clutch designed for performance applications will last longer in this case.

Driveability & Benefits: Will a twin plate clutch make noise?

Depending on the style of twin plate, it is likely that the clutch will omit a “rattling” noise when the clutch pedal is depressed. This is due to the intermediate plate floating. Xtreme Clutch has developed a range of 10.5” (263mm) twin plate kits for some applications where the intermediate plate is strap driven, stopping the intermediate from rattling when the clutch pedal is depressed. There can still be increased driveline noise when changing to most style of twin plates.

Driveability & Benefits: What are the side effects of converting to a SMF from DMF?

A single mass flywheel loses the dampening effect of a dual mass flywheel and as a result, a single mass flywheel can cause more noise and vibration. These factors are not damaging to the vehicle’s components when combined with the correct friction disc with wide angle dampening.

Driveability & Benefits: Will my pedal effort change with a performance clutch?

This is dependent on the type of clutch and vehicle. A performance clutch can increase or even decrease pedal effort. It is also likely to alter the engagement point and the way it engages. At Xtreme Clutch, we conduct extensive testing and development to improve the driveability and pedal effort of our clutch kits

Driveability & Benefits: Will a performance clutch effect the longevity of the gearbox?

All Xtreme clutches are designed to be specific to the application. It is not likely that the clutch will cause more wear and tear on the gearbox but the type of driving that is done with the clutch can cause damage. Being overly aggressive with a stronger clutch could cause damage.

Driveability & Benefits: I use my car for towing, will a performance clutch help?

If your vehicle is used regularly to the limit of its peak torque and the factory clutches are not lasting then it can be very beneficial to use a heavy duty clutch for towing.

Driveability & Benefits: How will a lightweight flywheel effect engine response?

A lightweight flywheel will improve the engine response of a vehicle as the engine does not need to work against so much rotating mass. It can reduce drivability in street vehicles and make it easier to stall.

Installation: Can I use an Xtreme clutch with a flywheel from a different manufacturer?

Depending on the clutch kit and flywheel application, you may be able to use an Xtreme Clutch assembly with a different flywheel, however as some manufacturers use different designs for their pressure plate, it is vital to check this with Xtreme Clutch first before ordering.

Installation: Do I need to replace hydraulic components when upgrading my clutch?

Not necessarily. We always recommend inspecting (or upgrading when necessary) any components that may wear such as concentric slave cylinders when replacing a clutch kit. Due to the labour involved with removing the gearbox, it can be good insurance to do these at the same time. Xtreme Clutch commonly provide these components with their kits. In some cases, it is important to update the hydraulics when upgrading your clutch kit in order to make the clutch operate correctly.

Installation: What is the best process to break in friction material on a new clutch?

It is vital to correctly bed a new clutch kit in to ensure the best durability, performance and feel. To bed a clutch kit in, drive the vehicle gently for the first 1,000 km and avoid launching the vehicle aggressively. Low RPM engagements are best for bedding in the friction material with the flywheel surface.

Installation: What clutch fluid do you recommend for use with an Xtreme Clutch?

It is best to check with the vehicle manufacturer what the recommended grade of fluid is for the hydraulic system. Some clutch systems share common brake and clutch reservoirs. In most cases, for street use, anything above Dot 3 is fine. In performance applications or where a common brake and clutch reservoir is used, a minimum of a Dot 4 or 5.1 should be considered.  It is important that these are never mixed with any systems designed to utilise Dot 5 fluid and these fluids should never be mixed with Dot 5 fluid. It is also important to check the compatibility of these fluids with Xtreme Clutch for your specific kit before using in the vehicle.

Installation: Are spare parts available for Xtreme Clutch products?

In most cases it is possible to purchase individual components from Xtreme Clutch. In multi plate applications, Xtreme Clutch offer a range of discs and intermediate plates as individual components and it is also possible in some applications to upgrade your clutch to a higher specification.

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