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BMW Drivetrain Parts for BMW E30 M3 S14 2.3L

Building your perfect BMW is more than just adding horsepower and stiff suspension. Your drivetrain needs attention in order to deliver power effectively. Most BMWs feature comfortable clutch discs, heavy flywheels, long shifter throws, and open differentials. The drivetrain transmits power to the wheels, but can also be a source of power loss when it is designed for comfort rather than performance. Everything on this page will help you improve your power delivery and driving experience by providing custom Limited Slip Differentials, Short Shift Conversions, Performance Clutch Discs, Lightweight Flywheels, and anything else your BMW needs to be the perfect driving experience.

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E30 M3 JB Racing Lightweight Aluminum Flywheel

T#:3768

Part#: 520-050-228

Ships in 3 Business Days

$ 630.00 USD

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Aluminum flywheels are much lighter than the stock steel flywheel and that produces better throttle response and more available horsepower to the wheels for faster acceleration. The JB Racing aluminum flywheels are a direct replacement for the stock flywheel and work with stock clutch components for an easy upgrade with very little downside.

Modern flywheels are built with additional components and features that are designed to dampen and minimize vibrations from the engine and transmission. As a result they have become bloated in weight and that means more energy is used up just making the flywheel spin. The weight difference between an aluminum and steel flywheel is huge - sometimes more than 50% less. Without the additional mass, more energy can be diverted to where it counts most - moving the car. The flywheel and clutch is one of the first areas that engine builders address when making the rotating assembly lighter for race engines. The dampening effect is just not needed on cars that are focused on performance.

In addition to releasing more power to the wheels, the lighter flywheel allows the engine to spin more freely, which improves throttle response. Again, the difference is huge as you watch the revs build faster than before. With the engine spinning easier the power band comes up much sooner. The stock steel flywheel feels lazy in comparison. There is a driving adjustment required to get used to how much faster the engine revs but that's not really a downside.

The JB lightweight flywheel is designed to be used with a factory organic clutch - the same clutch kit that you would get from any BMW dealer. This makes replacement clutch components easy to source and inexpensive when compared to specialized racing clutches. By using the factory BMW clutch, JB has also made the whole assembly easy to live with when used on the street. The clutch behaves the same as it originally did - just with better throttle response and more power! The JB flywheel can also be rebuilt with a new clutch contact surface - you don't have to buy a new flywheel.

Aluminum flywheels are considered 'single-mass' flywheels because they do not have the same dampening designs as an original 'dual-mass' flywheel. With a single-mass design more noise and vibration may be noticeable. There are steps you can take to minimize the noise - heavier weight transmission oil and clutch discs with anti-rattle springs (sprung-hub clutch).

The JB flywheel includes ignition trigger wheel.

Stock Flywheel Weight = 19.5lbs
JB Flywheel Weight = 8.0lbs

This item fits the following BMWs:
1987-1991 E30 BMW M3

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Direct bolt-in axle (Priced Each) - E30 M3

T#:402380

Part#: RA2401L5

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$ 1,678.99 USD

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$ 1,678.99 USD

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E30 Direct Bolt-In Rear Axle. The Level 5 Direct Bolt-In Axle for the E30 feature a direct fit outer CV with ABS ring, heavy duty torsional axle bars made from high-grade aircraft quality material, and a larger than factory 6-bolt Porsche style 108mm Inner CV with a bolt-on flange and stub into the differential. These axles are complete and ready to install with no modifications necessary.
The Driveshaft Shop has been manufacturing heavy duty replacement driveshafts for street and track vehicles around the world for the last thirty years. Every single shaft is dynamically balanced at over 9000 RPMs to ensure unbeatable reliability. With materials such as Carbon Fiber, Aluminum, and Chromoly The Driveshaft Shop has a solution for you no matter what the application.

*Priced Per axle

This part fits the following BMWs:
1985 - 1991 E30 M3

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Transmission Mounts E30 M3 BMW Motorsport Group N (Pair)

T#:350970

Part#: 23711417246KT

Ships Jul 30, 2025

$ 289.99 USD

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$ 289.99 USD

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A factory BMW Motorsport part. Made much firmer than factory mounts. These GP N transmission mounts will eliminate transmission movement under hard acceleration/cornering/braking to ensure precise shifting. PRICED PER PAIR

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BMW Drivetrain Parts for BMW E30 M3 S14 2.3L

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E30 M3 JB Racing Lightweight Aluminum Flywheel

Direct bolt-in axle (Priced Each) - E30 M3

Transmission Mounts E30 M3 BMW Motorsport Group N (Pair)

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