What is the primary benefit of a Stage 3+ clutch kit over a stock clutch?

A Stage 3+ clutch kit, like this SPEC SB153F, is designed to handle significantly more horsepower and torque than a factory clutch. It uses a heavy-duty pressure plate for higher clamping force and a performance disc, making it suitable for modified engines or aggressive driving.

Does this clutch kit come with everything needed for installation?

This kit includes the performance clutch disc and heavy-duty pressure plate. It is recommended to also inspect and potentially resurface or replace the flywheel, and you will need a pilot bearing and alignment tool, which are typically sold separately.

How does the sprung hub on the clutch disc affect driving?

The sprung hub on the clutch disc helps to dampen vibrations and shock loads from the engine and drivetrain. This can lead to a slightly smoother engagement and a more comfortable driving experience compared to a solid-hub clutch disc, especially in daily driving situations.

Specifications

Brand: SPEC
Part #: SB153F

Spec 85-88 BMW 535 3.5L Stage 3+ Clutch Kit

Name: Spec 85-88 BMW 535 3.5L Stage 3+ Clutch Kit
Brand: SPEC
SKU: spec-spec-85-88-bmw-535-3-5l-stage-3-clutch-kit-t14-7830
Price: 757.79 USD
Availability: BackOrder

$757.79

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Key Features

Fits 1978-1984 BMW 733i, 1985-1988 BMW 535i, and 1988 BMW 535is.
Stage 3+ performance clutch kit designed for high horsepower and torque applications.
Includes a sprung hub clutch disc to help absorb driveline shock.
Features a heavy-duty pressure plate with increased clamping force for positive engagement.
Well-built components to handle demanding driving conditions and modified engines.

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About this part

Product Details

This is the SPEC Stage 3+ Clutch Kit, designed specifically for your 1978-1984 BMW 733i, as well as the 1985-1988 BMW 535i and 535is models with the 3.5L engine. If you're looking to handle significantly more power than stock, whether from engine modifications or just want a more robust setup for spirited driving, this clutch kit is built for the task. It's a well-built assembly that replaces your original clutch components to manage increased torque and horsepower.

The Stage 3+ designation means this kit includes a performance-oriented clutch disc and a heavy-duty pressure plate. The disc itself features a sprung hub, which helps absorb some of the shock and vibration that can come with a higher-engagement clutch, making it a bit more streetable than a solid hub design. This is important because while it's built for performance, you still want a reasonable driving experience. The pressure plate offers a much higher clamping force than the factory unit, ensuring that the clutch disc stays firmly engaged even under demanding conditions. This kit is a popular choice for those who have upgraded their engine's output and need a clutch that won't slip.

When installing this kit, remember that it's a significant upgrade over the stock clutch. You'll want to ensure your flywheel is in good condition, and it's often recommended to have it resurfaced or replaced at the same time. This clutch kit is designed to fit right into the factory transmission bellhousing, but due to the increased clamping force and engagement characteristics, it's a job best suited for someone with experience or a professional mechanic. It's a solid option for anyone pushing their BMW's powertrain beyond its original limits.