Spec Stage 4 Clutch Kit Non-SAC SB534-2 – BMW 135i / 335i (N54)

OVERVIEW

The SPEC Stage 4 clutch kit is a solid-hub version of the Stage 3. The hub is solid 8-rivet and the assembly is heat treated for strength and durability. It is available in 3, 4 or 6 puck configuration — the 3 puck is the lightest option, the 6 puck gives the smoothest engagement and the 4 puck is a compromise between the two. It is street drivable in 6 puck form but not street friendly, because of the rigid hub. SPEC recommends it for drag racing, road racing, pulling, rally and drift.

This is the non-SAC version, built to run on a single mass flywheel. It is not compatible with the OEM dual mass flywheel. SPEC notes that a single mass flywheel is generally only needed on cars making in excess of 500 WHP / 500 lb-ft.

SPECS

• Stage 4 single disc clutch kit
• Torque capacity: 580 ft-lbs
• Friction material: carbon-graphite, puck disc — available in 3, 4 or 6 puck configuration
• Hub: solid 8-rivet, heat treated (rigid — not street friendly)
• Pressure plate: SPEC high-clamp
• Flywheel requirement: single mass flywheel required — not compatible with the OEM dual mass flywheel
• Built to order — ships in 1–2 weeks on average

PARTS INCLUDED

• Pressure plate
• Clutch disc
• Pilot bearing
• Release (throwout) bearing
• Alignment tool
• SPEC clutch kits supplied for use with a SPEC flywheel include pressure plate, disc, pilot bearing, release bearing and alignment tool.
• When a SPEC flywheel is ordered it ships with pressure-plate-to-flywheel bolts.

TECH RESOURCES

Additional Parts Required

• SPEC single mass flywheel — REQUIRED. Choose by production date: SPEC 8-bolt steel SMFW SB53S-2 (2007 – 1/2009), SPEC 8-bolt aluminum SMFW SB53A-2 (2007 – 1/2009), SPEC 6-bolt steel SMFW SB53S-3 (2/2009 on) or SPEC 6-bolt aluminum SMFW SB53A-3 (2/2009 on).
• Pilot bearing, release bearing and alignment tool are included in the kit.
• Installer-supplied: transmission jack, new flywheel-to-crank bolts and BMW-specification transmission oil if the transmission is drained.
• When switching to a single mass flywheel some flywheel chatter or rattle is to be expected.

Installation

• SPEC does not publish a downloadable installation PDF for this application — follow the printed installation and break-in instructions supplied with the kit.
• Installation requires removal of the transmission and should be carried out by a qualified technician. Inspect the pilot bearing bore, clutch fork, release-bearing guide sleeve and slave cylinder while the transmission is out.
• Bed the clutch in with light, gradual engagements before applying full load.

Notes

• Flywheel bolt pattern changes with production date — 8-bolt through 1/2009 and 6-bolt from 2/2009. Confirm your production date with Speed Logic before ordering.
• SPEC does not list the 1M Coupe for this part. The 1M takes the SB554-2 kit with an SB55S-2 or SB55A-2 flywheel — contact Speed Logic.
• SPEC also lists this kit for the 535i (E60), Z4 35i (N54) and X3 (F25). Contact Speed Logic if you need one of those applications.

PART NUMBER

• Clutch kit: SB534-2
• SPEC flywheel, 8-bolt (2007 – 1/2009 production): SB53S-2 steel or SB53A-2 aluminum
• SPEC flywheel, 6-bolt (2/2009 production on): SB53S-3 steel or SB53A-3 aluminum

VEHICLE APPLICATIONS