Spec Stage 3+ Clutch Kit (SMFW) – BMW 135i / 335i

OVERVIEW

The SPEC Stage 3 PLUS is the flagship stage for a high-powered street or race car that still needs a manageable, friendly engagement. It uses a carbon semi-metallic full-faced material that SPEC rates for unparalleled life, friction co-efficient and drivability in one package. SPEC recommends it for street, drag, drift, autocross, road racing, pulling and rally use.

This is the non-SAC version, built to run on a single mass flywheel. It is not compatible with the OEM dual mass flywheel and it is not compatible with MFactory flywheels. SPEC notes a single mass flywheel is required on cars making in excess of 500 WHP / 500 lb-ft.

SPECS

• Stage 3+ single disc clutch kit
• Torque capacity: 671 ft-lbs
• Friction material: carbon semi-metallic, full-faced
• Hub: high-torque unsprung hub and disc assembly
• Pressure plate: SPEC high-clamp
• Character: manageable, friendly engagement for a high-powered street or race car; SPEC lists street, drag, drift, autocross, road racing, pulling and rally
• Flywheel requirement: single mass flywheel required — not compatible with the OEM dual mass flywheel and not compatible with MFactory flywheels

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), SPEC 6-bolt aluminum SMFW SB53A-3 (2/2009 on) or, for the 2011–2012 N55 6-bolt, SPEC steel SMFW SB55S-2.
• 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.
• The 2011–2012 N55 option on this listing pairs the SB55S-2 flywheel with this kit. SPEC publishes SB55S-2 against its N55 clutch line and pairs it with the SB553F-2 kit rather than with SB533F-2 — contact Speed Logic to confirm the right combination for an N55 car before ordering.

PART NUMBER

• Clutch kit: SB533F-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
• SPEC flywheel, N55 2011–2012: SB55S-2 steel or SB55A-2 aluminum — see Notes

VEHICLE APPLICATIONS