SPEC Stage 2+ Performance Clutch Kit (for SPEC single-mass flywheel) - E60 535i, E82 135i, E9X 335i
Tuning your N54/N55 with all of the bolt-on upgrades? Don't allow your clutch or flywheel let you down! The stock clutch is fine for a stock car or just a simple software upgrade. But anything more and it quickly becomes the weak link (especially with drag races or hard launches). The 135i/335i/535i/Z4 35i SPEC Stage 2+ clutch kit is perfect for owners who want a performance clutch that works great with simple bolt-on modifications and will have a minimum of downsides or trade-offs. SPEC has spent considerable time and effort on the 335i models to produce a performance clutch and flywheel package that holds up to track and drag strip demands but is also easy to live with for daily driving. This clutch kit is meant to be used only with a SPEC flywheel.
What was most important to them was offering a kit that has stock-like clutch pedal effort but will grab and hold when the car has been mildly tuned. Full bolt-on upgrades like software, intake, FMIC, E85 mix, or methanol demand a better clutch. The Stage 2+ with the flywheel has a peak torque rating of 545ft-lbs. With the SPEC single-mass flywheel the limitations of the stock flywheel are eliminated. The clutch in this Stage 2+ kit is self-adjusting, like the factory design, and the engagement point can be adjusted. The clutch disc has a sprung hub so it can be used with the single-mass flywheels with near-stock levels of noise, vibration, and refinement. See comments below for characteristics of each.
The Stage 2+ can be configured a few different ways depending on how you intend to use the car -
SPEC steel flywheel
occassional drag strip
|Use this with the SPEC steel single-mass flywheel.
The clutch will be stiffer than the factory design but it will grab harder and stay connected with far less chance of slippage. The engagement point is changed but most drivers adjust within the first 100 miles. The failure-prone dual-mass flywheel is eliminated and a steel single-mass is used instead. Expect more noise and vibration from the steel but better reliability and slightly better performance.
SPEC aluminum flywheel
|more drag strip than street||Use this with the SPEC aluminum single-mass flywheel.
The clutch will be stiffer than the factory design but it will grab harder and stay connected with far less chance of slippage. The engagement point is changed but most drivers adjust within the first 100 miles. The failure-prone dual-mass flywheel is eliminated and a lightweight aluminum single-mass is used instead. Expect a lot more noise and vibration with aluminum ("gearbox rattle") but better reliability and better performance. The engine will rev a lot faster too.
This clutch is what we recommend if your tuning plans will only be bolt-on upgrades and you want to eliminate the dual-mass flywheel (as a potential failure point). If you plan to go beyond bolt-ons, such as upgrading turbos or single turbo, we strongly recommended using the Stage 3+ clutch. The Stage 2+ offers the best drivability for 90% of the tuned 335s out there but when going beyond bolt-on upgrades it would be best to go to a more advanced clutch stage.
SPEC Clutch is one of the premier clutch and flywheel suppliers to the tuner market. They are often found on the most highly tuned import and domestic vehicles. They are recent players in the German car community with a special focus on the newer turbo BMW models with high torque output. SPEC has been proven time after time to provide superior performance, drivability, and longevity to the most hardcore enthusiasts around the globe.
E9X 335 SPEC Clutch Stage 2+ Kit contents:
+ carbon/semi-metallic and Kevlar clutch disc
+ heavy-duty pressure plate
+ heavy duty throw-out bearing
+ pilot bearing
+ clutch fork
+ alignment tool
Additional items we recommend:
pressure plate mounting bolts
flywheel mounting bolts (if removing flywheel)
rear main seal (if car has more than 70,000 miles)
input shaft seal
output shaft seal
This item fits the following BMWs:
2008-2013 E82 BMW 135i 135is 1M Coupe
2007-2013 E90 BMW 335i 335xi 335i xDrive - Sedan
2007-2013 E92 BMW 335i 335is 335xi 335i xDrive - Coupe
2007-2013 E93 BMW 335i 335is - Convertible
2008-2010 E60 BMW 535i 535xi 535i xDrive
2009+ E89 Z4 Z4 35i Z4 35is (from February 2009 production date)
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