ACT 2007 BMW 135/335/535/435/Z4 HD/Race Sprung 6 Pad Clutch Kit
ACT BM14-HDG6 is a Heavy Duty clutch kit with a ceramic six-pad sprung disc for the manual-transmission BMW 135i, 335i, 535i, 435i and Z4 sDrive35i with the 3.0L twin-turbo N54 or single-turbo N55. These engines respond to tuning with big torque gains, and the factory clutch is often the first part to give up: the car flares on a hard pull in fourth, or the rpm runs ahead when boost peaks. This kit is for owners who want a firm grip on that torque without moving to the heaviest Xtreme plate.
ACT rates BM14-HDG6 at 596 ft-lb at the crank, 94 percent over the factory clutch. The Heavy Duty pressure plate raises clamp load through ACT's diaphragm design while keeping the pedal in what ACT calls the light to moderate range. The disc is a 240 mm (9.4 in) ceramic six-pad unit on a 1.375 in input spline. Six separate pads absorb heat well and shift fast, and the spring center damps the torsional vibration a big straight-six puts through the driveline. ACT is clear that engagement is harsher than with an organic disc, so expect a more abrupt take-up in traffic.
The kit contents per ACT are the B015 Heavy Duty pressure plate, the 6240530 six-pad sprung race disc, the RB015 release bearing and two alignment tools (AT118 and AT105), with M8-1.25 x 20 mm pressure plate bolts. A flywheel is not included, and ACT states the kit must be used with an ACT flywheel.
Separate slip from other faults. A soft pedal or difficulty selecting gears points to the clutch hydraulics, not the disc. To check for slip, pull from about 2,500 rpm in fourth at full throttle and watch whether engine speed rises faster than road speed; logging rpm against speed with a scan tool makes it obvious. Our slipping diagnosis guide covers the method, and flare vs. slip helps sort out drivetrain feel. Check for oil at the bellhousing seam before you order, since an engine oil leak will glaze a new disc.
Our listing is titled for 2007 cars. ACT's application list for BM14-HDG6 is much wider: the 2008-2013 135i (E82/E88), 2007-2013 335i and xDrive (E90/E92/E93), 2011-2013 335is, 2012-2015 335i F30, 2014-2016 435i F32, 2008-2010 535i E60/E61, 2011-2016 535i F10 and 2009-2016 Z4 sDrive35i, with N54 and N55 engines and manual gearboxes. ACT splits the early N54 cars at January and February 2009, which matters for the flywheel choice below, so send us your build date or VIN and we will confirm the parts. See more in our rebuild kits section.
For smoother engagement on a street car, compare the organic-disc BM14-HDSS. For more holding power, the BM14-XTG6 uses an Xtreme plate.
| Brand | ACT |
| Part number | BM14-HDG6 |
| Fits | ACT 2007 BMW 135/335/535/435/Z4 HD/Race Sprung 6 Pad Clutch Kit |
| Vehicle fitment | BMW 135/335/535/435/Z4 Hd/Race Sprung 6 (2007) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
ACT lists the manual 2008-2013 135i, 2007-2013 335i/xi/xDrive E90/E92/E93, 2011-2013 335is, 2012-2015 335i F30, 2014-2016 435i F32, 2008-2010 535i E60/E61, 2011-2016 535i F10 and 2009-2016 Z4 sDrive35i with N54 or N55 engines.
No. ACT says it must be used with an ACT flywheel, which is sold separately. ACT offers 601030 with this kit and lists 601180 for 2007-2009 N54 cars; match the flywheel to your crank bolt pattern.
ACT rates BM14-HDG6 at 596 ft-lb at the crank, 94 percent over the factory clutch. The Xtreme BM14-XTG6 is rated higher at 702 ft-lb.
It works, but ACT notes engagement is harsher than an organic disc. Pedal effort stays light to moderate thanks to the Heavy Duty plate, so many owners accept the abrupt take-up for the heat resistance.
ACT says its race discs usually need only a few hard slips to lap in the surfaces, then normal driving. Avoid overheating the clutch while it beds in.
