ACT 08-13 BMW 128i (E82/E88) L6-3.0L (N51/N52) XACT Flywheel Streetlite
If your 2008-2013 BMW 128i (E82 coupe or E88 convertible) with the N51 or N52 3.0-liter six and the six-speed manual has a rattle at idle, a clunk when you let the clutch out, or a vibration that comes through the floor at low rpm, the factory dual-mass flywheel is a common suspect. The ACT 601170 XACT Streetlite replaces it with a one-piece chromoly steel flywheel that will not wear out the way a dual-mass unit does, and it is resurfaceable at the next clutch job.
BMW fits the N52 manual cars with a dual-mass flywheel: two masses joined by internal springs that soak up engine pulses before they reach the gearbox. Those springs and the bearing between the two halves wear, and once they do the flywheel knocks and rattles and can no longer be machined. ACT's 601170 is a single-mass conversion. It is forged, CNC machined and computer balanced, has an induction-hardened 115-tooth ring gear, and offers a 240 mm friction surface. ACT lists the finished part at 16.5 lb and certifies it to SFI specification 1.1.
Because there is less rotating mass, the engine picks up and drops revs faster between shifts. The trade-off is honest: ACT states that gear rattle is expected with this conversion, because nothing is left to absorb the six-cylinder's firing pulses at idle. Most owners hear a light chatter from the gearbox in neutral with the clutch out; it goes away when you press the pedal.
With the engine warm and the car in neutral, listen at idle, then push the clutch in. A noise that changes with the pedal is in the clutch, release bearing or flywheel area. If the clutch is also slipping, do a fourth-gear roll-on from about 2,500 rpm and watch whether the tach climbs faster than road speed; our slipping diagnosis guide covers that test and how to rule out a stuck hydraulic. Once the gearbox is out, check the old flywheel's free play and face. Our dual-mass flywheel failure guide explains what is normal and what is worn, and dual-mass vs single-mass lays out the comfort trade-off.
Our listing covers the 2008-2013 BMW 128i, E82 coupe and E88 convertible, with the N51 or N52 3.0-liter six and a manual transmission. ACT's own application list for 601170 is wider and includes the 2006 325i and 330i, 2007-2013 328i (including xDrive), 2006-2010 525i/528i/530i, 2007-2010 X3 3.0si, and 2006-2011 Z4 3.0i/3.0si/sDrive30i manual cars. It does not fit the turbocharged N54/N55 cars such as the 135i; those use the 601180 Streetlite. Automatic and DCT cars use a flexplate and are not a match. If your car has had an engine or gearbox swap, send us the year and VIN before ordering.
| Brand | ACT |
| Part number | 601170 |
| Fits | ACT 08-13 BMW 128i (E82/E88) L6-3.0L (N51/N52) XACT Flywheel Streetlite |
| Vehicle fitment | BMW 128I (2008-2013) |
| Type | Flywheels |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Yes. ACT lists the 2008-2013 128i E82 and E88 with the N51 or N52 3.0L six and six-speed manual. It does not fit the 135i or any automatic car.
Yes. ACT states the 601170 works with the factory clutch kit as well as ACT clutch kits. A worn stock disc should still be replaced while the gearbox is out.
Expect some gear rattle at idle in neutral. ACT notes this on the product page because a single-mass flywheel does not damp engine pulses the way a dual-mass unit does.
ACT lists the 601170 at 16.5 lb. It is one-piece chromoly steel with a 240 mm friction surface and a 115-tooth ring gear.
Yes, ACT includes M12-1.5 x 25 mm flywheel bolts. Use them rather than reusing the old bolts.
Yes. ACT flywheels are serviceable and can be resurfaced at the next clutch replacement without buying extra parts.
