Most BMW axles from 07 onwards were manufactured with a friction welded ring gear and open differential. This can cause some headaches for installation concerning vehicle downtime while the factory differential/ring gear is separated by precisely machining the parts away.
Wavetrac Europe has now solved this for the M135i equipped with the 33107599411 3.08 axle.
Have a 2.81 Final Drive Axle? We also stock an axle for this too!
Please provide your VIN and transmission type at the checkout during ordering or prior to member of staff by email or phone so we can verify which axle and ratio are correct for you so we supply the correct axle.
Each exchange axle comes complete with the following:
Wavetrac ATB LSD
ARP Ring Gear Bolts
New, Genuine BMW Axle Seals
Backlash Setup to OE Tolerances
Precisely Machined Ring Gear
You will need to spec oil, for this application we advise for Motul Competiton 75w140.
The exchange process is a simple 2 step process you can find below.
Pay for the product + the exchange deposit and we will send out to you a 30.309.155WKFM1/M135i.
We will then refund the exchange deposit if a complete, usable (in good working order) axle is received within 10 working days. Axles which require maintenance/repair to be put into service or are not in working order will not be refunded.
Applicable Models with 3.08 Final Drive 33107599311 Axle:
1' F20, M135i, 5 doors, N55, EUR, (1B71) : Rear-axle-drive
1' F20, M135i, 5 doors, N55, EUR, (1B72) : Rear-axle-drive
1' F20 LCI, M135i, 5 doors, N55, EUR, (1V11) : Rear-axle-drive
1' F20 LCI, M135i, 5 doors, N55, EUR, (1V12) : Rear-axle-drive
1' F20 LCI, M140i, 5 doors, B58, EUR, (1S91) : Rear-axle-drive
1' F20 LCI, M140i, 5 doors, B58, EUR, (1S92) : Rear-axle-drive
1' F21, M135i, 3 doors, N55, EUR, (1N71) : Rear-axle-drive
1' F21, M135i, 3 doors, N55, EUR, (1N72) : Rear-axle-drive
1' F21 LCI, M135i, 3 doors, N55, EUR, (1Y71) : Rear-axle-drive
1' F21 LCI, M135i, 3 doors, N55, EUR, (1Y72) : Rear-axle-drive
1' F21 LCI, M140i, 3 doors, B58, EUR, (1W91) : Rear-axle-drive
1' F21 LCI, M140i, 3 doors, B58, EUR, (1W92) : Rear-axle-drive
Simply put - Wavetrac is the only gear diff on the market that does not lose all drive when one axle is unloaded. Axles become unloaded in aggressive driving, track cornering, extremely slick surfaces, etc. It happens more than most people realise.
We won’t go into torque bias ratios or the concept of how torque biasing diffs work at this point. Let’s get to how the Wavetrac affects performance:
For example, you have a conventional gear diff (OEM, Quaife, MF, OBX, Truetrac, Torsen, etc.), you're on a race track for a track day and during cornering your inside wheel bumps over the curbing. This is normal for track driving. The issue is that for the brief moments your inside tire becomes unloaded when bouncing over curbs, your other wheel is not getting drive - is not putting power down. Gear diffs need load on both axles in order to function. The result on a track (or during aggressive driving) is that there are many times when a normal gear diff supplies only intermittent power to the gripping wheel.
Now, same track with Wavetrac: the patented cam device in the Wavetrac prevents loss of drive when that inside wheel is unloaded. The device is able to generate a load inside the diff (to replace the lost load as it happens) that can then be biased to the gripping wheel - in the end making more consistent power delivery through a corner. That makes the car more predictable, and faster overall.
- Patented Carbon Fibre Bias Plate for the pinions. All other gear type LSDs run the pinions on the housing, meaning the friction from 0 miles is different to 100 miles, thus effectiveness is reduced over the life of the diff. With the Wavetrac performance is consistent with the Carbon Fibre bias plates!
- Patented Wave Profile eliminates the effect of a near to and zero load condition drive ability issues found in all other gear type ATB LSDs.
- ARP Bolts used throughout for superior faster reliability.
- 9310 steel gears run in billet or forged steel bodies.
- Manufactured & Designed in the USA
WAVETRAC: Smooth is Fast
The beauty of the Wavetrac is that it is ideally suited to high performance road cars that see track use. It is very strong, yet transparent to both driver and traction control electronics during regular driving. On the track or in spirited road use, it provides drive to both wheels without the handling issues that traditional clutch type diffs create (there is no tendency to push/understeer with a Wavetrac).
The Wavetrac outperforms other gear type differentials because unlike them, it won't lose drive when one axle is unloaded (which happens more often than you'd think).
Lastly, one of the most underrated benefits of the Wavetrac is its smooth delivery of power near the limit. Its patented design makes for a very predictable, smooth addition of power when you need it most - when things are at their limits: on the edge of traction mid-corner and using throttle to keep it there; or coming into a corner a little hot, but quickly back on it to maintain exit speed...
These situations are often subjective to the driver, but the benefit can be felt. The Wavetrac makes you faster because it lets you drive with confidence. Smooth is fast.