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 M140i 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.

The Wavetrac® differential uses a patent pending design to improve grip in low traction conditions. Unlike any other helical gear diff on the market, the Wavetrac®’s behavior can also be fine-tuned in the field with optional components.
The Wavetrac® Differential will give you quicker acceleration and faster cornering by driving both drive wheels instead of just one. And, it offers improved no-load performance when compared to other helical gear differentials on the market.

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.

• Wavetrac ATB LSD
  
• ARP Ring Gear Bolts
  
• New, Genuine BMW Axle Seals
  
• Backlash Setup to OE Tolerances
  
• Precisely Machined Ring Gear

PLEASE NOTE

You will need to spec oil, for this application we advise for Motul Competition 75w140.

• If you lift a wheel, all gear diffs except Wavetrac®, will NOT power the other wheel.
• During the transition from accel to decel, all gear diffs except Wavetrac®, do nothing.
• The patented Wave hub improves driveability and performance during performance driving.
• The pinions in the Wavetrac run on patented Carbon Fibre bias plates in the housing. Whereas all other designs run the pinons directly on the steel housing. Overtime, with the metal on metal contact with other ATB designs friction can reduce and with this performance reduces. The carbon fibre bias plates in the Wavetrac create a consistent friction surface for the life of the differential for consistent performance.
• Its gear tooth forms are optimised for strength and improved oil film retention over competitive designs.
• gear package is smaller, reducing overall mass, yet is more durable since particular attention was paid to the tooth strength - optimised for high torque conditions.
• The internal gears are made from high strength 9310 alloy steel.
• The diff bodies are machined from case-hardened steel billet.
• Every Wavetrac® differential is built exclusively using high quality, high strength fasteners from ARP®, the world leader in fastener technology
• Direct comparison between Wavetrac & Quaife: 
• Wavetrac maintains function throughout the corner
• Quaife performs like an open diff throughout the corner, sending power to the inside wheel and slowing momentum (you can see on the dash in that youtube video wheel speed increases but the vehicle speed does not)
• Wavetrac has a Lifetime, transferable warranty in all use cases including road, track, professional Motorsport, drag strip, rally etc

Here is an overview of the Advantages of a Wavetrac over plate LSDs

• Wavetrac requires zero maintenance. Plate LSDs require frequent servicing to maintain performance. As they are used the friction plates wear and performance drops off.
• Wavetrac does not increase Noise Vibration or Harshness. Noise Vibration & Harshness is comparatively higher and much more noticeable on a plate LSD.
• Wavetrac allows for chassis stiffness to be setup comparatively softer vs. a plate style LSD as you are not overcoming an locked axle on turn-in. This improves overall mechanical grip, allowing for more setup variation.
• Wavetrac never locks harshly, improving longevity of driveline components i.e. driveshafts.
• Wavetrac has a Lifetime, transferable warranty in all use cases including road, track, professional Motorsport, drag strip, rally etc whereas plate differentials typically come with no warranty or a very limited warranty 

Fully Built LSD option

• Wavetrac ATB LSD
• OE BMW ring gear bolts
• New, Genuine BMW Axle Seals
• Backlash Setup to OE Tolerances
• Precisely Machined Ring Gear

• 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
  
• 2' F22, M235i, Coupe, N55, EUR, (1J71) : Rear-axle-drive
  
• 2' F22, M235i, Coupe, N55, EUR, (1J72) : Rear-axle-drive
  
• 2' F22, M235i, Coupe, N55, USA, (1J73) : Rear-axle-drive
  
• 2' F22, M240i, Coupe, B58, EUR, (2G11) : Rear-axle-drive
  
• 2' F22, M240i, Coupe, B58, EUR, (2G12) : Rear-axle-drive
  
• 2' F22, M240i, Coupe, B58, USA, (2G13) : Rear-axle-drive
  
• 2' F23, M235i, Convertible, N55, EUR, (1M11) : Rear-axle-drive
  
• 2' F23, M235i, Convertible, N55, EUR, (1M12) : Rear-axle-drive
  
• 2' F23, M235i, Convertible, N55, USA, (1M13) :

Please Note: Not available for xDrive models, if you have an xDrive model and require this option, please contact us and we will do our best to assist.

To ensure the part(s) you have ordered fits your vehicle, we run a compatibility check prior to dispatch. We can do this either using your registration number(UK) or the last 7 digits of your VIN. Simply enter your car details prior to checkout.

30.309.155WKFM1

Manufactured by

Wavetrac

Warranty

Wavetrac Differential Limited Lifetime Warranty