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The ONLY Helical LSD on the market with hassle free variable-rate torque biasing
Through our patent-pending VTB system, users can fine tune their own Bias Ratios at the track and at no additional cost, simply by adding/removing the included coil springs. With the MFactory VTB LSD, up to 85% torque bias can be transferred to the wheel with traction! A must-have for serious circuit use. All MFactory VTB LSD's are pre-set to 75% torque bias (unless otherwise requested).

For the technically inclined:
- When driving in a straight line (or minute manoeuvring), torque will be split approximately 50/50 between the left/right axles and the internal gears of the differential will effectively be inoperational.
- If your vehicle axle speeds start to differentiate (i.e during cornering), the differential will compensate for this by biasing the axle speed of the faster spinning axle in direct proportion to the slower spinning axle. If the left axle is spinning 10% above nominal, the right axle will spin 10% slower as the left/right axles in the differential are locked together via the internal gears in opposing directions. 60% + 40% = 100%, with nominal being 50%.
- But if this is the case, then why would a vehicle that is stationary but spinning one wheel not move? This is because it is the differential housing that is providing the forward rotational movement (thus the spinning axle is rotating forward), with the stationary axle rotating backwards internally via the differential gears, effectively cancelling out the forward rotational movement of the differential housing.
- If you had 75% torque bias, this means that the stationary axle will receive 3 times the amount of torque of the spinning axle, but due to there being minimal torque transfer to the spinning axle (which has minimal or zero load, thus spinning purely on momentum), the stationary axle will not have enough torque to move the mass of the vehicle on it's own.
- This is where a pre-loaded differential comes into play. By pre-loading the internal gears of the differential, this simulates load on the axles, thus increasing the amount of torque being transferred through the differential. Once this increase in torque becomes sufficient enough to overcome the mass of the vehicle, the vehicle will start moving. With a 75% torque bias, if the spinning axle has only 20lbft of torque (which may be insufficient), the stationary axle will have 60lbft of torque going through it which is enough to start moving the vehicle.
- This applies to ALL torque-biasing differentials, however, the implementation of the pre-load system is the differentiating factor between the various LSD's on the market

Unlike all other Helical LSD's on the market, the MFactory VTB LSD uses a coil spring pre-load system, NOT Belleville spring washers. Our coil springs provide a smoother transition of load and do not lose their spring rate like spring washers do.

No-Load/One-Wheel Syndrome
The common problem with most Helical LSD's on the market is during a no-load situation (such as limited traction/ice/lifting a wheel), you may experience zero drive to the wheel with traction, depending on electronic slip intervention (e.g Traction Control).

Some of our competitors try to solve this issue by either increasing the pre-load (via Belleville spring washers) or by incorporating a mechanism to lock one axle during a no-load situation. Unfortunately, due to insufficient torque transfer, this will not provide sufficient drive to the opposing axle on a stationary vehicle. For standing-start applications (or if your vehicle is stuck on ice), it has proven to be insufficient in most cases.

With the patent-pending VTB system, which utilizes dual-pulsing cam technology, both axles are drive-locked, yet can still rotate independently of each other (unlike a Spool), similar to a regular Helical LSD. Due to being in a 100% constant state of torque-biasing, the MFactory VTB LSD will function both on & off throttle, similar to a Plate-type LSD.

The MFactory VTB LSD is the ONLY Helical LSD on the market that is a true hybrid of a Helical LSD (smoothness, noise-free, maintenance-free) and a Plate-type LSD (variable torque/load settings, increased traction under most situations).

Proprietary Friction Discs
To enhance durability and increase frictional performance, all MFactory VTB LSD's incorporate our proprietary friction discs between the gears and LSD housing. Unlike most common Helical and Plate-type LSD's on the market that lose performance over time, the MFactory VTB LSD will provide the same level of performance over the lifetime of the LSD.

Hybrid Ceramic Bearing Technology (Application Dependant)
Depending on application, the MFactory VTB LSD will be supplied with our new Hybrid Ceramic Diff Bearings. Not only are our bearings stronger and more durable, they also offer the epitome of near-zero rotational friction, minimizing parasitic drivetrain losses, thus transferring more power to the ground!

3rd Generation Design
The MFactory VTB LSD is lighter, stronger and more efficient than any other Torque-Biasing Differential on the market today!

VTB System Upgrade (Application Dependant)
Already run a regular Helical LSD and were thinking of upgrading? For select applications, we are proud to offer our patent-pending VTB System as an independent aftermarket upgrade to existing MFactory Helical LSD's. The upgrade kit includes: VTB System + VTB Gears + New Case Bolts.

Diamond Cut to exacting tolerances from Forged High-Nickel-Chromium-Molybdenum Steel
Perfect fitment & finish ensures hassle-free installation & maintenance, each and every time.

Designed using leading-edge Solidworks 3D CAD & Cosmos FEA software
Advanced Gear Geometry minimizes parasitic drivetrain losses. Race transmissions built with MFactory components transfer, on average, 1-2% more power to the ground over our competitors!

Covered by the MFactory Lifetime, Globally Transferable Warranty
Whether used on the Street, Strip or Track, all MFactory VTB LSD's come with a Lifetime, No-Hassle, Globally Transferable Warranty.

Maintain a leading advantage over the competition with the patent-pending MFactory "Variable Torque Biasing" Limited Slip Differential. Through the smooth and constant distribution of power to the wheels, the MFactory VTB LSD puts the power-to-the-ground and maximises your vehicle's traction. A must for any race car, be it Street, Strip or Track!

Specifications
  • Made from imported Japanese SAE 4320 & SAE 9310 Steel
  • Forged, Double Tempered and Super Sub-Zero treated for unsurpassed toughness
  • Advanced Shot Peening technology increases surface hardness
  • Designed to withstand the extreme shock loads of competition-level Drag Racing
  • Advanced gear geometry designed using industry-leading software puts more power to the ground
  • Only the highest quality Brighton-Best Hardware is used
  • Maintenance-free Gears eliminates the need for special fluids & rebuilds associated with Plate-type LSDs
  • Smooth Helical Gear operation ensures no adverse affect to steering response, unlike with Plate-type LSD's
Fitment Notes

Honda B16A2 Fitments: Will not directly fit models previously equipped with an OEM Viscous LSD, and will require a Ring Gear change

BMW 135i MT/335i 07+ MT/DCT/335d Fitments: Will not directly fit these models due to the oem Ring Gear being welded onto the differential. The Ring Gear will either need to be machined to accept the new LSD, or a new bolted Ring & Pinion used. MFactory Competition Products is one of only 3 companies in the US that can provide this service that meets oem tolerances, and the only US company to manufacture precision aftermarket performance Ring & Pinions (Final Drive Gears) for the BMW

Click to view larger image:

MFactory Competition Products will provide a limited lifetime warranty for all VTB LSD's to be free of defects in materials and workmanship upon receipt of product and professional installation. Parts returned must be determined by MFactory Competition Products to be defective before any warranty credit or replacement is issued

MFactory Competition Products's obligation under warranty shall be limited to repairing or replacing, at its option, any part proven defective. The customer must prepay transportation charges

Final determination of the suitability of the products for the use contemplated by the buyer is the sole responsibility of the buyer. MFactory Competition Products shall not be liable for any special, direct, indirect, incidental, or consequential damages, that might be claimed as a result of the failure of any part, including claims for delay, loss of profits, or labor

MFactory Competition Products shall not be liable for any damage or injury to persons or property resulting from improper installation or misuse of any part subject to this warranty

There are no other warranties expressed or implied extending beyond those set forth above

INSTALLATION: Any warranty claims arising as a result of the failure of a VTB LSD will ONLY be entertained if the LSD was professionally installed.

RECOMMENDED BEARINGS: When ordering your MFactory VTB LSD, we highly recommend that you order our new Hybrid Ceramic Diff Bearings at the same time.
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