4.10 Final Drive Gear & Pinion by MFactory
YCW Engineering

YCQ-FD-410

4.10 Final Drive Gear & Pinion by MFactory

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Building the ultimate response engine

I've documented my quest to reach the ultimate S65 response build by lightening the drivetrain with a billet carbon steel flywheel by TTV, and Carbon Fiber Driveshaft by Mfactoy.

The next step is to shorten gears by increasing the final drive ratio on our M cars. More torque through the differential means more power to the ground, staying in the power band of our highly strung engines. The advantages of shorter gears is mostly seen at speeds below 200kph / 120mph. See the gearing calculations at the botom of this apge. 

Unfortunately, sourcing gear & pinion sets is a difficult undertaking. Most options need to be bought used and reconditioned, or bought new at high prices from BMW. I have been looking for a factory to offer an aftermarket gear & pinion set for most BMW M cars in DCT, SMG and MT. 

I chatted with Michael at MFactory & YCW Engineering, and he immediately took notice of our interest. They manufacture the 

Built by an OEM Supplier: MFactory

MFactory is a fundamental supplier to the OEM & aftermarket drivetrain industry and are ISO regulated. 

Here are some highlights. 

  • Official OEM to Honda of America's Motorsports Divisions
  • Official OEM to Toyota Motorsports Europe
  • World's Largest Manufacturer of Forged Performance Transmission Components for Japanese and European Automobiles
  • North America's Largest Manufacturer of Limited Slip Differentials for Japanese and European Automobiles
  • North America's Largest Honda/Acura Performance Transmission Specialist
  • North America's Largest BMW Performance Drivetrain Specialist

Due to non-disclosures, MFactory cannot list all of their clients publicly. 

Every product within the MFactory catalog is designed in-house in the USA and manufactured in-house to our own specifications at both our US R&D Facility and in their Taiwan factory, before being tested & developed in the real-world on state-of-the-art race vehicles from North America, Europe and Asia-Pacific.

To support their brand, MFactory offers a 30 day money back guarantee. 

Specifications

  • 3.45, 3.62, 3.91 and 4.10 ratios 
  • Compatible with OEM M Variable LSD or aftermarket LSD
  • Forged raw materials imported from Japan
  • SAE 8620 specifications: post-treatment Tensile U/Y Strength of over 900/550 MPa and HRC 61
  • CNC machined to precise specifications
  • Secondary Heat Treatment: State-of-the-art Case Hardening procedure achieved via computer-controlled Gas Carburization and Quenching
  • Double-Tempering: A superior heat treatment technique used to decrease the brittleness and increase the toughness of their parts
  • Surface Grinding: Through the use of state-of-the-art diamond grinding machines, they ensure all parts are smooth, precise and free of burrs
  • Super Sub-Zero Processing: An advanced treatment technique whereby the parts are cryogenically hardened at -300°F, realigning the steels crystalline structure for maximum strength, then heat tempered again for a 3rd time to ensure maximum toughness (resistance to fracture)
  • Micro-Peening Treatment: the parts are subject to a high speed shot blast with our proprietary micro media, creating a super smooth surface
  • WPC treatment optional 

Installation Notes

  • 3.62 MDCT E9X M3 applications will require TCU remap and a new MT differential cover
  • Professional installation highly recommended. This is not a DIY. 

Gearing Calculations

Uses stock 3.85 MT as baseline

Ratio / Speeds

20-100km/h

20-160km/h

20-200km/h

20-250km/h

50-250km/h

100-250km/

150-250km/

MT 4.10

3.9%

2.6%

2.5%

2.2%

0.5%

-0.1%

-0.1%

DCT 3.15

-1.1%

 =0.0%

0.6%

0.6%

2.0%

2.7%

0.8%

DCT 3.45

4.5%

3.9%

4.1%

3.6%

2.7%

2.5%

2.1%

DCT 3.62

6.6%

6.0%

5.9%

5.2%

2.9%

3.3%

2.0%

 

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