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Why change your Final Drive?

  • Author: Timon Alferink

  • 30 Aug 2017

There are multiple reasons why you want to change your final drive. If you have an OEM final drive, you probably want to increase reliability and lifetime. If you already have a motorsport final drive, you probably want to create the perfect gearing for your car and track. Both reasons are highlighted below.

Final Drive Ratio

Choosing your right gearing is all about ‘compromise’. A lower (taller) gear ratio provides a higher top speed, and a higher (shorter) gear ratio provides faster acceleration. . Besides the gears in the transmission, there is also a gear in the rear differential. This is known as the final drive, differential gear, Crown Wheel Pinion (CWP) or ring and pinion.

In the table below you can see the top speed in each gear for different final drive ratio’s. If  you want to know the car details such as maximum RPM and gear ratio’s, click .


BMW E92 – DG400 Gearbox

Max. Rpm8000RPM
Wheel R311,5mm
GearPrim.Sec.Ratio
113372,84
215322,13
316281,76
418271,50
521271,28
623261,13
FD11454,10

GearFinal drive ratio
4.104.755.28
1st817063
2nd1089384
3rd130112101
4th153132119
5th179155139
6th203175158
Torque increment0%15,8%28,7%

 

You can see the reduction of top speed (from 203km/h to 158km/h), while the acceleration torque increases (28,7%). As said before, it’s all about compromises. You are sacrificing either torque for top speed, or top speed for torque.

Motorsport Final Drive

The OEM final drives are designed for the specifications of that specific car. If you are upgrading your car, or increasing engine power, the OEM parts of the drivetrain will have a higher failure risk. Upgrading your drivetrain components is necessary, since a chain is only as strong as its weakest link.

Characteristics of a Motorsport Final Drive

  • Cyclo palloid gear shape
  • Small batches
  • High-grade steel
  • Custom ratio’s
  • More strength in same package size

In the next blog the differences between Gleason, Klingelnberg and Oerlikon gear shapes and manufacturing will be explained. Please comment or share if you would like to read more blog posts on this subject! If you want to find out more technical specification on final drives, please consult the catalog.

Gear table
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