The Mk1, Mk2 and Mk2.5 MX5 was fitted with a number of different differentials, the type of differential AND the finnal drive ratios vary according to model, gearbox and market the car was sold in.

There were two types of differentials fitted to MX5s built between 1989 and 2005. These are:

• Open Differential
• Limited Slip Differential - LSD

As a general rule, imported cars had limited slip differentials except automatics which always have open differentials.

The MX5 (1989 to 2005) had three types of limited slip differentials fitted. These were:

• Viscous
• Torsen Type 1
• Torsen Type 2

The final drive or differential ratio will depend on the market the car was originally sold in and the model of the car.

The ratios range from:

• 3.636:1
• 3.909:1
• 4.100:1
• 4.300:1

The ratio tells you how many times the prop shaft has to go around to turn one revolution of the wheels. So the highest gearing is the 3.6:1 ratio, a nice differential for the motorway.

The Crownwheel and Pinion determine the differential or final drive ratio.

This is a 4100:1 Crownwheel and Pinion.

You can change Crownwheels and Pinions (providing they match) between MX5 differentials (not 1.6 Mk1) but it takes skill and some time to set these up properly.

Viscous Differential - 1.6 Mk1 Cars Only

A viscous differential contains a silicone fluid. When a wheel spins, the fluid in the spiining side gets thicker and causes the transfer of motion to the other side.

Torsen Type Differentials

Torsen differentials provide lockability in a more mechanical way.

Type 1 or Type A - uses crossed axis helical gears to transfer torque across axle

Type 2 or Type B - uses parallel helical gears to do the same thing

You can fit a 4.655:1 ratio crownwheel and pinion to a MX5 differential. We undertake this specialist work. This differential ratio is beneficial to those who require additional performance but it is produced for motorsport application only. Click here for more information.

Pictures coming soon

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