Differential Swaps

The MX5 NC has a small case differential housing a 7" pinion and the NC MX5 was only available with a limited number of ratios. For many short course racing such as hill climbs, sprints and circuit racing the standard diff ratios might be too long, and you might favour quicker acceleration over maximum top speed.

We can offer the components to swap your differential from the standard MX5 unit to the larger and stronger 8" pinion RX8 diff, which have shorter ratios available, or using a short ratio gearset to increase acceleration.

Get in touch to discuss your requirements and we can go through your option.

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MX5 6-Speed & MX5 6-Speed Differential

Standard factory configuration with 178mph theoretical top speed @ 7500rpm with a tyre diameter of 24.72"

MX5 6-Speed & MX5 5-Speed Differential

Easiest Conversion using a 5-speed differential with 162mph theoretical top speed @ 7500rpm with a tyre diameter of 24.72"

MX5 6-Speed & RX8 4.44 Differential

Easiest to find RX8 differential conversion Standard factory configuration with 149mph theoretical top speed @ 7500rpm with a tyre diameter of 24.72"

MX5 6-Speed & RX8 4.77 Differential

Late model and harder-to-find RX8 differential conversion Standard factory configuration with 139mph theoretical top speed @ 7500rpm with a tyre diameter of 24.72"

124 Spider & MX5 3.727 Differential

Things get interesting when we look at the 124 Spider gearset conversion, which can negate the need to convert to an RX-8 final drive, or used in combination with.

Here's the Spider gearset with the 3.727 final drive configuration with 175mph theoretical top speed @ 7500rpm with a tyre diameter of 24.72"

124 Spider & MX5 4.1 Differential

Things get interesting when we look at the 124 Spider gearset conversion, which can negate the need to convert to an RX-8 final drive, or used in combination with.

Here's the Spider gearset with the 4.1 final drive configuration with 159mph theoretical top speed @ 7500rpm with a tyre diameter of 24.72"

124 Spider & RX8 4.44 Differential

Here's the Spider gearset with the 4.4 final drive from the RX8 with 148mph theoretical top speed @ 7500rpm with a tire diameter of 24.72"

124 Spider & RX8 4.77 Differential

Here's the Spider gearset with the 4.77 final drive from the RX8 with 137mph theoretical top speed @ 7500rpm with a tyre diameter of 24.72"

All suggested modifications and recommendations on this website are intended solely for use on vehicles participating in closed-course, Circuit competition events, races and public track days.

Vehicle modifications and installation of parts mentioned on this website may cause the vehicle warranty to be voided and may cause the vehicle to be unable to be lawfully used on a public highway. You are responsible for compliance with any and all applicable local laws, rules and regulations, and you accept all responsibility for modifications to said vehicle(s) and all potential risks. Although the specifications, features, illustrations, equipment and other information contained in the site are based upon up-to-date information, and while Performance Delta makes all commercially reasonable efforts to ensure that all material, information and graphics on this site are correct, accuracy cannot be guaranteed, and Performance Delta makes no warranties or representations as to their accuracy.