In this article we will show you how to remove the Speed Restriction from Mazda EUNOS and JDM MX5 Roadsters.
What is the EUNOS Speed Restriction?
Mazda MX5 cars made for the Japanese Domestic Market, EUNOS and later MX5 models, are required by Japanese law to restrict the speed of all cars to 180 k/mh (Kilometers Per Hour) , which is just under 112 mp/h (Miles Per Hour). If you own an early imported EUNOS or MX5, originally designed for the JDM market, it may be subject to this limitation. In this article we will show you how to remove this speed restriction for those that use, or wish to use, their imported car on a track.
De-restricting your EUNOS is a simple task, requiring only the removal of the instrument cluster, and removing a screw that operates a switch inside the speedometer.
1. Remove the cowl surrounding the steering controls by removing the screws from underneath.
2. Remove the two exposed screws that hold the bottom of the instrument cluster surround. Prize the rear of the surround in an upward direction to remove the clip from its fastening in the top of the dashboard.
3. Remove the screws holding the instrument cluster to the dashboard.
4. Unplug the two cable connectors located at the top rear of the speedometer cluster. slide the cluster forward a little, and remove the speedo cable by pressing the two tabs inwards and withdrawing the cable end.
5. Remove the cluster and using a cross head screwdriver remove the screw marked "180", as shown in the picture below.
6. Refit the instrument cluster by reversing the steps above, e.g. replace connectors and speedo cable, replace screws, replace cover and tighten the two screws. Finally, replace the cowl around the steering column.