Basic MS3 99-00

The first and best MS3 plug and play ECU for the 99-00 1.6L/1.8L Miata/MX-5. Fully loaded, with many free inputs and outputs, advanced knock control, USB port and accessible SD card slot, this is a motorsport-level ECU for the hobbyist's budget.

Works with all 99-00 versions: 1.6L/1.8L, US/EU/JDM (Miata/MX-5/Roadster). Also works with the JDM RS model.


Overview

The Basic MS3 is our first MS3-based plug and play ECU for the Miata/MX-5.

This ECU is the first step towards a motorsport-level performance vehicle modification, as not only does it handle everything needed by the engine to run smoothly and produce more power in the entire powerband compared to the stock ECU, but it also has many features required by a track-oriented car.

This includes launch control, anti-lag, pit limiter, failsafes, SD card datalogging and more.

The ECU-regulated alternator is fully supported. This ECU will also control the battery light and VICS (variable intake control system).

The Basic MS3 series is inherently plug and play, with no adapter harness needed. No soldering, wire cutting or splicing is required. It is however highly recommended that you remove the MAF and that you replace the stock IAT (Intake Air Temperature) sensor with an open-element IAT sensor if you plan on adding a turbocharger or a supercharger. This is recommended for 3 reasons:

  • 1) The stock plastic sensor does not respond to temperature changes quickly enough during boost rise.
  • 2) The placement of the IAT sensor before a turbo/supercharger means that the IAT sensor will not measure the actual air temp as it goes into the engine: the air temp changes due to the compression of the air, and the cooling effect of an intercooler/chargecooler.
  • 3) The stock IAT sensor is not threaded, so placing it after the boost source means it will simply pop out under boost

Please note: This ECU can work with any 99/00 Mazda Miata/MX-5: This means both the 1.6L (available in Europe, Japan and elsewhere but NOT in the US) as well as the 1.8L. It will also work with cars equipped with a factory immobilizer system.