Sequential injection means firing each injector separately.
MS default is batch fire, meaning two injector fire at the same time.
Miata (94 and above) run sequential from factory, each injector wire goes all the way to the ECU separately.
So, if your Miata is 94 and above you should start off with sequential injection from the start.
In order to enable sequential injection, you need to add a little module to your MS (DIYPNP only) that will add two additional drivers for the injectors.
The module:
Sequential injection gives you: better efficiency, injection timing, idle smoother, idle smoother with larger injectors, better enrichment, better throttle response.
Do it ! it's good for you !
