The idea of integrating modern technology into a classic car is always exciting. For 1990 Miata owners, the concept of adding OBD2 compatibility to enable features like digital dashboards is increasingly appealing. Inspired by Raspberry Pi-based digital dash projects that utilize OBD2 data, the question arises: can a Mk1 Miata, which pre-dates OBD2, be retrofitted with this functionality?
For those planning an engine rebuild or wiring loom overhaul, the thought of upgrading the ECU to a later, OBD2-compliant version – perhaps from a Mk2.5 Miata – is a tempting proposition. Imagine the possibilities of accessing engine data through a standard OBD2 port on your 1990 Miata! However, several key questions need addressing to determine the feasibility of this swap.
Would a later ECU be compatible with the earlier 1.8 Mk1 engine, even with a Mk2 VICS head? Beyond ECU compatibility, what about the sensors? Would a full swap to later model sensors be necessary? Furthermore, the digital speed signal requirement for OBD2 systems brings up the need for a wheel speed sensor, something not standard on the 1990 Miata.
While aftermarket ECUs like Megasquirt offer advanced capabilities, they also come with a higher price tag. For those aiming for a more budget-conscious approach, exploring the possibility of a factory ECU swap for OBD2 functionality on a 1990 Miata is a worthwhile discussion. Let’s delve into whether this is a practical upgrade or just a pipe dream.
