Speeduino v0.4 pinout and specs

Checked against the maker's documents 27 September 2026

Speeduino v0.4 is a 40-pin wire-in Speeduino ECU on 1 connector: IDC40 (40 pins).

It has 4 injector outputs and 4 ignition outputs. The injector drivers are saturated, which means high-impedance injectors. Low-impedance ones need a ballast resistor pack or a different ECU. The ignition outputs are logic-level. Smart coils plug straight in; dumb coils need an igniter in between.

There are 2 dedicated trigger inputs, each happy with a VR or a Hall sensor. There is no knock input. Wideband control needs an external controller, usually over CAN. The MAP sensor is built in.

The maker does not list drive-by-wire outputs. There is no CAN bus, which rules out CAN dashes and CAN expansion.

Spec sheet

Which builds it suits

Of the 58 swap presets in the planner, 0 fit as they are and 0 fit with add-ons; 58 do not fit at all. Where it falls short, it is usually not enough injector output (low-side). The planner fills anything a preset leaves open with its ordinary defaults, so your own build may land differently.

It can't run the Toyota 2JZ-GTE VVTi: not enough injector output (low-side). It can't run the Ford Coyote Voodoo 5.2 (GT350, flat-plane): not enough injector output (low-side). It can't run the Subaru EJ/FA EJ20 turbo dual-AVCS (EJ207 GRB 2008+): not enough digital / frequency inputs.

Plan a build around the Speeduino v0.4

Pin table

Connector IDC40 carries 4 injector outputs, 4 ignition outputs and 2 trigger inputs.

Source: Speeduino document Speeduino_manual

Always verify against the manufacturer's manual and your tuner before wiring.