RJB Auto Electronics

RJB Auto Electronics Speeduino Compatible ECU's and custom PCB designs,

Classic Car Electric repairs and faults

Bit more done on the Subaru Impreza sport EJ20 D3 ecu and it should come with a decent base tune too seeing as I’m tunin...
05/07/2026

Bit more done on the Subaru Impreza sport EJ20 D3 ecu and it should come with a decent base tune too seeing as I’m tuning one over the next few weeks on the road.

time to place all the parts
02/07/2026

time to place all the parts

Subaru EJ20 D3 93pin ecu header PCB footprint done tonight ready for my Speeduino/EpicEFI plug and play ecu
02/07/2026

Subaru EJ20 D3 93pin ecu header PCB footprint done tonight ready for my Speeduino/EpicEFI plug and play ecu

Small diagnostics and repair done this morning to a clients ecu that was accidentally damaged, luckily the 5v protection...
30/05/2026

Small diagnostics and repair done this morning to a clients ecu that was accidentally damaged, luckily the 5v protection diode did its job and clamped the 5v rail to ground protecting the other parts of the board during the high voltage incident.

Next I need to scope the ignition and injector outputs to make sure they are all ok.

On the bench later for testing, my speedy/epic Nissan 64pin that will work on anything from the CG10 to SR20, it will re...
24/03/2026

On the bench later for testing, my speedy/epic Nissan 64pin that will work on anything from the CG10 to SR20, it will require a different trigger wheel to work tho, supports ACC relay control, idle up input, extra inputs for fuel and oil pressure and fuel level sender, onboard wideband controller option and cable, VSS, 3 spare outputs via diag plug, EML control, up to 4 ign outputs and other features via jumper selection to support the different pinout combinations like S13/S14SR20 engines etc.

Nissan 64pin ECU design done for a client, supports the CG10 through to the SR20DET by adjusting a couple of link wires ...
15/01/2026

Nissan 64pin ECU design done for a client, supports the CG10 through to the SR20DET by adjusting a couple of link wires to suit the engines ever so slightly different pinouts, VR conditioner option in case they went to crank VR setup.
onboard wideband.
oil & fuel temp inputs with adjustable bias.
oil & fuel pressure inputs.
fuel tank level input with adjustable.
spare output on the diagnostics plug.
spare input to switch tables on the diagnostics plug.
EML control (sync warning / shift light options)

speeduino or EPIC-EFI firmware using the STM32F4-Mega100

Speeduino (arduino mega 2560 MCU) or EPIC EFI (STM32F767GT6 MCU) hybrid board for the nissan 64pin ecu range in the maki...
27/12/2025

Speeduino (arduino mega 2560 MCU) or EPIC EFI (STM32F767GT6 MCU) hybrid board for the nissan 64pin ecu range in the making, CG10DE through to the SR20DET supported :-)

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