Speeduino

Revision as of 20:54, 14 March 2022; view current revision
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Speeduinoᴳ is the new open-source DIYᵂ engine ECU. It can run ignition-only, EFI-only or both. It can trigger COP or coil packs. It uses the Arduino Mega 2560ᴳ ($23 as of 2022) and reportedly works well☁ with many Arduino clones (as inexpensive as $13). Speeduino Australia, but also sold in USA and in England — see where to buy☁. Speeduino fully assembled is $160 (as of 2022) or $10 for the bare PCB board. Add sensors, wiring, and CPU and it's ready to go. The TunerStudio software even has an auto-tune feature if you add an O2 sensor.

Spark

<Speeduino> can use any many different types "decoders".

• Nissan Optical CAS such as RB, E15ET, CA18DET, SR20, etc. Configure Tuner Studio for "Nissan 360" decoder

• Ford-style #36-1 crank trigger wheel

Speeduino directly supports four 'smart' coils with built in igniters. No external ignitor is needed.

You can also use dumb COPs (2 pin type) by adding an ignitor module such as CA18DET ignitor or SR20 ignitor.

36-1

Ford-style 36-1 crank trigger wheel. Configure Tuner Studio for a "Missing Tooth" Decoder☁.

Use a common Ford VR sensor with a $25 add-on Speeduino VR Conditioner board.
Album 21532

Or, use a more expensive 3-wire Hall Sensor without needing an add-on board.

You can use Ford, Chrysler or GM twin coil packs.

Or, you can use four smart (low-current) Coil on Plug units, with two pairs wired together. See Speeduino Ignition☁

MSD/GM 3800 coil packs
Album 14632

Coil-on-Plug type on A12 engine

Tuning

Download the free TunerStudioᴳ software.

For ignition-only, start with the basic tune file (Speeduino base tune.msq). You can further edit the VE Table, AFR Table, and Spark Tables☁ using TunerStudio.

Alternatively you can generate a custom 16x16 TABLE using the Microsquirt toolᴳ. Then use the Import command in TunerStudio to load it in.

TunerStudio can also read in an MSQ file if it's in Speeduino format. This file contain the maps/tables along with all the configutation and sensor settings.

As always, test the changed Spark Curve before driving extensively. Be sure to use a quiet exhaust system so you can hear detonation. If you have trouble hearing it — for example if your muffler is loud — use Detonation Cansᴳ.

AutoTune

O2-based autotune will fine-tune the air-fuel ratios (Registered version of TunerStudio required).

2022 PRICES
* $80 Registered TunerStudioᴳ

AND

* $130 Controller with sensor and exhaust pipe bung

OR

* $55 Wideband LSU 4.9 Sensor
* $5 Connector
* $6 1-meter wideband cable
  automotive grade 20AWG TXL wire
* $75 Spartan 2 Wideband O2 Controller or $50 TinyWB controllerᴳ