Closed Deck X4 Professional Standalone Engine Management (Short Back-Order — Please Read Description)

from $229.99
MAP Sensor:

⚠ Short Back-Order Notice (Estimated arrival time: 7–10 days as of June 10, 2026)

A new batch of this product is currently on order and expected to arrive soon. You are welcome to place an order now to reserve your spot in line for the incoming inventory.

Once inventory arrives, orders will ship within 2–3 business days.

Please note: Only new orders placed while this notice is active are affected by the back-order. All previous orders have already shipped.

Thank you for your patience!

The Closed Deck X4 is our most feature-packed standalone ECU to date. Powered by the Atmega2560 and fully compatible with the official Speeduino firmware (no code modification required), it offers exceptional flexibility and capability for a wide range of engine setups and applications.

Included:

  • Closed Deck X4 ECU (assembled as pictured)

  • Harness-side connectors and pins

  • Arduino Mega 2560 "Pro" pre-flashed with latest Speeduino firmware

Electronic Boost Control Solenoid
Electronic Boost Control Solenoid
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DRV8825 Stepper Driver
DRV8825 Stepper Driver
$3.99
Dual VR Conditioner (NCV1124) Speeduino Compatible
Dual VR Conditioner (NCV1124) Speeduino Compatible
$24.99
Low-impedance Injector Resistor 5 OHM
Low-impedance Injector Resistor 5 OHM
$5.99

⚠ Short Back-Order Notice (Estimated arrival time: 7–10 days as of June 10, 2026)

A new batch of this product is currently on order and expected to arrive soon. You are welcome to place an order now to reserve your spot in line for the incoming inventory.

Once inventory arrives, orders will ship within 2–3 business days.

Please note: Only new orders placed while this notice is active are affected by the back-order. All previous orders have already shipped.

Thank you for your patience!

The Closed Deck X4 is our most feature-packed standalone ECU to date. Powered by the Atmega2560 and fully compatible with the official Speeduino firmware (no code modification required), it offers exceptional flexibility and capability for a wide range of engine setups and applications.

Included:

  • Closed Deck X4 ECU (assembled as pictured)

  • Harness-side connectors and pins

  • Arduino Mega 2560 "Pro" pre-flashed with latest Speeduino firmware

Hardware feature List:

  • Supports up to 8 cylinders for both fuel and ignition, using 4 fuel channels and 4 ignition channels. Full sequential fuel and ignition for 2 (even fire only), 3, and 4-cylinder engines. Wasted spark and semi-sequential operation for 6 (even fire only) and 8-cylinder engines.

  • 4 x Fuel Injector Outputs

  • 4 x Ignition Outputs (Selectable voltage: 12V or 5V)

  • 4 x Pre-configured analog input channels (CLT, IAT, TPS, O2 sensors)

  • 5 x Customizable spare analog inputs - e.g., oil pressure, fuel pressure

  • 3 x Trigger inputs: Crank + dual camshaft position support

  • 6 x Digital inputs - e.g., Flex Fuel, Vehicle Speed Sensor, Clutch switch

  • Dual VR conditioner mount (VR conditioner not included)

  • SMD MPXH-compatible mount (sensor options selectable above)

  • Barometric pressure sensor (real-time atmospheric compensation)

  • DRV8825 mount for stepper idle valve control

  • 10 x Digital Outputs (2A max each) - e.g., Idle, Boost, VVT, Fuel Pump, Fan

  • Dedicated tachometer output

  • 2 x Serial headers (Serial0 & Serial3) - ideal for Bluetooth or WiFi modules

  • USB-C header (automatically disables Serial0 when USB is connected)

GitHub Documentation:

Open Source and Customizable:

Full control with open-source hardware and firmware.

Affordable and Reliable:

Serious performance without the high price tag.

Backed by a Big Community:

Lots of guides, support, and real-world experience available.

Tested Before Shipping:

Every ECU is tested to ensure top quality and reliability.