Stop Trusting Your Build to a 30-Year-Old ECU

You have invested serious time and money into your Honda or Acura build.

The last thing you want controlling your engine is an old ECU that has already survived decades of heat cycles, vibration, moisture, corrosion, and unknown repairs.

That is exactly why the Hondata S300 Pro ECU Package was created.

Instead of starting with a worn-out factory circuit board and hoping it survives, this package begins with a new-production OBD1 P28-spec ECU circuit board.

Through a collaboration with The ECU Guy and Herse-Tuning, this stunning purple circuit board was developed to reproduce the functionality and factory pinout of an original Honda OBD1 P28 ECU.

The result is a clean, modern, full-featured engine-management solution built for naturally aspirated, turbocharged, distributor, and coil-on-plug Honda and Acura applications.

A New Foundation for Your Honda Build

This is not simply an old, refurbished ECU with an S300 installed.

The new-production circuit board is assembled using approximately 80% brand-new electronic components, including:

• New resistors
• New electrolytic capacitors
• New ceramic capacitors
• New integrated circuits
• New supporting electronic components

Every component that is still available new is sourced and installed.

Components that are no longer manufactured, including the original Honda main processor and other application-specific components, are sourced from OEM Honda ECU inventory and professionally transferred to the new circuit board.

This gives you the benefit of new-production electronics while retaining the original Honda components required for proper operation.

Brand-New Hondata S300V3 Installed

Each ECU includes a brand-new Hondata S300V3 tuning system fully installed and tested.

The Hondata S300V3 gives your tuner access to the critical calibration tables and features needed to properly tune your engine.

Whether your build is a basic naturally aspirated street car, a high-compression all-motor setup, or a high-horsepower turbo application, the S300V3 provides the control needed to properly calibrate the engine.

This is a complete ECU with the Hondata S300V3 fully installed.

You are not purchasing an empty ECU or an installation service. The Hondata S300V3 hardware is included, installed, and tested before the ECU is shipped.

PWM Boost Control and Boost by Gear

The PWM boost-control circuitry is already installed, allowing the ECU to operate a compatible electronic boost-control solenoid.

This allows your tuner to configure features such as:

• Electronic boost control
• Boost by gear
• Adjustable boost targets
• Improved traction management
• More consistent boost pressure
• Reduced wheelspin in lower gears

Instead of applying maximum boost in every gear, boost pressure can be managed based on the vehicle’s gearing and available traction.

This is especially useful for high-horsepower front-wheel-drive Honda and Acura applications.

Prepped for Coil-on-Plug

Coil-on-plug headers are preinstalled, making the ECU ready for a compatible coil-on-plug conversion without requiring additional internal ECU modifications.

You are not required to use coil-on-plug.

This ECU can still be used with:

• A factory Honda distributor
• A compatible coil-on-plug conversion kit
• A Hondata CPR ignition system

Whether you are installing coil-on-plug immediately or planning to upgrade later, the ECU is already prepared.

Factory OBD1 P28 Pinout

This ECU uses the standard OBD1 P28 ECU pinout.

If your vehicle or engine-swap harness is already correctly wired for a P28-spec ECU, no ECU pinout changes should be required.

Connect the ECU, load the correct calibration for your engine combination, verify the vehicle’s wiring and mechanical setup, and complete the required tuning process.

Premium Powder-Coated ECU Case

Performance matters, but the finished appearance matters too.

Each ECU is installed in a professionally finished enclosure featuring:

• Powder-coated ECU casing
• Clear upper and lower covers
• New stainless-steel screws
• Visible purple circuit board
• Clean, professional presentation

This is an ECU you will be proud to install and display in your build.

What Is Included?

• New-production OBD1 P28-spec ECU circuit board
• Approximately 80% brand-new electronic components
• Brand-new Hondata S300V3 tuning system
• Professional Hondata S300V3 installation
• PWM electronic boost-control circuitry
• Boost-by-gear capability
• Preinstalled coil-on-plug headers
• Powder-coated ECU casing
• Clear upper and lower ECU covers
• New stainless-steel hardware
• Complete ECU assembly
• ECU testing before shipment

What Do I Need to Use This ECU?

You will need:

• A Windows-compatible laptop
• At least one available USB port
• An internet connection for Hondata registration
• Hondata SManager software
• A properly wired OBD1-compatible vehicle or conversion harness
• A basemap or professional calibration for your exact engine setup

Computer and operating-system compatibility may depend on the current version of Hondata SManager. Confirm that your computer meets Hondata’s current software requirements before purchasing.

Important Wiring Harness and Support Policy

This ECU must be installed with a properly manufactured, correctly pinned, and fully functional engine or conversion harness.

Kugan Tuning will not provide setup assistance, wiring diagnostics, no-start diagnostics, troubleshooting, or technical support for vehicles using Carrot Top Racing, Jackspania, or similar harnesses.

Purchasing this ECU does not include diagnosing or repairing problems caused by:

• Engine wiring
• Conversion-harness wiring
• Incorrect pin locations
• Loose or damaged terminals
• Poor grounds
• Damaged sensors
• Incorrect sensor wiring
• Ignition-system wiring
• Injector wiring
• Vehicle-side electrical problems
• Improper installation

Customers using one of the listed harnesses, or a similar harness, will be responsible for diagnosing and correcting all wiring and installation issues before ECU or tuning support can continue.

We strongly recommend using a proven, professionally manufactured harness from a reputable supplier.

Who Is This ECU For?

This ECU package is ideal for:

• Honda and Acura engine swaps
• Naturally aspirated performance builds
• Turbocharged street cars
• Dedicated race cars
• High-horsepower front-wheel-drive builds
• Boost-by-gear applications
• Coil-on-plug conversions
• Customers replacing an aging factory OBD1 ECU
• Builders who want a clean, professional, ready-to-tune ECU solution

Important Tuning Information

This ECU does not arrive with a universal tune that is safe for every engine combination.

Your calibration must match your exact setup, including:

• Engine displacement
• Injector size
• Fuel type
• MAP sensor
• Intake manifold
• Throttle body
• Camshafts
• Compression ratio
• Turbocharger or supercharger
• Boost pressure
• Ignition system
• Additional engine modifications

Do not operate the engine under load or boost until the ECU has been properly configured and the calibration has been verified for your combination.

A basemap is only intended to provide a starting point. It is not a replacement for professional tuning.

Your Engine Deserves Better Than an Unknown Used ECU

A used factory ECU may look fine from the outside, but you cannot always see leaking capacitors, damaged circuit-board traces, corrosion, heat damage, previous repairs, or failing internal components.

Your ECU controls critical engine functions, including:

• Fuel delivery
• Ignition timing
• VTEC operation
• Rev limits
• Boost control
• Engine protection strategies

Reliability is not the place to cut corners.

The Hondata S300 Pro ECU Package gives your Honda or Acura build a new-production foundation, advanced tuning capability, boost-control support, coil-on-plug preparation, and a premium finished appearance.

Build it once.

Tune it correctly.

Drive it with confidence.