The JDM PROM Performance Chip is a vehicle performance enhancement module designed to interface with a vehicle’s onboard diagnostic (OBD) system. Marketed as a “plug and play” solution, the device aims to improve horsepower, torque, fuel economy, and throttle response. The chip is available in blue and white versions, both featuring a flexible OBD cable. Installation is reported to be straightforward, involving connection to the OBD-II port and a learning process that can take up to two weeks to complete. The device is claimed to be custom-programmed for specific vehicles and operates by modifying data transmitted to the engine control unit (ECU) without replacing it, thereby retaining original engine safety functions.
Understanding the JDM PROM Chip’s Technology
The JDM PROM Performance Chip utilizes a complex circuit board incorporating a Microchip PIC18F4580 microcontroller with 32KB of programming memory. This microcontroller is a CAN Bus and CAN FD Bus compatible chip. The board also includes a 20mhz resonator, which is noted as being more accurate than lower-cost internal oscillators found in some competing products. Examination of the OBD connections reveals that the chip connects to pins 2, 4, 5, 6, 7, 10, 14, 15, and 16 of the OBD-II port.
These connections enable the chip to interface with multiple OBD protocols, including:
- CAN (pins 4, 6, 14, 16)
- PWM (pins 2, 4, 5, 10, 16)
- VPW (pins 2, 4, 5, 16)
- ISO (pins 4, 5, 7, 16)
The ability to support these protocols suggests the chip’s broad compatibility across various vehicle makes and models. The manufacturer claims each chip is custom-programmed for a specific vehicle, requiring reprogramming for use in another vehicle.
Installation Procedure
Installation of the JDM PROM Performance Chip is described as a simple process. The following steps are outlined in available documentation:
- Locate the OBD2 port, typically found under the driver-side dashboard.
- Ensure the OBD2 port is free of dirt, dust, or grime.
- With the vehicle in the “off” position, insert the chip into the OBD2 port.
- Turn the vehicle’s ignition to the “on” position (or press the start button without starting the engine). The dashboard gauges should illuminate.
- Allow approximately 5-10 seconds for the chip to transmit data to the vehicle’s ECU.
- Start the vehicle.
Following installation, the chip initiates a learning process, gathering data from the vehicle’s computer and transmitting overrides to the ECU. This process can take up to two weeks of normal driving to fully complete and optimize performance and fuel economy. Another installation guide suggests simply plugging the chip in while the vehicle is running and allowing 150 accumulated miles for the remapping process.
Reported Performance Improvements
Users have reported several potential benefits from using the JDM PROM Performance Chip. These include:
- Increased horsepower (up to 50% according to the manufacturer)
- Improved torque, particularly at low engine speeds
- Enhanced throttle response
- Smoother gear changes
- Increased fuel economy (approximately 2 MPG reported in one test)
- Improved idle stability
- Enhanced towing power
- Better passing ability
One review noted a “definite improvement in throttle response and pick up power and extra torque” after a week of driving with the chip installed. The same review also observed smoother engine handling. Stage 3 Performance Chips for Chevrolet vehicles claim up to 40HP increase, 38.2 ft·lbs added torque, and up to a 50% improvement in throttle response.
Compatibility and Operational Considerations
The JDM PROM Performance Chip is designed to work with a wide range of engines, including:
- Regular gas engines (stock)
- Turbocharged engines
- Supercharged engines
- Hybrid engines
- Turbodiesel engines
- Diesel engines
It is also compatible with both manual and automatic transmissions. The chip is designed to operate safely and efficiently in all weather conditions and with various engine modifications. The manufacturer states that the chip will not interfere with the vehicle’s factory warranty.
It is recommended to use higher octane fuel for optimal gains, although the chip is reported to function with all fuel grades. The chip must remain plugged into the OBD2 port to operate. Indicator lights on the chip display software function but do not require monitoring. To revert the vehicle to its original settings, simply unplug the chip with the engine off; the vehicle will return to its factory tune the next time it is started.
Manufacturer Response and Verification
A performance chip review group contacted JDM Performance with questions regarding the legitimacy of their product and requested proof of performance enhancements. The company reportedly provided a prompt and detailed response with references supporting their claims. This response contributed to the reviewer’s conclusion that the JDM PROM Performance Chip “Works!”
Stage 3 Performance Chip Details
The Stage 3 Performance Chip, specifically for Chevrolet vehicles, features an upgraded multi-core CPU and is advertised as 100% safe and plug-and-play with zero cutting required. It boasts features such as high-speed CAN data inputs (500 times per second), fine-tuning of air/fuel ratios, and the ability to eliminate flat spots or throttle response issues. It also comes with a lifetime warranty and a 100% money-back satisfaction guarantee.
Conclusion
The JDM PROM Performance Chip presents itself as a straightforward method for enhancing vehicle performance. Installation is reported to be simple, and the chip is designed to be compatible with a wide range of vehicles and engine types. While performance gains vary, reported improvements include increased horsepower, torque, fuel economy, and throttle response. The manufacturer’s responsiveness to inquiries and the chip’s technical specifications, including its use of a Microchip PIC18F4580 microcontroller and support for multiple OBD protocols, suggest a more sophisticated design than some competing products. However, the extent of performance improvements may vary depending on the vehicle and driving conditions.