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Updated: May 6

Are these a good idea?

Well in our opinion, this is a hard no! But there is more to consider. When it comes to remapping or re-flashing a car's engine control unit (ECU), there are several differences and potential hazards when using a remote tool compared to professional services at a tuning shop with a hub, roller or road dyno and or associated safety equipment.


While some of these remote tuning devices may set you back $1000-$1500, a professional dyno tune may be even cheaper. So why take the risk with your pride and joy, buying something online, far from support?

Customisation and Precision:

Professional Dyno Tuning: 

Professional tuning on a dyno allows for real-time monitoring and adjustment of engine parameters under controlled conditions. The tuner can make precise adjustments based on the actual performance of the car as it runs, accounting for specific factors like fuel quality, altitude, modifications and unique engine characteristics.

Tuners can observe and adjust for safety margins, ensuring that the engine operates within safe parameters. They can detect potential issues before they become serious problems, preventing engine damage.

Mobile tuning:

Lets not get this confused with remote remapping modules. There are many tuners that re-flash a vehicle remotely with a dedicated tuning laptop computer, and files from their master tuner, or may even be a master tuner themselves. The professional ones (not back yard cowboys that bought an ebay/alibaba tool from China) will monitor all safety conditions of the vehicle, measure the air fuel ratios with a wide band oxygen sensor attached to the exhaust to ensure safe and efficient tuning and provide feedback to their master for minor tweaks and modifications. This is by far a much safer alternative, provided the technician is a highly experienced mechanic, a tuner himself and has a good relationship with his/her master tuner.

Remote Remapping Tool: 

Remote tools typically use pre-made maps that might not be perfectly suited for your specific vehicle. These maps are based on generic engine types and expected conditions, which might not perfectly align with your car's unique aspects or your driving environment.

To emphasise, using a generic map might push certain aspects of your engine beyond safe limits without adequate real-time testing and feedback, which can lead to increased wear or failure.

Hazards of Using Remote Remapping Tools:

Engine Damage:

Not all tune files are created equal. The vehicle may have the same engine, transmission as the tune calibration file has been designed for in the remote remapper. However, the vehicle may have a slightly different software version which will respond differently when the maps are changed and loaded into the ECU.

These Improperly calibrated maps can lead to engine knock, excessive turbo pressure, or improper air/fuel ratios, all of which can damage the engine. This is where a professional tuner can modify these maps to perfect the parameters to suit.

A map not tailored to your car's specific needs and environment might result in sub-optimal performance, increased fuel consumption, or unreliable engine behavior.

Potential for Incorrect Installation:

The process of flashing or installing the new software remotely carries the risk of errors, such as incomplete installation or incorrect firmware, which can lead to major drivability issues or even a non-starting vehicle.

In summary, while remote re-flashing tools provide a convenient and cost-effective alternative to professional tuning, they lack the customisation and safety of a dyno-tuned approach. It's crucial to consider these factors and potentially consult with a professional to minimise risks and ensure the longevity and performance of your vehicle.


Maintaining the correct battery voltage is crucial during the process of remapping or reflashing a vehicle's ECU using a remote remapping tool.

Here are some of the key hazards associated with battery voltage during this procedure:

Loss of Connection or corrupted data:

If the battery voltage drops too low during the remapping process, it can lead to a loss of connection between the remapping tool and the ECU. This can interrupt the flash process, leaving the ECU in a corrupted state where it might not function properly or at all, essentially "bricking" the ECU.

A professional tuner will stabilise the battery at 12-12.5v for the flashing process. Some vehicles may have the engine fans run during the reflash process which can drain the battery very quickly.

Stable and adequate voltage is necessary to ensure that data is written correctly to the ECU. Fluctuations in voltage can result in corrupted data being written, which can lead to software anomalies, incorrect engine tuning, and potentially harmful engine settings.

Preventive Measures:

To mitigate these risks, here are some precautions and steps that can be taken:

1. Use a Battery stabiliser: Employ a stabiliser or maintainer during the remapping process. This ensures the battery remains at a constant optimal voltage (12-12.5v) reducing the risk of voltage drops and interruptions. Re-flashing outside of these voltages can cause irriversable damage to your ECU.

2. Check Battery Health: Before starting the remapping process, check the condition of the vehicle’s battery to ensure it is capable of maintaining stable voltage throughout the process. Tighten any loose connections. If you have a battery tester, its a good idea to complete a load test also.

3. Vehicle Preparation: Turn off unnecessary electrical loads (e.g., headlights, HVAC system, radio) during the remapping to minimise the drain on the battery.

4. Monitor Voltage: If possible, monitor the battery voltage during the remapping process to ensure it stays within a safe range, typically around 12 to 13 volts, depending on the vehicle.

5. Monitor engine parameters or have a professional mechanic do this. You ideally need a professional level scan tool, a wide-band oxygen sensor, a manual boost gauge measuring from the charged air system (not boost seen on a scan tool) and knock detection equipment.

By following these guidelines, you can significantly reduce the risks associated with battery voltage issues during ECU remapping with a remote tool, ensuring a smoother and safer modification process.


The information provided is for informational purposes only and does not constitute professional advice.

Remote remapping tools carry risks, including potential engine damage and drivability issues.

Maintaining correct battery voltage is crucial during the remapping process to prevent data corruption.

Users are advised to consult with qualified professionals and take necessary precautions before proceeding with any ECU remapping.

We disclaim any liability for damages or losses resulting from the use of remote remapping tools or reliance on the information provided.

For safe and reliable ECU modifications, seek professional guidance and adhere to best practices.

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