The Isuzu D-Max, known for its durability and utility, also offers considerable potential for performance enhancements through tuning. This article explores the possibilities of tuning the D-Max, particularly focusing on the power outputs for its 4JJ1 and 4JJ3 engines.

Is Tuning Possible for the Isuzu D-Max?

Tuning the Isuzu D-Max is indeed feasible and can be highly effective. The process typically involves adjustments to the engine’s electronic control unit (ECU), optimizing various parameters like fuel injection timing and turbo boost pressure. These modifications can improve power, efficiency, and responsiveness.

Expected Power Gains from Tuning a D-Max

After tuning, the Isuzu D-Max can experience significant increases in both horsepower and torque. Depending on the quality of the tune and the specific engine variant, owners can expect an increase of approximately 20-30% in power. This improvement enhances not only acceleration but also the vehicle’s capability to handle heavy loads and challenging driving conditions.

4jj3 Dmax On the dyno. Yes they can be tuned
4jj3 Dyno Graph

Power Enhancements for the 4JJ1 Engine

The 4JJ1 engine, a common choice in older D-Max models, can benefit greatly from tuning. With proper adjustments, this engine can see power increases that make the vehicle more capable in towing and off-roading scenarios. Typical enhancements can push engine output by up to 20%, improving both peak power and torque across a broad rpm range.

Tuning the 4JJ3 Engine

Introduced in newer models of the D-Max, the 4JJ3 engine represents the latest in Isuzu’s engine technology. Tuning this engine can lead to even greater gains in power due to its more modern design and enhanced adaptability to ECU remapping. Increases in power output and torque are similar to those achievable with the 4JJ1, ensuring that the vehicle performs optimally under various conditions.

For those interested in unlocking the full potential of their D-Max, considering a Dmax remap can be a valuable step. This not only boosts performance but also ensures that the vehicle maintains high efficiency and reliability.


Tuning the 2020 Isuzu D-Max offers significant benefits in terms of power and performance. Whether you’re aiming to improve daily drivability or enhance the vehicle’s capability for specific tasks like towing, a professional tune can provide the necessary upgrades to meet your needs.