Isuzu & Mazda 4JJ3 3.0L Diesel ECU Tuning
How Much Power Can the Shared 4JJ3 Engine Gain?
4JJ3-TCX 3.0L Turbo Diesel
Our 4JJ3 tuning program delivers real, measurable results — validated on our in-house dyno. The 4JJ3 3.0L turbo diesel is shared across the Isuzu D-MAX RG, MU-X, and the Mazda BT-50 TF. Despite wearing different badges, they share the same proven engine architecture — meaning our calibrations are well-proven across hundreds of vehicles.
The 4JJ3 responds extremely well to remapping, with strong gains in mid-range torque that transform everyday driveability and towing capability. We account for vehicle-specific factors during the tuning process to deliver strong, reliable results regardless of whether you drive an Isuzu or a Mazda.
Dyno Results — Eco Package Remap
Isuzu D-MAX / MU-X / Mazda BT-50 4JJ3 — Measured at the wheels
Results from a healthy, stock automatic 4JJ3 with DPF fitted and Eco Package ECU remap only. Individual results may vary.
Dyno Results — Power Package Remap
Isuzu D-MAX / MU-X / Mazda BT-50 4JJ3 — Measured at the wheels
Results from a healthy automatic 4JJ3 with turbo back exhaust and Power Package ECU remap. Individual results may vary.
99
Stock kW
138
Power (kW)
640
Torque (Nm)
Packages
Eco Package
ECU Remap
$1,590
Power Package
ECU Remap
$1,590
Towing Package
Tow-Tuned Remap
$1,890
Performance Package
ECU Remap + Intercooler + Exhaust
$3,500
Additional Performance Upgrades
No upgrades available for this vehicle.
One Engine, Three Vehicles.
The 4JJ3 3.0L turbo diesel is shared across the Isuzu D-MAX RG, MU-X, and the Mazda BT-50 TF. This cross-manufacturer engine sharing means our tuning expertise directly applies whether you drive an Isuzu or a Mazda — the engine under the bonnet is fundamentally the same.
At Stealth Installs we have deep experience with the 4JJ3 across all three vehicles. Since the engine is fundamentally the same across all platforms, tuning results and performance gains are consistent. We account for vehicle-specific factors like weight and gearing during the tuning process to deliver strong, reliable results.
Engine Specifications
Engine
3.0L 4-Cyl Turbo Diesel (4JJ3-TCX)
Stock Power
140 kW @ 3,600 rpm
Stock Torque
450 Nm @ 2,000 rpm
Found In
Isuzu D-MAX RG, MU-X, Mazda BT-50 TF
What We Do for Your 4JJ3
Proven modifications for the 4JJ3 platform across Isuzu and Mazda vehicles.
ECU Remapping
The 4JJ3 responds extremely well to remapping, with strong gains in mid-range torque that transform everyday driveability and towing capability. Since this engine is shared across Isuzu and Mazda, our calibrations are well-proven across hundreds of vehicles with identical architecture.
Intercooler Upgrades
The 4JJ3 benefits from intercooler upgrades, especially in South Australian heat and under sustained towing loads. Keeping intake temperatures under control is critical for consistent performance and engine longevity.
Exhaust Systems
A free-flowing 3" stainless exhaust removes backpressure from the turbo system, helping spool response and allowing the engine to extract more from the tune. Off-road DPF options available.
Catch Can Systems
The 4JJ3 produces blow-by that contaminates the intake over time. A quality catch can is essential preventative maintenance for long-term engine health.
Suspension & Lift
Suspension setups for work, towing, or off-road adventures across all three vehicles. We set your vehicle up to handle accessories, loads, and camper trailers without compromising ride quality.
Accessory Installations
Bull bars, trays, drawer systems, auxiliary lighting, dual battery, canopies — we build complete work and touring vehicles ready for Australian conditions.
Common Questions
Keen to Talk About Your 4JJ3?
Give us a call — whether it's a D-MAX, MU-X or BT-50, come in for a coffee and we'll have a relaxed chat about what's possible.