Isuzu D-MAX & MU-X 4JJ1 3.0L Diesel Tuning
What Performance Gains Can You Expect from the 4JJ1?
4JJ1-TCX 3.0L Turbo Diesel
Our D-MAX and MU-X 4JJ1 tuning program delivers real, measurable results — validated on our partnership-accessed 4WD dyno, essential for the MU-X's full-time AWD drivetrain. The 4JJ1 3.0L is a proven, robust engine that responds well to remapping with strong gains in mid-range torque.
Isuzu left significant power and torque on the table with the factory calibration. A quality remap transforms everyday driveability and towing capability while maintaining the reliability these vehicles are famous for.
Dyno Results — Eco Package Remap
Isuzu D-MAX / MU-X 4JJ1 — Measured at the wheels
Results from a healthy, stock automatic 4JJ1 with DPF fitted and Eco Package ECU remap only. Individual results may vary.
Dyno Results — Power Package Remap
Isuzu D-MAX / MU-X 4JJ1 — Measured at the wheels
Results from a healthy automatic 4JJ1 with turbo back exhaust and Power Package ECU remap. Individual results may vary.
85
Stock kW
120
Power (kW)
512
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
The Proven Workhorse.
The Isuzu D-MAX and MU-X with the 4JJ1 3.0L turbo diesel are fixtures on Australian roads — honest, reliable vehicles built to work. The 4JJ1 is a well-proven engine with solid tuning potential that the factory calibration doesn't fully exploit.
At Stealth Installs we've tuned countless 4JJ1 vehicles at our Salisbury workshop. Whether you're running a work ute or a family 4WD, we know exactly what the 4JJ1 needs and how to unlock its potential reliably.
Engine Specifications
Engine
3.0L 4-Cyl Turbo Diesel (4JJ1-TCX)
Stock Power
130 kW @ 3,600 rpm
Stock Torque
430 Nm @ 2,000 rpm
Found In
D-MAX RT, MU-X (Pre-2020)
What We Do for Your D-MAX or MU-X
Proven modifications for the 4JJ1 platform.
ECU Remapping
The 4JJ1 responds well to remapping, with strong gains in mid-range torque that transform everyday driveability and towing capability. We carry proven calibrations specific to the 4JJ1.
Intercooler Upgrades
The 4JJ1 benefits from intercooler upgrades, especially in South Australian heat. 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 4JJ1 produces blow-by that contaminates the intake over time. A quality catch can is one of the best maintenance investments you can make for a D-MAX or MU-X.
Suspension & Lift
D-MAX and MU-X suspension setups for work, towing, or off-road adventures. 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 D-MAX and MU-X work and touring vehicles ready for Australian conditions.
Common Questions
Keen to Talk About Your D-MAX or MU-X?
Give us a call — come in for a coffee and a chat. No pressure, just good conversation about your vehicle.