4JJ3 Performance ECU & TCU Remapping | Mail-Order Bench Tune
Suits: All Isuzu D-MAX, MU-X & Mazda BT-50 (4JJ3 3.0L Models)

Stop settling for factory lag and indecisive shifting. Our mail-order bench tuning service is designed specifically for the Australian 4JJ3 platform. By recalibrating the factory PCM and TCU, we transform your vehicle into a more powerful, efficient, and capable machine—whether you're hitting the tracks, towing the van, or a tradie with a heavily loaded tray full of tools pulling work trailers around all day.

The Results (Proven on our Dyno)
Our real-world testing shows exactly what our Stage 1 calibration can do for your 3.0L 4JJ3:

• 33% Power Increase: Jump from a stock ~93kW up to a massive 124kW+ at the wheels.
• Torque on Demand: We flatten and raise the torque curve, giving you effortless pulling power from down low—essential for getting a heavy trailer moving.
• Refined Driveability: Smoother throttle response and power delivery across the entire rev range.

Transmission Tuning Options (TCU)
We offer two distinct transmission calibrations to fix the factory "gear hunting" and improve power delivery:

• Stage 1 Trans Tune: * Recommended for: Daily drivers, light towing, and vehicles with standard or light tray loads.Features: Revised shift points and a refined Torque Converter Lock-up mapping for a more connected, responsive drive.

• Stage 2 Trans Tune (Heavy Duty): Recommended for: Tradies with heavily loaded trays, tools, and constant work trailer duties, or high-GVW touring setups.Features: Increased line pressure and a more aggressive Torque Converter Lock-up strategy specifically designed to handle sustained high engine loads and reduce slip.

Requirement: STAGE 2 TCU TUNE MUST be paired with an external transmission oil cooler

Link: Purchase our Dual External Transmission Oil Cooler Kit here

Tune Options
Select your package from the dropdown menu:

• PCM Only (Engine Remap): Focused on maximum engine power and torque.
• TCU Only (Transmission Tune): Fixes shift logic and TCC lock-up (Available in Stage 1 or Stage 2).
• PCM & TCU Combo: The ultimate package. Both units are tuned to work in perfect harmony. (Highly Recommended).

DIY Friendly: 5-Minute Removal
You don't need a mechanic to get this done. Both the PCM and TCU are located behind the glove box.

• Accessing them is simple and only takes about 5 minutes with basic hand tools.
• Simply unclip the glove box, unplug the harnesses, and slide the units out of their brackets.

Same-Day "Back on the Road" Guarantee
We know your truck is your livelihood—if it’s not moving, you’re not earning. All mail-order tuning is treated as High Priority.

• Same-Day Turnaround: We tune and dispatch your units the same day they arrive at our store.
• Bench-Tuned Excellence: Professional calibration performed safely on our tuning bench—no vehicle required.

 How to Order (Shipping Instructions)
To ensure the fastest possible return, please follow these steps:

1. Remove your PCM and/or TCU. Pack them securely in a padded box or bubble wrap.
2. Order your specific tune variation online.
3. Ship the units to us via an Express method.
4. Include a Pre-Paid Express Return Satchel/Label: This is required for our same-day turnaround. We will use your provided label/bag to send the units back the moment they are finished.