Diesel Performance

Dyno tuning is the process of optimising your vehicle’s performance using a chassis dynamometer (dyno). Your diesel vehicle is run on a 4WD dyno to measure real-time power (kilowatts) and torque (newton-metres). Our technicians then fine-tune parameters like fuel delivery, air intake, and ignition timing to improve performance. This process involves repeated testing and adjustment until optimal results are achieved.

Yes. Dyno tuning a diesel vehicle typically results in a 15–20% increase in horsepower and torque, depending on the vehicle and its current condition. Even greater gains are possible when combined with other performance upgrades such as upgraded intercoolers, exhaust systems, or turbochargers.

United Fuel Injection can dyno tune most light diesel vehicles, including 4WDs, utes, and SUVs. This includes both:

• Common rail diesel engines, which we tune via ECU remapping
• Mechanically injected diesel engines, which we tune manually on the dyno using traditional mechanical adjustments

ECU remapping is the process of accessing and modifying the software inside your vehicle’s Engine Control Unit (ECU). The ECU controls vital systems such as fuel delivery, boost pressure, torque limits, and emission controls. By editing the existing “map,” we can optimise your vehicle’s performance to better suit your driving style, towing needs, or existing modifications.

At United Fuel Injection, the remapping process begins with a diagnostic dyno run to assess the vehicle’s performance and identify any issues, such as lag off idle, flat spots, or inconsistent fueling. Once we confirm the vehicle is healthy, we access the ECU and make custom adjustments to:

• Torque limiters
• Fuel injection timing and duration
• Boost and rail pressure
• Emissions controls
• Air-fuel ratio
• Throttle response

We then test the results on our 4WD dyno to verify gains and ensure smooth, reliable performance.

We can remap most modern common rail diesel vehicles from popular brands including:

• Toyota (LandCruiser, Hilux, Prado)
• Ford (Ranger, Everest)
• Nissan (Patrol, Navara)
• Isuzu (D-MAX, MU-X)
• Mazda (BT-50)
• Volkswagen (Amarok)
• Jeep, Holden, Mitsubishi, and more
• European brands such as Mercedes-Benz and BMW (common rail turbo diesel models only)

Remapping your diesel ECU offers a range of performance and drivability improvements, including:

• 15–20% more power and torque
• Improved fuel efficiency
• Better throttle response
• Stronger towing capacity
• Smoother acceleration
• Elimination of flat spots in the power curve, particularly off idle

These benefits are especially noticeable in loaded or towing conditions and off-road driving.

When done professionally with proper diagnostics and dyno testing—as we do at United Fuel Injection—ECU remapping is safe and reliable. We customise each remap to stay within the mechanical limits of your engine and driveline components.

Yes, ECU remapping can improve fuel economy—especially in diesel engines. By optimising fuel injection timing and air-fuel ratios, many vehicles see a 5–15% fuel efficiency improvement, particularly under load or while towing.

Yes. All ECU remaps done at United Fuel Injection are fully reversible. We keep a backup of your factory map and can restore your vehicle to stock settings at any time.

Most dyno tuning and ECU remapping jobs are completed within half a day, depending on the vehicle and the level of customisation required. We recommend booking in advance.

It potentially can, depending on your vehicle manufacturer’s warranty policy. Some dealerships may void parts of the warranty if they detect an ECU remap, especially for components related to the engine or drivetrain. For this reason, many owners choose to wait until their factory warranty has expired before going ahead with a remap.

If your vehicle is still under warranty, we recommend checking directly with your dealership to understand how ECU remapping might affect your specific coverage.