JUST AUTOS DISTRIBUTOR

Toyota Diesel Performance Specialists

Your Just Autos distributor for Toyota diesel tuning and performance upgrades. From ECU tuning to supporting hardware, Hunter Mechanical handles supply, fitting and tuning in-house, with packages tailored to towing, touring and everyday driving.

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BUILD YOUR PACKAGE WITH JUST AUTOS

You’ll be redirected to Just Autos to build your package. This tool is for planning only. Compatibility, performance and suitability require review and confirmation by Just Autos.

Build Your Package

ECU REMAP & MULTI-MAPPING

Experience the ultimate software evolution for your Toyota. Go beyond a standard single-file tune with an industry-leading multi-map system that lets you seamlessly adapt your engine's power, throttle response, and safety parameters to match any driving condition.

Toyota 300 Series ECU REMAP

Watch a real-world towing test showcasing active converter lockup in manual mode, advanced closed-loop EGT protection, built-in flashing engine light alerts, and on-the-fly pedal sensitivity adjustment.

Multi-Mapping

See how simple it is to cycle through your 6 custom engine profiles—from a stealth immobilizer mode to hard-working tow maps—using either your factory cruise control stalk or a sleek physical dash dial.

The Software Revolution: Introducing Version 4 Multi-Mapping

The market's most advanced software: six custom maps, exclusive "Easy Pedal" throttle control, multi-layer temp protection, and built-in gear blipping inside your factory ECU.

packages explained

Package One

See how Just Autos Package 1 delivers a reliable 30% power bump and smooth driving using smart factory controls.

Package Two

Watch how Package 2 brings heavy-duty underbody protection and an aluminum airbox to your weekend adventures.

Package Three

Check out the ultimate 4-inch exhaust and snorkel upgrade that builds the ultimate nationwide touring machine.

Package One

Watch us wake up the sluggish factory V8 with a massive jump to 230HP and a heavy-duty 1600Nm clutch.

Package Two

See how an upgraded aluminum airbox and heavy-duty dual fan kit keep your V8 intake temperatures ice-cold under load.

Package Three

Look inside the ultimate build featuring a genuine Garrett JA300 turbo upgrade designed for relentless towing and off-road power.

Package One

Watch how our advanced 6-map ECU system gives you custom throttle response and built-in engine safety parameters.

Package Two

See what happens when you combine our precision multimapping with a custom high-flow airbox and a TIG-welded 4-inch stainless exhaust.

Package One

Discover how matching a custom engine tune with an advanced automatic transmission remap gives you a 4-fold increase in drivability.

Package Two

See how adding a premium Manta exhaust system to our custom software unlocks up to 80% more usable torque.

Package Three

Watch us clear up common factory V8 fueling issues and maximize engine output using high-flow performance injectors.

Package One - N80

Give your N80 Gen 3 the muscle it needs with a proven remap package built for the sand and the street.

Package One - N70

Wake up your reliable 3.0L D-4D with a dramatic torque upgrade that makes standard driving ancient history.

The Best in the West

Bringing Australia’s premier Toyota diesel performance tuning directly to Western Australia. See how our strategic partnership combines world-class research and development with local expertise to build vehicles capable of conquering the toughest WA heat, towing, and touring conditions.

Behind the Scenes: Just Autos Visits Hunter Mechanical in WA

Watch Matt from Just Autos touch down in Western Australia to tour our pristine workshops in Kenwick and Rockingham, collaborate on precision mainline hub dyno tuning, and advance our ongoing dealer training program.

Engineered for the West

Discover why we chose Just Autos as our exclusive tuning partner to deliver performance and reliability. Learn why premium heat management, product R&D, and stocked inventory are vital for heavy towing in WA.

GALLERY

79 Series GVM Upgrade Build

FAQ

FREQUENTLY ASKED QUESTIONS

Why does the quote button take me to the Just Autos website?

All Just Autos quotes go through their official form, so you get the right package and pricing for your vehicle. Just Autos will then put you in touch with your closest authorised distributor. In WA, that’s Hunter Mechanical.

Can you fit it at the same time as my GVM upgrade?

Yes. Once Just Autos has sent your quote through, let us know you’d like the GVM or other work done at the same visit, and we’ll plan it all together.

What gains can I expect?

That depends on your model, the hardware fitted and how the vehicle is set up. Just Autos will outline what to expect for your vehicle in your quote.

What about my warranty?

Just Autos has a warranty program for its products; the details are in your quote and on their Warranty Info page. If your Toyota is still under its new-car warranty, talk to us before booking so you understand your options.

When is the right time to tune?

The best time is when you’re adding weight or planning to tow, for example a GVM upgrade, bar, drawers or a camper. Fitting it at the same visit means one booking and a setup planned around the whole build.

Do I need bigger injectors?

Not always. Larger injectors are part of some higher-output Just Autos packages, depending on what you want from the vehicle. Your Just Autos quote will say whether they suit yours.

200 Series: lock-up kit or transmission remap?

Both change how the auto gearbox locks up the torque converter, which matters when you’re towing or carrying weight. Which one suits depends on your setup. Just Autos will recommend the right option in your quote, and we’ll fit it.

Can’t Find Exactly What You’re Looking For?

If you are ready to plan your upgrade or have specific questions about a package, contact our shop today. For any additional information or nationwide network details, visit the main Just Autos website.

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