Monte GTR Support

Check the catalogue: make, model, year and engine. Monte GTR works on cars with an OBD-II port — in the US from 1996, in Europe from 2001 — but each engine needs its own setting, so not every car is listed yet. Browse supported cars →

It tunes the engine through the OBD-II port and puts everything on its own touch screen: seven modes, live gauges, a scan tool for fault codes, a 0–60 timer and a virtual dyno. The factory ECU software is left as it is.

It depends on the engine. Up to 20% on turbocharged engines, up to 12% on naturally aspirated ones and up to 10% on hybrids — measured against the combined output of engine and battery, because a tune works on the combustion engine only. Real-world results may be less or more: engine size, fuel quality, altitude, engine condition and how the car is driven all play a part.

The Economy modes are made for steady, relaxed driving. How much fuel they save depends on the car and how it’s driven — we don’t quote a figure until we’ve measured it.

Race, Race Plus and Race Max are for dynamic driving, with Race Max giving the most performance. Sport and Sport Plus are a mix: some more power, some fuel saved. Economy and Economy Plus are for fuel efficiency, with no loss of power. Each mode has its own profile and its own adjustment. The tuning switch on the screen puts the car back on its factory settings.

A mode is live as soon as you select it, and the GTR refines it over roughly 120 miles (200 km) of normal driving — the ADJ percentage on the home screen shows how far it has got. Progress is saved when you switch the engine off and carries on next time, ten miles or a hundred at a time. Switch to another mode and its own adjustment begins.

Yes, if you chose your exact car when you ordered: it arrives ready to plug in. If you did not, write your car to it yourself: sign in to your Monte account with the order email, open GTR Programmer in Chrome, Edge or Opera on a computer, connect the GTR with a micro-USB data cable, then choose make, model, year and engine and write it. No computer at hand? Tell us and we will program it for you.

Yes. Write the new car to it in GTR Programmer in your Monte account (in the browser on a computer) — or tell us and we will do it — then plug it in and let the mode run its 120 miles. Selling the car? Take the GTR with you.

Tell us the make, model, year and engine. We build the file for your car, normally within three business days.

Live gauges: a fixed dial with coolant temperature, rpm, speed and battery voltage, plus four cells you fill yourself — boost, fuel pressure, throttle angle and more. The screen can only show what your car’s ECU reports, so some readings may be missing on some cars.

Yes. The scan tool reads the fault codes your car has stored and clears them. Clearing removes the record, not the cause: if the fault is still there, the code comes back.

The timer starts by itself when you pull away and stops at the target speed. The dyno measures power and torque as you pull through the revs in second gear, from the engine data your car reports; runs are saved and can be laid over each other. It is made for comparing runs, not for certified figures. Run tests only on a closed track, never on public roads.

The factory ECU software is left as it is, and the factory safeguards stay active. Like any tune, the performance modes add load — use them as intended, and keep the fuel grade and service schedule your manufacturer specifies.

No — installing an aftermarket part doesn’t void your car’s warranty by itself; that’s US federal law (the Magnuson-Moss Warranty Act). Monte doesn’t rewrite the factory software, and unplugging it puts the car back on its factory settings. Warranty repairs are always the dealer’s decision.

The factory software was never changed, so the car is back on its factory settings. The same happens if you switch tuning off on the screen.

It stays plugged in — that is how it keeps tuning and showing data. Parked, it goes to sleep and wakes when you start the car. If it does not sleep or wake properly on your car, change the wake-up setting to ECU or VOLT; plug-in hybrids use Hybrid.

Stick the suction mount on the windshield where it does not block your view. With the ignition off, push the 16-pin end of the cable into the OBD-II socket under the dash on the driver’s side, plug the RJ45 end into the back of the GTR and start the car. Use the port on its own — never through a splitter.

Yes. Monte GTR works with gasoline and diesel engines, including turbo-diesels, and with many hybrids. Check your exact engine in the catalogue before you buy. Browse supported cars →

Yes. The GTR tunes the engine and nothing in the gearbox, so it works with manual, automatic, dual-clutch (DSG) and CVT transmissions alike.

Yes. A throttle controller only changes how the pedal is read; Monte GTR tunes the engine itself. They work on different systems, so they can be used together.

No. Use the fuel grade your manufacturer specifies. Higher octane may help a little in the performance modes, but it is not required.

Both tune the engine. Monte GT is set from the Monte app on your phone. Monte GTR has its own touch screen with live gauges, a scan tool, a 0–60 timer and a virtual dyno. If you only want the tune, GT. If you want to see what the car is doing, GTR.

Unplug the GTR. If the light stays, it is the car, and it wants looking at either way. If it goes out, write to us with the serial number (type bigSn in Settings → Advanced), your car and a photo of the screen.

No. Monte tunes the engine and switches between its own modes — nothing else. It doesn’t remove the top-speed limiter, doesn’t turn off stability control, traction control, ABS or other safety systems, and doesn’t change lighting, tire size or speedometer calibration.