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Ford Transit - TDI Remap | TDI Tuning

TDI - Turbocharged Direct Injection


Turbocharged direct injection or TDI is a design of turbo diesel engines featuring turbocharging and cylinder-direct fuel injection that was developed and produced by the Transit Group (VW AG).These TDI engines are widely used in all mainstream Transit Group marques of passenger cars and light commercial vehicles made by the company (particularly those sold in Europe). They are also used as marine engines in Transit Marine and Transit Industrial Motor applications.

The TDI engine uses direct injection, where a fuel injector sprays atomized fuel directly into the main combustion chamber of each cylinder, rather than the pre-combustion chamber prevalent in older diesels which used indirect injection. The engine also uses forced induction by way of a turbocharger to increase the amount of air which is able to enter the engine cylinders, and most TDI engines also feature an intercooler to lower the temperature (and therefore increase the density) of the 'charged', or compressed air from the turbo, thereby increasing the amount of fuel that can be injected and combusted.

These, in mixture, allow for better engine efficiency, and therefore greater power outputs (from a more whole combustion process compared to indirect injection), while also decreasing emissions and providing more torque than the non-turbo and non-direct injection petrol engine complement from VAG.

What is TDI Engine
Best in the industry

What is TDI Remap
Better throttle response


When a manufacturer develops a new car they have to take into thought all of the conditions it may be subjected to in all of the areas in which they intend to sell this model. This means instead of just optimizing the ECU’s program or ‘map’ to deliver the best performance or the most fuel efficiency they have to make negotiations to the map to take into account these potential differing operating conditions.

Ford Transit TDI Remap from Quantum Tuning can completely transform your TDI engine and revolutionize your own driving experience. The introduction of modular engines and the huge leap forward in electronic control has meant that a TDI remap can exploit the potential in your engine whilst staying within factory tolerances. Manufacturers use this same technique to vary the output of engines that they provide you with to save on costs and maximize profits.


Unlike other methods of diesel engine, the Transit TDI offers a lot of boost to the engine. This helps it to reflect the speed and fast gear changes of a gasoline car, although diesel will still hold in the same gear for a while. There have been more developments in the TDI recently, with the creation of an exhaust gas recirculation unit, which attempts to reduce the pollution produced by gasoline still further. The installation of catalytic converters also helps to decrease even the small amount of CO2 which the ordinary diesel car produces.

  • Increased horsepower
  • improve fuel economy
  • TDI Remap maintain reliability
  • TDI Remap will ensure NO DPF problems
  • provide smoother power delivery
  • provide safer over taking ability


The fuels required for TDI engines include diesel fuel (also known as petro diesel), depending on emissions equipment, location dependent. TDI Remap with Tuning will not only increase the power of your engine it will also provide you with great gains in fuel economy. The key to fuel economy is fuel pressure and torque delivery which is how modern diesel engines are achieving such impressive figures. Transit TDI Remap optimizes fuel pressure points and torque delivery to ensure that under general driving conditions you will see a nice improvement in fuel economy.


Fuel wants oxygen to burn and the engine has to be complete with huge quantities of air to get enough. You can solve this problem with a better engine or you can solve it with a turbocharger as in the TDI. Driven by the exhaust gases, it squeezes air more tightly into the cylinders.

After being drawn through the turbocharger the air is then cooled by fleeting it through an air to air intercooler (cool air takes up less space than hot air), before inflowing the combustion chamber where diesel is inserted in a straight line into the cylinders at very high pressure through a nozzle. It’s this intensive mixing of highly atomized fuel with the cooled compressed air that leads to better, more efficient combustion.

Your driving information is quiet and refined because effective sound insulation keeps noise to a minimum, while hydraulic engine mounts ensure smooth, low-vibration running.

How TDI Engine works
Safer overtaking

Saving Fuel with TDI Remap
10%+ fuel saving on diesel engines


When we remap a vehicle, particularly increase economy with fuel saving is the priority we focus on improving the low end torque in particular and widening the power-band as far as we can.

This increase in low end torque will mean less throttle pedal input is required to maintain cruising speeds, when fully loaded or when on a slant. It will also mean that the vehicle will be easier in advanced mechanisms at slower speeds as well requiring fewer gear changes overall.

If you combine these factors with regulating your driving style to make the most of the extra low end torque you will see an improvement in fuel consumption. This is most real on turbo-diesel engines where the savings could be as much as 20%.


We do not change any hardware in your vehicle, we just modify the operating parameters in the ECU’s program or ‘map’. In many cases the map stored on the ECU’s processor can be read via the on-board diagnostics port (OBD) in the vehicle, normally found under the dashboard. In some newer models the ECU will have to be removed from the vehicle and the casing opened, our technicians will then use expert tools to read the original map straight from the processing chip.

The trained will then upload the original map to our map writing team who will adjust the parameters to maximize the performance, fuel economy or a clever blend of both. Liable on the vehicle and ECU type the remapping process can take under an age and if at any time you request to return your vehicles ECU to its unique default settings, this can be done easily and free of charge as we always keep a copy of the original software as a backup.

What do you actually modify
Increased torque – up to 35%


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