TDI Tuning | How & why tuning boxes work

How & why tuning boxes work

Section tuning-why description

How we release your hidden power

Your engine is producing 20-40% less power than it is naturally capable of. Almost all manufacturers develop one engine and limit it electronically to comply with worldwide regulations, fuel grades, climate etc.

This means your engine has much more to offer in terms of power and economy.

TDI Tuning has been developing pioneering solutions to this issue for over 10 years.

Our tuning boxes release this natural power and are designed to be used by the every-day driver, offering incredible gains with zero risk to your vehicle.

Section tuning-why configuration

Example engine

Section tuning-why overview

Technology overview

How does it work?

The tuning box takes live data from various engine sensors and delivers optimised signals to the ECU, making the engine perform as it should.

Where does it go?

The tuning box simply plugs into the engine with a durable connector. Installation depends on your vehicle’s engine type but typically plugs into the fuel and turbo sensors.

Is it bad for my engine?

A TDI Tuning tuning box does not make any permanent modifications to your vehicle- it simply tells your engine to run as it should without pushing past its limits. Removing the tuning box will return your vehicle back to its original condition.

Are they complicated to install?

The tuning boxes are designed to be plug-and-play and can be installed at home with no mechanical knowledge needed. Installation takes around 15 minutes and illustrated instructions for your vehicle are included.

The TDI Tuning CRTD4 tuning box

Section tuning-why driver

Tuning for the
everyday driver


Unlock the potential of your engine. Our tuning boxes release up to 40% extra horsepower and torque. The CRTD4 also increases fuel economy by up to 20% typically delivering an extra 4-6 MPG.


You can be sure that your TDI Tuning tuning box understands your engine. Every tuning box is engineered by our expert technicians to work seamlessly with your vehicle.


TDI Tuning tuning boxes do not modify the engine’s ECU in any way. This means the tuning box leaves no trace on the vehicle’s electronic brain and, once removed, returns the vehicle back to its original condition.

Easy install

TDI Tuning tuning boxes are simply plug-and-play. They require no specialist knowledge or tools and installation takes around 15 minutes.


Your tuning tuning box can be used on future vehicles using a low cost reprogramme service, with a 7 working day turnaround.


Our products connect with your engine via the fuel and turbo sensors, ensuring your ECU is always in control and no damage can come to your engine.

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TDI Tuning App

Smartphone displaying the TDI Tuning app, shown with TDI Tuning CRTD4 tuning box

More power or more economy? With the TDI Tuning App you can decide directly from your driver’s seat. Instantly change the performance of your engine and adapt your vehicle to suit any situation.

Download the app from the App Store or Google Play Store:

App Store
Google Play Store

Section tuning-why cta-finder

Find your
tuning box