CRTD4 Marine Diesel Tuning Box
CRTD4 Marine Tuning Box Kit
CRTD4 Marine Tuning Box Harness

CRTD4 Marine Diesel Tuning Box Chip

Cummins QSB 5.9-480

+ Add Ons
Performance Gains
Power Increase:
Torque Increase:
Fuel Efficiency Increase: Up To 20%
Product Information

Cutting Edge Marine Tuning Technology

The CRTD4® Marine Diesel Tuning Box from TDI-Tuning for the Cummins QSB 5.9-480 473 BHP / 480 PS / 353 KW / 1278 NM / 943 LBFT  is at the cutting edge of digital tuning box technology for marine engines and represents a revolution in engine performance remapping. Powered by an 80 MHz ARM microprocessor, the CRTD4 remaps engine output moment to moment based on data received via the engine sensor interface harness. The engine fuelling profile of the vehicle is then remapped to improve power and torque delivery creating smoother and more responsive performance.


Boost Engine Performance Safely

For Marine vehicles the CRTD4® Marine Diesel Tuning Box is a versatile engine tuning solution. For larger engine vessels the increases in power and torque will ensure that even under the most trying weather conditions the engine(s) will be able to produce the torque needed to maintain smooth sailing. For smaller crafts our tuning solution can be switched between 7 modes, from least to greatest performance gains, allowing you to find the optimum engine output combination for your leisure boat.

Improved Fuel Efficiency:
The TDI-Tuning box can improve fuel efficiency by up to 20%. This fuel efficiency improvement is down to your own individual driving style.
5 Year Product Warranty:
The TDI-Tuning Box comes with a 5-year product warranty. This is a fully comprehensive product warranty. If anything goes wrong with your TDI-Tuning Box, we will fix it or replace it free of charge.
Traceless Removal:
The TDI-Tuning Box is traceless once removed from the vehicle. It does not leave a digital or physical trace behind. This is because the tuning box adjusts your engine sensor readings before the ECU (Electronic Control Unit). Please ensure you remove your tuning box before inspection.
The TDI-Tuning Box can be reprogrammed as many times as you want! So long as we can tune your vehicle, you can reprogram our tuning box. Double check with our team to ensure we can tune your next vehicle.
Engine Safe:
Our Tuning Box is completely safe to use. All of our tunes are rigorously tried and tested before being released to our customers.
Simple Install:
Our Tuning Box requires no previous mechanical ability and can be installed within 30 minutes. It requires no physical alterations to be made to the engine or to the vehicle software. As each tuning box comes with its own set of specific instructions, it’s very easy to install!

The UK’s leading tuning box just got better! Now with Bluetooth capabilities the CRTD4 tuning box brings the benefits of tuning to your fingertips.

Now you can control the performance of your engine from the comfort of your driver’s seat with the TDI Tuning App. Connect to your tuning box and enjoy total control, transforming your driving experience.

  • Power

    Turn the tuning box on/off using the TDI-Tuning Mobile app. With a touch of a button you can turn your TDI-Tuning Box on, harnessing the full power capabilities of your engine. Or, you can turn it off, reverting the vehicle to stock.

  • Adjust

    With the TDI-Tuning App adjusting the power output is easy. Simply connect your phone to the TDI-Tuning Box and toggle between the 7 power modes at your disposal. Mode 1 offers the least amount of power, and, is commonly used for fuel saving reasons. Mode 7 is the biggest power increase you have on offer, use it for maximum power!

  • Warm Up Timer
    Warm-Up Timer

    The TDI-Tuning Box comes built in with a 30 second warm up timer. This means the map file will not begin to run until 30 seconds after your engine is turned on. This is to protect your engine, primarily for cold engine starts. If you would like to increase, or decrease this map timer, you can adjust it using the TDI-Tuning App.

  • Discreet Mode
    Discreet Mode

    Activate ‘Discreet Mode’ on the mobile app to turn off the LED lights on the TDI-Tuning Box. All lights will be turned off, putting the tuning box into ‘Discreet Mode’. You can use this mode if you are trying to conceal the tuning box from casual inspection in the engine bay.

  • Connect

    Connect with other tuners throughout the world on our social networks. Contact our team directly through the app using one of our social media or web chat channels.

* Tuning profile is representative.

Cummins QSB 5.9-480 473BHP / 1278NM
+ Add Ons
£559.00 £447.19


TDI Tuning digital tuning boxes come pre-programmed for your engine - you just plug it in, secure it with the supplied cable ties and drive off to enjoy an immediate and significant increase in performance.

Tuning boxes come complete with fitting instructions, TDI Tuning also have step-by-step fitting videos available for many of our most popular vehicles.

If you need an expert to help you with your fitting then a TDI Tuning engineer is only a phone call away.

We offer a free installation service at our HQ in Chelmsford, Essex. TDI Tuning also have a network of partner garages across the UK. For a small fee TDI Tuning can organise installation at your local fitter.