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Installation - Tunit Diesel Performance Tuning
(852) 2648 6000 | INFO@TUNIT.HK
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The Tunit is supplied with  Original Manufacturers Connections to allow simple installation and removal. Professional installation can be  carried out worldwide by our network of Agents and Installers who provide a Try before you Buy with a full test drive.. Tunit is not invasive of original equipment in the same way chip tuning, car remapping or any other type of engine map so it can be removed when changing vehicles. Self installation is achievable for almost any customer with a few tools. Full  instructions and support is provided by phone and email from 9am to 9pm.

Choose find a fitting centre for your local Tunit Agent.


Remove the vehicle engine cover

Allow your engine to cool and then remove the cover if it has one.

Original plug is unplugged

Find the location of the plug using the instructions provided. Disconnect the original plug and connect the Tunit harness.

Secure Harness and Tunit

Secure the Harness and Tunit in place using the adhesive strips and cable ties, refit the engine cover and close your bonnet.


Test drive and enjoy the performance and fuel economy improvement.



Each engine and vehicle has different characteristics and it is important to be able to alter the power delivery and economy for each. As an example several vehicles produced on the same day and production line will drive and perform differently. The Tunit will compensate for any power variance your vehicle already has and also provide on average 12% better fuel economy.

Adjustment Method

The Tunit is pre-programmed but if you wish to adjust your tunit then you can choose between 9 settings to improve power and economy further.

Laptop Tuning

The Tunit can be altered further by your installer for bespoke purposes such as Heavy Towing, Acceleration or Economy.