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Diesel Tuning Fundamentals


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Learning how to tune diesel engines has been notoriously difficult. The diesel tuning industry is unique as there’s no formal qualification path you can take that will make you a recognised diesel tuner. This makes it hard if you’ve got an interest in diesel tuning and want to learn more. It also means that many of those tuners out there in the industry right now don’t have a proper understanding of what they’re doing and the results are predictable - Poor engine performance, terrible driveability, and of course, needlessly damaged engines.

Modern diesel engines already offer impressive power and torque in many instances straight off the show room floor, but it’s what these engines can deliver with some basic modifications to the factory tuning that is really exciting. It’s not uncommon to see improvements in power and torque of more than 25% without even making any mechanical changes. Like any engine though, unlocking the potential from a diesel engine while ensuring the engine remains reliable requires in depth knowledge of the principles behind diesel operation, as well as how the tuning parameters affect the engine.

The Diesel Tuning Fundamentals teaches you the core principles behind the operation of a common rail diesel engine. You’ll learn how the diesel engine operates, how the combustion process occurs, and how engine torque is controlled by the fuel delivery. You’ll learn how a modern common rail diesel fuel system works and in particular how the fuel pressure affects the engine’s performance. You’ll learn about injection timing and see how this affects both performance and emissions. With emissions becoming increasingly important, you’ll also learn about the emissions from a diesel engine and see how these emissions can be dealt with, both with hardware such as EGR systems and Diesel Particulate Filters, as well as how the Nox emissions and exhaust smoke are affected by our tuning changes. You’ll also learn about pilot injection events and see how these can be used to reduce that knocking sound that diesel engines are so well known for. In each instance you’ll also see the concepts being demonstrated in real time on our dyno to really reinforce the topics being taught.

This course isn’t specific to any particular engine or any particular ECU. Instead it focuses on the core principles that are applicable to any engine and ECU. Understanding these will allow you to apply your knowledge regardless what type of diesel engine you’re personally interested in. So regardless whether you’re reflashing the factory fitted ECU in your Ford powerstroke or GM Duramax, or you’ve fitted an aftermarket diesel ECU to your Toyota Hilux, this course will be perfect for you.

What you will learn
  • Differences between petrol and diesel tuning
  • What AFR to target in diesel engines
  • Diesel emissions EGR and DPF
  • How to control boost
  • Why diesels smoke and how to limit it
  • Injection timing and operation
  • About diesel rattle and how to reduce it

Common Questions

Do I get a certificate?

Yes, we provide a digital certificate of completion with every course you complete. This is great for the workshop wall or CV.

Can I watch the course videos whenever suits me?

You can access your course material via our website, 24 hours a day, 7 days a week, 365 days a year.

Where is this course located?

This is an online course. You can learn wherever and whenever you like. You don't need to travel, and you don't need to work to the tutors pace, instead you can start, stop and reference any topic you want to as you see fit.

Do I need any prior knowledge of diesel tuning before taking this course?

No! This course assumes you know nothing about diesel tuning and starts from the basics before moving into more advanced concepts and demonstrations.

Does this course teach you how to tune HEUI systems?

No, this course does not apply to hydraulically controlled applications like Fords HEUI system.

Does the payment plan cost me extra?

No! The payment plan just splits the total price for absolutely no extra fees or charges. If you miss a payment, you can even pick up where you left off as life happens, sometimes finances go wrong, and we won't punish you for it, we're here to help you learn instead first and foremost.

How long do I have to watch the course videos?

Once purchased you have LIFETIME access to your training course/s. Lots of our customers use these course videos are reference material throughout their careers.

Does this course apply to gasoline engine tuning?

No, this course is specific to performance diesel tuning. For gasoline tuning you should start with the EFI Tuning Fundamentals course.

Does this apply to mechanical injection applications?

No. While the theory is the same, the way you apply it is very different between common rail diesel applications vs mechanical systems.

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