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Understanding AFR


Why are our online courses better than a physical workshop? (Other than being a fraction of the price.)

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Taking this course will give you a solid understanding of how and where to set the air fuel ratio when tuning any engine. A key aspect to choosing the correct AFR is understanding that every engine is different and you can’t approach each tuning job with the same air fuel ratio targets. This course will explain how the air fuel ratio effects combustion, economy and emissions, and in turn how this effects our tuning requirements. You will learn about the different areas of engine operation and how the fuel requirements of the engine vary as load and rpm change. Most importantly though, you will learn a simple four-step approach to deciding on the correct air fuel ratio for your engine. These steps include:

  1. Analysing the operating specifics of your engine
  2. Defining a starting target AFR map
  3. Tuning the engine
  4. Evaluating changes in AFR

At the end of this course you will have the confidence to choose the correct air fuel ratio for any engine and any application, ensuring maximum performance and reliability.

What you will learn
  • What AFR (Air Fuel Ratio) and Lambda mean
  • How the AFR requirements change with load and rpm
  • How the AFR requirements vary for different fuels
  • How to find the correct AFR for your particular engine
  • How AFR effects power
  • How AFR effects the knock

Common Questions

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.

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.

Is motorcycle engine tuning covered in this course?

Yes! This course applies to all 4 stroke petrol EFI engines. That includes motorcycle tuning, or even if your engine is in a boat or a plane!

Can I watch the same video more than once?

Of course, lifetime access means you can watch every module just 1, or even 1000 times. It's up to you how and when you learn and then reference your course material.

What happens if I have questions or need help?

You can get answers to your questions in our members only forum. Our tutors answer questions very regularly and are dedicated to your success.

Does this AFR course apply rotary engine tuning?

Yes! While you will target different AFRs or Lambda values in many different applications, the principles of how they work and what the values mean is the same regardless. If you are tuning a rotary engine, you will get value from this course or your money back, we promise.

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.

What skill level is this course aimed at?

This course starts right at the beginning making it ideal for beginners with no experience what so ever. It also provides great information at a more intermediate level for those who have already had some experience.

Is this course applicable to Diesel Tuning?

No, this course is not applicable to diesel tuning. If you want to learn to tune diesel engines you will need to check the Diesel Tuning Fundamentals course.

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.

Does this apply to turbo or supercharged engines?

Yes! 100%! The same fundamental principles apply to naturally aspirated, or forced induction (turbo and supercharged etc) engines. Things just happen a lot faster in the latter!

Will this AFR course apply to carburettor tuning?

Yes sir! The fundamentals of AFR are the same regardless if you are using EFI or a carb. The application of how to reach your target AFRs however is different when ti comes to carb tuning, so the practical demonstrations we show won't apply to carb tuning, but the knowledge around AFRs will.

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