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Fuel trim problem indication

EFI Tuning Fundamentals

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Discussion and questions related to the course EFI Tuning Fundamentals

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Hi guys,

I found a guy on YouTube claiming that fuel trims up to 20% is acceptable and actually stated that one of his references is High performance Academy!

I never came across such thing in any of the videos.

What would be an acceptable % and what not?

Also do you combine both short and long term?

Thanks George

yes George you combine both of them as Andrew told us . An acceptable % in my opinion and as far as i remember would be [+-] 5%

Thank you for your response.

I always was allowing a maximum 10% combined.

Sounds like the limit should be lowered a bit..

Thanks again

You are welcome my friend. Don’t be afraid it’s not a big deal to decrease it . In a magic world the perfect would be 0% but it is very difficult to achieve so a 5% [+-] is ok

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