Summary

Would you recommend going richer on air fuel ratio for boosted applications like an Evo 8? Yeah that's a really good point there. So we have obviously done our lesson here on a naturally aspirated engine. 

00:00 - Neridan has asked, would you recommend going richer on air fuel ratio for boosted applications like an Evo 8? Yeah that's a really good point there.
00:08 So we have obviously done our lesson here on a naturally aspirated engine.
00:13 And if we are tuning a turbo charged engine then yes we will be tuning with a richer air fuel ratio target when we are in the boosted areas of the map at wide open throttle.
00:24 And the reason for this is simply because with a turbo charged engine we are combusting more fuel and air inside the combustion chamber.
00:31 And remember one of the aspects with the additional fuel that we're adding is to help cool and control that combustion chamber temperature.
00:38 So all things being equal, if we're creating more heat, we're going to potentially want to richen the air fuel ratio to help combat that.
00:46 So it's not uncommon for a naturally aspirated engine to run somewhere in the region of 13:1 like we've seen already.
00:53 With a turbo charged engine, depending on the boost pressure we're running, we might be more likely to see air fuel ratios in the range of 11.5:1 maybe through to 12:1 That question was taken from one of our free live lessons.
01:07 If you like free stuff and you're the type of guy who wants to expand your knowledge, click the link in the description to claim your free spot to our next live lesson.
01:16 You'll learn about performance engine building and EFI tuning, and you'll also have the chance to ask your own questions which I'll be answering live.
01:25 Remember it's 100% free, so follow the link to claim your spot.