How do I choose the "Right" Air-Fuel Ratio?

[@themotoroilgeek]

THIS is the channel every motor head has been waiting for! Real teaching from someone that actually does the work!

[@EFIU_Ben]

More to come!

[@syedali1299]

Thank you, Lake Speed Jr. You're awesome. This channel is great. I subscribed it

[@PiyushKulkarniixuspk]

But his voice is irritating

[@EFIU_Ben]

Sorry! LoL It's the only one I've got!

[@NonyaNonya-zf1nb]

If you're only listening to his voice, you're NOT paying attention to the content.

[@deancrawford2577]

As I'm doing more and more emission tunes, we learn something new all the time, camshafts, vvts, inlet manifolds, combustion chamber shape, compression ratio etc can really change the way an engine utilizes fuel combustion....

[@crasher88]

everything effects everything else. there are so many factors and it always boils down to give and take. gain in one area equals a loss in another

[@EFIU_Ben]

Ageed! The variables keep it interestingfor sure!

[@ivaninsa2355]

Nice to see new content after 1 year. Hope to see more.

[@EFIU_Ben]

More to come!

[@wheresmy10mm]

Please continue these videos. Absolutely priceless information and well formatted and entertaining.

[@EFIU_Ben]

More to come!

[@petehalasz7547]

Great video and explanation.. I've been a licensed technician for over 45 years.. worked on just about everything.. now I teach.. always looking for a different way to explain.. very nice.. love the BTU angle...

[@fredastaire6156]

OMG...?!?!? Dude, who are you and where did you come from?! This content is incredible; actual science, no bro tuning trash, or misinformation to sift through. Seriously, I'm sold...where is the course on tuning my 4 cylinder Subaru? I want to learn how to do this myself! 😍

[@EFIU_Ben]

Wow, thanks! Best feedback I've had so far!

[@jeromeallisonii8253]

WOW!?!? I thought air-fuel ratio was gonna be a lot different to understand but now you made it a lot easier to get thanks you❤

[@EFIU_Ben]

@@jeromeallisonii8253 That's great! Thanks!

[@robinhoode9364]

Great content. Thanks for sharing

[@EFIU_Ben]

Thanks for watching!

[@bill2178]

i love the math formulas and the science behind engine management as greg banish says the best guys are not the ones with secrets but the guys following the science

[@EFIU_Ben]

Greg is a smart guy!

[@c.a.r.s.carsandrelevantspecs]

Very interesting and professionally done video! Thank you so much for this content! ⚙⚙

[@EFIU_Ben]

Our pleasure!

[@leobardomuro1667]

Keep up the good work on these videos learning a lot from you.looking forward to watching and learning more

[@EFIU_Ben]

Lots more on the way!

[@joshuamcgirr6638]

More Videos like this one!! 👏🏼👏🏼

[@brianb5779]

Great video

[@RileyPowersports]

This is an HP Academy level course for free on the internet. Well done!

[@martinrodger9565]

Really well presented. Thank you for sharing your experience and the information behind it.

[@EFIU_Ben]

Glad you liked it

[@notsponsored103]

This was a super helpful lesson. Thank you Ben. I feel like I should have been paying for it.

[@EFIU_Ben]

Glad it was helpful!

[@nepicness]

Fantastic vid, about to install a ls with a cam in an 94 ford. Probably don’t need a masters in fuel ratios/tuning, but this is great for getting the framework down to understand why I’m doing what I’m doing

[@EFIU_Ben]

glad it helps!

[@autonomous_collective]

No link for Download! Ben, add link for download talked about.

[@ivaninsa2355]

This is the best explanation one could have on what AFR yo choose.

[@FilterYT]

That was amazing. Thank you! small mistake including the "per minute" in BTU

[@EFIU_Ben]

Good call! Thanks for finding that! -Ben

[@powerst33r]

Assuming that we are going for reliability first: Given that the AFR for maximum power is probably 12.5~13.5:1, richer mixtures are more for cooling and reliability. Could we use water injection for forced induction engines instead of richer mixture to achieve the same cooling effects? Is it possible to work out how much water we need to inject? Would something like EGT be a good gauge to tell whether our thermal management is in the safe window? Another thing to consider is, would it be beneficial to run the coolant at a lower temp like 80°C instead of 90°C to help in thermal management? How do we arrive at what temp to run? My 4 stroke car engines are usually around 95°C, but my 125cc 2T race kart engines runs coolant at 55°C How about using colder spark plugs? How do we quantify how much is safe or still unsafe?

[@EFIU_Ben]

That's a lot of great questions! I'd love to do a whole video on all this.

[@powerst33r]

@@EFIU_Ben Thanks Ben, I really look forward to the video

[@davidmatthiesen6876]

That was a really interesting report

[@sardengineering]

Pure Gold!

[@NonyaNonya-zf1nb]

If you enjoy his videos, you'll be amazed by his class. It's an exceptional opportunity to elevate your skills and take your high-performance career to the next level.

[@EFIU_Ben]

Thanks so much!

[@johnchartrand5910]

Interesting, though we never see this real testing on either engine dyno or wheel dyno. We see a much smaller window of air fuel ratios no matter the application. At 11:1 n/a engines simply won't make anywhere near their potential and over 13.5:1 the same. Typical ranges we see are 12.3 to 13.1 on the extreme ends. Of course, type of fuels, compression, combustion chamber efficiency, and on and on dictate where the engine runs best, and the dyno absolutely is a great tool to get this in the right area.

[@angelamartim8337]

I've got a question please. If a richer mixture is used to keep the temps down, then why more fuel is used right after cold starts? Shouldn't it be the other way around for cold starts?

[@EFIU_Ben]

Great question! So, only the vaporized fuel will burn, and it takes warmer temps to convert from liquid to vapor, so when the engine is cold, it requires more total fuel volume to be supplied so that enough of it will convert to vapor in order to get the engine up and running and keep it running so that it can generate some heat to warm up…as the engine temps come up, the extra fuel isn’t required so no need to waste it by continuing to add extra!

[@HPFarm]

Ben got a question, @ 15:39 ish you say using more fuel to make same power at WOT, but then state BSFC went down. Shouldn't it go up? 150 #/hr / 300 HP = 0.5 vs 200 #/hr / 300 HP = .6

[@EFIU_Ben]

Sorry…what I meant was the level of efficiency for BSFC “has gone down” meaning it’s not as good…. I see how my choice of words could have been misleading there making it seem like I meant “got smaller” which wasn’t my intended meaning. Thanks for the catch!

[@Mintonperformance]

Naca reports, back when we could 'trust the science' 😊 , hope all is well -Mitch

[@sardengineering]

This is fantastic information, great insight into what attendees can expect from the online courses from the EFI University. The course this video was taken from has been around for almost 10 years, and it’s still extremely relevant. Thank you Mr Strader 🫡

[@sardengineering]

Cheers Mitch, been ages since I last said hello. Hope you are well mate.

[@EFIU_Ben]

Hahah Thanks Mitch! Hope you're good too!

[@Alex_Bket]

Thanks !!! We need more video

[@EFIU_Ben]

More to come!

[@joshuagibson2520]

The ole banana in the tailpipe. Lol. If you know, ya know.

[@erickbren8702]

dude, very interesting and all. But can you just tune my LS1?

[@shadowsinner1356]

Good info to know

[@EFIU_Ben]

Glad it was helpful!

[@Offiallilwatta]

Keep these type of videos consistent, so people could have somewhere to come and learn something new and have a steady location to look forward to 💯

[@EFIU_Ben]

We definitely plan to! THANKS!

[@JakeSmith-m2m]

I know this isn’t related to the topic you made the video of but what is the main thing you would do if you owned a 04 f350 6.0

[@Bacongrease00]

Become a good diesel mechanic with a piggy bank

[@Grâce-n1d4x]

Would be nice if Metric equivalents is included to cater for the rest of the world.

[@EFIU_Ben]

Technically, there are no metric numbers...there is only Lambda which is about "chemistry" and A/F Ratio which is about "quantity" Hope that helps

[@Grâce-n1d4x]

@ “Horsepower, Gallons, Feet, etc. You know what I mean?

[@angelamartim8337]

4:27 5:24 6:29 7:11 8:36 10:31 14:04

[@MET90LX]

Wow. I usually just choose my target AFR based on what my plugs look like. (Drag racing) cut the threads and look at the ring on the base of the porcelain. And for timing. Well if the strap is gone. Pull a degree and try again. If the strap is still there add a half a degree. Lmao

[@EFIU_Ben]

LoL That works too

[@nesmio7378]

It's 2024 - you ought to produce videos in 4K but the bare absolute minimum is 1080p - or the compromise - 1440p. 720p is 20 years outdated by now and feels weird to watch ;) Great video apart from that, hope to see more in the style and fashion of this one!

[@bitzer8722]

I refreshed because I thought there was a bug. Turns out it literally is just 720p. That was pretty disappointing. Even most phones are higher pixel count that 720p, kinda unacceptable. 1080p is bare minimum.

[@EFIU_Ben]

Well said! I made that video in 2015! LoL So, yeah I agree...better stuff coming your way!

[@nesmio7378]

@@EFIU_Ben Understandable, lol. But 720p was already outdated in 2015 - you been slacking for a while Ben ;) Better make up with crisp 4K for the videos coming up!

[@EFIU_Ben]

@@nesmio7378 New video dropped today! Take a look and see if I've delivered the goods now? LoL Thanks for the education! -Ben

[@joshuagibson2520]

Get a damn grip on yourselves. This gentleman is providing you with excellent scientific info. FOR FREE. Anything above 480 is just fine. Especially in a video with no scenery and minimal graphics. Have some grace.

[@ComputerCapone]

Ben, your a great mind. You need to take a position in the market like Gale Banks. Open a shop open for contracts. You have the equipment and mind. Rest is history?

[@EFIU_Ben]

I wouldn't mind that one bit! Thanks!

[@ComputerCapone]

@EFIU_Ben lots of tax breaks...just saying.

[@ozgur_butu]

2:08 Naca report 189?

[@EFIU_Ben]

You can google that and download it from several sources!

[@Nudnik1]

Ok

[@Offiallilwatta]

Try and make videos when your physically working on tunes or the engine in general, this is gonna make people more interested in cars and what’s under the hood and how it works

[@EFIU_Ben]

That's a great suggestion! Thanks

[@damarwirawan1348]

Oh gawd.... This lecture makes me sick as I realised how much energy lost while consuming limited energy 🤦

[@EFIU_Ben]

Its bad, isn't it? haha

[@ClaudioLorenzoRaia]

Great stuff. What a pity all units are imperial when almost the entire world uses metric and has to do conversions. Maybe it could be a good idea to list both units.

[@kenjohnson3412]

A interesting and helpful video that would be much better without the annoying and unnecessary background music.

[@notsponsored103]

I was so focused on Ben I didn't even hear it

[@nepicness]

Music might’ve been a pinch loud, but overall I didn’t notice it

[@petehalasz7547]

If you focused on the music then you weren't paying attention.. no one heard the music..

[@chrisstavro4698]

I truly respect what you do, but there are so many erroneous statements, implicit assumptions, and bad logic in this video. It's good to be familiar with prior art, but you need to work with best practices. Materials, sensors, computing power, and our collective understanding have come a LONG way in 103 years! There are plenty of PhD who don't understand what goes on inside the black box.