Lambda VS AFR - Jay's Tech Tips

Do you understand what the display on your Wideband AFR Gauge is telling you? does it get confusing when you switch back and forth between E85 and Gasoline? This week's tech tips will help simplify things for you.

[WyGuyTurbski]

personally, I love these videos! I find them very interesting even though I'm familiar with most of the content. keep em coming!

[rbsrobertball]

Thanks Jay, you explained this in manner that anyone could understand and you did it without being condescending.

[bighoff]

This is exactly what a newby who has a turbo car needs to hear. Thank you so much. You are the real mvp

[ChasingPerfection]

I enjoy these videos as Jay knows his shit. Anytime a professional takes time to explain things, you sit and listen. Whether we are familiar with the topic or not. Can usually gain some bit of knowledge.

[AlexErnst]

Thanks for making clear that the sensor itself will report the same output level as Stoich no matter the fuel. Few commentators nor WB sensor sellers make that clear and that leads to confusion about AFR calculated by the gauge head unit and its indirect relationship to tuning math. Lambda and 1/Lambda (or Phi) makes table correction super simple.
Case in point that using AFR is routinely misleading, is that most gas these days is E10 (and getting worse, thanks EPA renewable fuels mandate) and therefore more like 14.1:1 at stoich. But your will still get 14.7 on your good ol AFR calculating gauge when your fuel system has trimmed up the mix to E10's stoich.

[xZENxSAMURAIx]

These video's are excellent. So awesome to get a different perspective on things even though you may already be familiar with the topic being reviewed. Thanks for the information TRC/ Jay!

[LBC_squared]

Wow... Just cleared up my whole misunderstanding with afr gauges and different fuel types. Thanks!

[strikeforce]

Honestly the info you gave just gave is from experience. Its worth more then just about any book can explain.

[GingerNingerGames]

Now I understand why motec doesn't ask what fuel you're using. It runs lambda for o2. This is good knowledge.

[john-martin]

the question is if Brian Spilner would have known this would he still have lost his floor board

[GTguy]

that was a good video, and is extremely helpful to someone wanting to learn more about wideband gauges. thanks for sharing TRC.

[NaiyimsGarage]

Thank you, Just understood AFR - LAMBDA .... so confused for me, now is clear THK Subscribed and liked already

[lykav]

Jay, this is one of the best explanations out there for EUGO gauge reading! But if I may, can you confirm @1:25 the stoich ratio you have for E10 pump gasoline? Because I believe E10 is 14.1:1, due to the up-to-10% ethanol component of the fuel. Straight gasoline (E0) stoich should be 14.7:1. Other than that, this video rocks. Keep up the good work!

[ladams]

That explains the difference perfectly with not one bit uncovered great job

[JRS]

Great video, really helped me understand my gauge better all together

[btmnt]

Love the Tech Tips! Great work and perfect explanaitions. Even on the subjects that I have good knowledge, I feel that I learned a lot. Good Job!

[BigSupes]

Love Jay's Tech Tips. Thanks for the info - keep 'em coming!

[king.dannyman]

1 = perfect mixture
095 - 1.05 = Cruising
0.75 - 0.80 = boost
0.85 - 0.91 = N/A

[Grainsauce]

One thing to add to the Stoichiometric Values, 14.7:1 is for normal gas without ethanol, nearly all pumps put up to 10% so Stoich for most fuels is actually 14 to 14.1

[BulliKid]

So if I add a gallon of e85 to a tank of 93, am I still targeting 14.7 low and 12.5 high load?