Trucker82

Hello, can someone help me decipher between Lambda/Wideband/O2- Hego readings. At WOT my Hego reads .925-.9 Wideband reads 11.5-11. Now with that said, Lambda is 14.xx =1 right? So is Lambda the same reading on my Wideband? or a different calculation?

Also, is there a conversion for Hego to Wideband?

Also, witch way is rich or lean on the Hego reading?

What is to rich or lean on wideband?

Thank you for the help, obviously Im a rookie, yes I have been reading tons, and yes I would also love links to good reading for tuning, and no I hate trolls so dont talk garbage unless u want it back.

LQ4 in a silverado 1500 twin turbo Tuned by Latemodel Throttle, And I am wanting to do a cam change to a Comp Thumper Cam from a mild street cam. Want to go with duration 275 In 295 ex 108 lob separation .560 lift. current cam 265/265 .530 lift 115 lobe separation.

Thank you Sincerely

JoeNova

A Hego is typically a narrowband type sensor. When you say .925-.9, are you talking lamda, or volts? With a Hego, the farther from stoic, the less accurate they become. There is no conversion from Hego to lambda/wideband because the readings aren't linear and they are only accurate to within a very narrow range of stoic.

Trucker82

okay well thank you. volts I believe, from the scan guage I have mounted right next to the wideband. So lambda is only for setting tables in a tune? Is there a known detonation point on the wideband for an LS1? And as far as the 02 reading, can you help me understand what I am looking at for volts? in other words, how do I put the measurement from the sensor into a useable or meaningful format to know what it is saying? Also, what is the reaxing telling the PCM?

JoeNova

The chart explains your volts. If you're seeing .9 volts, you are running richer than 14:1. Unfortunately, no matter how much more rich it gets, the volts will not change.

Narrowbands are good for letting the PCM adjust its own fuel trims. They are NOT good for doing your own tuning and you should ignore them for the most part.

Get a wideband.

Trucker82

okay good to know then. i have a wideband. i reads 11.5-11 at WOT throughout a hard pull. can you help me with the rage of rich /lean and where that reding is?

JoeNova

Quick google search will explain rich and lean. A higher number than 14.7:1 is lean, a lower number is rich. N/A engines make max power in the 12.5-13:1 range. If you're reading 11:1, its way too rich and you're giving up power.

HCI2000SS

iTrader: (2)

I just installed my wideband the other day, and found out that mine is at 12.0. I thought that was a tad rich for n/a, but my tuner assures me thats exactly where it should be for my setup. Who am I to argue lol. This afr is on the street and not the dyno. On the dyno im told it would be even richer

Trucker82

Thanks JoeNova! though I have a Twin Turbo setup. I listed that at the original post. anyways, Im trying find out if turbo charged moves that number around? or is it a number that means the same no matter what? And what do other serious LS1 tuners aim for?

JoeNova

Mid 11s AFR is about right for a twin turbo setup. Anything leaner than 11.8:1 in boost is pushing it a little.

Trucker82

okay thank you. so stupid question.....going into the 12's under 8lbs boost is leaner right? 10's would be richer?

Trucker82

okay so its starting to sink in now. but now im more confused. under hard loax the O2 reeads 14:1AFR, but my wideband which is 7 inches from the 02 sensor reads 11. Is the wideband reading on the same scale as the O2? the WB says 11, does that mean 11:1 AFR?

Ues I feel like a DIp S.... all on my own, so take it easy on me. And thank you!