Wideband reading help

[JoEgsX90]

I was wondering if anybody can give me a direction on just basic reading of a wideband. i have the aem uego wideband that was just installed and looking to see what should i look for, whats rich whats lean, what should i be at at idle and while driving??... My profile tells you what i have installed. Baicly 6-bolt block, 7bolt head, 16g turbo, 190 fuel pump rewired and STOCK injectors for now untill winter is over. Also have safc2 all zeroed out

 

[viperlp01]

14.7 in perfect but you might be a little leaner/ higher number. The higher the number the leaner you are. The way a wideband works is it reads how many oxygen molecules are to one fuel molecule. Soo the higher you go the more oxygen/less fuel is in the reading.

Wide open throttle- around 10

 

[notched306]

mid 14's at cruising and idel and high 11's at wot.10's are way rich

 

[No_Skillz]

Everyone needs to clarify their posts to avoid misinformation. This stuff is important and could result in blown motors if you keep throwing in random wrong info.

14.7 is a stoichiometric reading, meaning air/fuel mixture is at an ideal burn ratio. Since "ideal" does not meal "reality," this reading is usually only seen when the motor is on very low loads - idle and cruise.

Many people go for 11.8 or maybe a bit higher on race gas.

On pump gas I personally tune for 11.0 and make sure there is no knock.

On a stock setup, your reading can range anywhere from 9.0-10.5. It is very rich, but there is nothing wrong with this. Factory tune is extremely conservative. However, this reading is also not very accurate, since any wideband has trouble with detecting a/f ratios when you stray too far from 14.7. This is why it's very important to do a proper BLT to ensure that you aren't running retardly rich where components can be damaged (clogged cat, fouled spark plugs, rich knock). Stock tune will run rich but won't damage anything if the car is properly maintained.

A/F reading is ratio of Air:Fuel, so higher means more air/lean. Lower means less air/rich.

Keep in mind that you need to have a leak-free exhaust system to ensure an accurate reading. If you have a leak, you will read substantially leaner.

 

[JoEgsX90]

Yea my idle is at at 12.9 around there. So thats to rich right????

 

[matthewdesigns]

Yes, that's a little rich. You can use the safc to lean the mix out a bit in the LO settings for idle/cruise. The HI settings are for WOT tuning, which is where you want the tune to be rich, as mentioned above.

 

[JoEgsX90]

Ok so if i wanted to adjust it to around 14 at idle, how would i go about it on my safc2 under low throttle plus or negative?

 

[black92_tsi_awd]

I run 12.5:1 on race gas 112 with 21 degrees of timing and 11.5 on pump. Keep a close eye on knock or timing retard(2g).

At idle and cruising you should see the WB cycling between 14.2-15.5 Basically the average should be 14.7

 

[matthewdesigns]

Ok so if i wanted to adjust it to around 14 at idle, how would i go about it on my safc2 under low throttle plus or negative?

Negative. That tricks the ECU into thinking that less air is coming in, so less fuel is added. Less fuel + the same amount of air (since you are tricking the ECU) = leaner. Just watch your wbo2 gauge and you'll see the numbers rise as you pull air from the signal with the afc.