Air/Fuel Ratio
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Joined: Apr 2007
Posts: 59
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From: Port Byron IL
Air/Fuel Ratio
I have a 92 LT1. Is there any way to understand what the air/fuel ratio is by monitoring the volt readings on the oxygen sensors? I am trying to do a little tuning before I can hook it up on a wide band.
Le Mans Master
Joined: Feb 2005
Posts: 5,146
Likes: 3
From: The Motor City
scans and datamaster and the like only show the target afr. MV in c.l. moves over the crossover too much to equate that to a constant afr.
Usually when tuning for C.L., trying to achieve a 128 ish blm would be considered safe, and might (depending on origin of tune, what's done in the tables etc in the tune, overall state of car, blower, na, really to many variables here to list.) be reasonablly close to 14.7.
I have noticed after runnig the wide band in PE, that certain mv. readings can than be ralated to an already known afr. I wouldn't want to tell someone a certain mv. is 'safe' in their car/set up, as that may not be true in someone elses car. Thei only accuarate method is to use a WB.
Race Director
Joined: Apr 2003
Posts: 17,700
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From: moraga ca
I have an Accel DfI fuel management system on my Corvette. Before I got my wide band, I would record the 02 sensor voltage at wide open throttle in open loop. In closed loop, the reading varies all over the place so it was not helpful to monitor the voltage. In open loop, .730 was my target and would equate to approx 12.5 afr on the wide band. Caution though, 02 sensors are different and what worked for me may or may not work for you. Willie
