Racepak O2 sensor
Have added a single O2 sensor to a racepak sportmans unit.
It is mounted on the collector just after merge. Running a BBC on C12. I know location is not the prime Spot. I am only taking values above 6000 for comparison since The sensor is in the collector. The "lowest" reading I very see is 13.8 and that is only in High gear at higher rpm What values should I see and does the motor load effect The AF value. The 13.8 is lean correct? But plugs look Ok. Haven't tried bigger jets let but will soon now tracks are Opening up Thanks David |
Re: Racepak O2 sensor
13.8 is rich by around one point. Perfecto is 14.7.
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18:1 works for mileage but sucks for power, if you can keep the fire lit. :rolleyes: https://x-engineer.org/wp-content/up...io-300x296.jpg |
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https://x-engineer.org/automotive-en...e-performance/ |
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My plots look backward compare to what everybody
Is explaining The first plot was in 3500' air and the second Was 300' air. No changes in the car at all. The graph index for A/F is 10 to 15 at the top of the graph The first plot has a 12.8 reading at top of 1-2 gear change The second plot has a reading 12.1 at 1-2 gear change Plots show lean in the worst air of the two. Am I looking at correctly. [15 lean. 10 rich]. ? This is why I am confused by readings Couldn't upload a higer resolution pictures Thanks David |
Re: Racepak O2 sensor
When you get tired of reading what all the experts say... Go to the track and tune your engine where it is happy.
Best ET and MPH in the conditions available. Then hook up your gauge and let it tell you what the A/F ratio is. Your dealing with arbitrary numbers and your engine combination may not be happy with them. I loved it when I was dyno testing and had customers tell me the EGT and AF had to be certain numbers to make power. Their engines usually told them something different. When making power most engines accelerate when slightly rich at peak Tq and run up toward lean at peak HP. In the car I like slightly rich at the gear change to produce Tq and pull off the gear. |
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