Stoichiometric, the term for a "perfect burn" of fuel and air, is 14.7/1, but not all engines seem to run best there. Maximum power is usually around 12.5/1, but that also varies from one engine to the next.
I'm just confused that the op's dyno sheet shows two different fuel ratio columns.
Stoichiometric, the term for a "perfect burn" of fuel and air, is 14.7/1,
... but not all engines seem to run best there. Maximum power is usually around 12.5/1, but that also varies from one engine to the next.
Yes....Stoichiometric is an absolute term, but is influenced by several additional factors, such as temperature, density, bariometeric pressure and the heating value of the fuel consumed such as BTU/gallon or BTU/pound, as differrnt fuels require different O2 level to achieve complete combustion. Usually, a slight increase in excess air, say 1-2% of total, insures total fuel consumption but the cam profile and ignition advance characteristics factor in the final mixture's burn capabilities. Perhaps the best way to drtermine the "correct" mixture is a COMBINATION of down stream O2 (average) AND individual exhaust gas temperatures measured at the exhaust port. The EGT uniformity will show even fuel distribution and the sverage O2 will show the correct mixture levels. Just my opinion of course.Stoichiometric, the term for a "perfect burn" of fuel and air, is 14.7/1, but not all engines seem to run best there. Maximum power is usually around 12.5/1, but that also varies from one engine to the next.
I'm just confused that the op's dyno sheet shows two different fuel ratio columns.
Nick's Garage taught me that 12.9:1 is the goal under load of a full pull on the dyno.
Exactly, from the internet, on somebody else's dyno.
I have yet to see a typical HP full exhaust street car running their best numbers at the track with that reading on the wide band. Although, arguably, I have not seen a lot.
People get confused as to what an O2 meter is, what its measuring, and what it means. It is no more than a tool to understand change. How the car runs is what matters, not what the gauge says.
You've missed my (obvious I thought) attempt at humor, hence the smiley face at the end of it....Exactly, from the internet, on somebody else's dyno.
I have yet to see a typical HP full exhaust street car running their best numbers at the track with that reading on the wide band. Although, arguably, I have not seen a lot.
People get confused as to what an O2 meter is, what its measuring, and what it means. It is no more than a tool to understand change. How the car runs is what matters, not what the gauge says.
You've missed my (obvious I thought) attempt at humor, hence the smiley face at the end of it....
I have made my best pass to date with a full exhaust with tail pipes @3700 lbs with me in and 6 lbs of boost