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I run 91 pump gas. My meter reads 12.8 in high gear. I read somewhere that it should be a little richer like 12.3 or 12.4. Does anyone have a chart of the different ratios of ethnol in the gas and what should be wide open stoich? I hope Cab Burge chimes in
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I run 91 pump gas. My meter reads 12.8 in high gear. I read somewhere that it should be a little richer like 12.3 or 12.4. Does anyone have a chart of the different ratios of ethnol in the gas and what should be wide open stoich? I hope Cab Burge chimes in
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I pretty much bunged up so reaching over the fender is hard. I'll change it to richer before I go next time and see if it runs faster. I like to go out a couple of times a year and play. At 71 with lots of surgeries and meds, racing is not realistic. I was at MATS this year and didn't look until the last run and it was 13.8 A/F. Think I could have run faster. I was shocked that I made 2 rounds. Just time trials from now on.
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I run 91 pump gas. My meter reads 12.8 in high gear. I read somewhere that it should be a little richer like 12.3 or 12.4. Does anyone have a chart of the different ratios of ethnol in the gas and what should be wide open stoich? I hope Cab Burge chimes in
If your talking at WOT then you dont care what that
number is... go for the fastest MPH then once you find
that point write that number down... thats what you
can go back to if you change anything... cruise is
the hardest point to set... idle I dont even use a
A/F ratio number... just make it idle nice
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I pretty much bunged up so reaching over the fender is hard. I'll change it to richer before I go next time and see if it runs faster. I like to go out a couple of times a year and play. At 71 with lots of surgeries and meds, racing is not realistic. I was at MATS this year and didn't look until the last run and it was 13.8 A/F. Think I could have run faster. I was shocked that I made 2 rounds. Just time trials from now on.
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Here's a chart I use:
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Here's a chart I use:
The supercharged column is a little misleading as that isn't a lambda equivalent anymore, but that's decent for targets.
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this is if your gauge is set to read on gasoline
The Basics of Air Fuel Ratio
What is lambda, and the difference between narrow band and wide band 02 sensors?
Contributed By: Enginebasics.com
Air Fuel Ratio Wideband Narrowband Gauge Sensor Bosch Tuning
One the most important aspects of the combustion motor is the air to fuel ratio in the cylinder. Like all things that explode, having the proper amount of combustible fuel to the amount of air to sustain the burn is important. Having lots of air but no fuel will cause the combustion to burn very rapidly and hot, while having lots of fuel, but no air will cause the mixture to burn very cool and slowly. Having an overly gross amount of either fuel or air will cause the combustion to not even occur at all.
What is Lambda?
Lambda is scale that relates the air to fuel ratio of ANY fuel. 1.0 is stoic for every fuel. (the chemically perfect ratio of air to fuel for a complete burn). However, stoic is different for every fuel. Some fuels may need 14.7 lbs of air some may need 6 lbs of air for a complete burn. Lambda 1.0 is always the perfect ratio for the fuel in use.
Some tuners argue that it is better to read air to fuel ratio’s in lambda since it will be accurate with any fuel. To be fair though, most aftermarket gauges will read lambda and convert that number to an a/f ratio for gasoline. If the user then knows the stoic, lean, and rich ratio’s for gasoline, he can apply those numbers to any fuel used and it won’t matter.
What I mean is that if you are running 14.7 (stoic) on a gasoline A/F gauge and you then convert to alcohol ( or E85 ), 14.7 will still be stoic on the gasoline gauge. This is because the gauge is going to read a stoic lambda reading of 1.0 for any fuel, and the gauge is going to output that number as 14.7 on you’re A/F gauge even though we know the true ratio for alcohol is 7.1-9.1.
Many times I have then seen people try and richen the cars tuning map to get down to that A/F value, not realizing that they are already at a stoic burn if the gauge set up for gasoline reads 14.7.
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Here's a chart I use:
The supercharged column is a little misleading as that isn't a lambda equivalent anymore, but that's decent for targets.