Air Fuel Ratio
Posted 12 July 2019 - 06:04 AM
Posted 12 July 2019 - 06:23 AM
Passion is the driver of potential. You and I are pilgrims of the totality.
Posted 12 July 2019 - 08:48 AM
Sounds reasonable, this is a helpful article:
If you're measuring the AFR in the exhaust after its merged, then probably a bit safer to aim for the richer side.
The outer cylinders run leaner (function of the siamese ports) and if you;ve got a single lambda sensor you won't be able to pick that up.
Posted 12 July 2019 - 09:28 AM
I'd say, on that limited info, it's a bit on the rich side but lean on idle.
Idle usually is a little rich for smoothness of idle, around the the 12.5 mark.
At what, I generally aim for 13:1 on a street car and for cruise, up around the 16.5 - 17.5:1.
Posted 12 July 2019 - 01:40 PM
Are you trying to achieve maximum power to the exclusion of all else, maximum fuel economy, maximum driveability, or a combination of all three? What emissions standards are you required to adhere to?
Posted 13 July 2019 - 03:33 AM
Posted 13 July 2019 - 06:20 AM
Posted 13 July 2019 - 06:24 AM
Aiming for general good behavior in a mildly tuned 1360 with 10.5:1 compression, more performance rather than economy. No emission requirements here as the car is 25+ years old. Don’t want to burn a valve or on the other hand, wash down the cylinder walls.
In that case I'd say 12.5-13:1 for full throttle to give maximum power, 15-16:1 is plenty weak enough for part throttle operation and adjust the idle mixture for the smoothest idle.
Posted 16 July 2019 - 06:50 AM
Posted 16 July 2019 - 08:20 AM
Yes it is. What percentage of ethanol do you have. Mercifully ours is only up to 5% in our premium fuel at the moment but might increase to up to 10% in the years ahead. Our higher octane super I don't think contains any ethanol but isn't as widely available.
Posted 17 July 2019 - 05:45 AM
Posted 17 July 2019 - 07:19 AM
So you can run low octane fuel with no ethanol or higher octane fuel but with the problems ethanol brings such as lower energy density, storage, and corrosion problems. That's a bit annoying.
Have you had it on a rolling road?
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