Just tune the engine so it's running in the 13.5 - 14.7 range most of the time, and don't fret over it. As I told you earlier, it's normal for the ratios to change day to day, even hour by hour, due to climatic changes and engine temps. We dialed in 30 degrees of total timing and ran the A/F ratio at 11.8:1. Run with 114-octane Rockett race fuel, the supercharged 383 produced 643 hp and 589 lb-ft of torque at 11.4 psi. After Tuning by ear or with a vacuum port are effective ways to determine running condition, but don't actually read the air-fuel ratio. AFR gauges use an O2 sensor, just like modern cars, to provide an Typical highway driving is done on the main circuit of the carb where the air/fuel ratio is largely determined by the main jets. So, you might want to check your air/fuel ratio at cruise with one of the many hand-held air/fuel ratio devices or gauges currently available. Another indication if the main jets are correct is how the car drives. It is best to tune so that the air/fuel plot is fairly flat. Tuning Fuel at part throttle. To tune the fuel for part throttle the aim is to get the air/fuel ratio so that the engine will run correctly in closed loop. Normally the closed loop air/fuel ratio will center around the stoichiometric air/fuel ratio of 14.7:1, so it is best to tune the Tuning the Lambda Set Point. (Air Fuel Ratio) On the EA888 Gen 3 engine, a lambda set point of 1 is targeted for the entire operating range. Featuring a piston design which is profiled to suit direct injectors and an optimised combustion chamber design, lambda 1 is achieved at spark plug, for engines operated at factory load limits. 1: Set the table under "Engine>Fuel Control>General>Stoich AFR" to 14.3. or. 2: Set the commanded AFR from the "Engine>Fuel Control>OL & CL>EQ Ratio" to a value that gives me a stoich of 14.3. (ie. 14.3/14.7 = 0.97) I don't even know if this will matter that much, but I was just going to try and do it right. Here's a full-length tutorial on how to tune the main fuel table using the Hondata s300 system. We explore both open and closed-loop tuning methods and focu Grab a screwdriver and start adjusting. I cannot stress how complicated this process so be very careful. Tighten the fuel mixture by turning the fuel mixture screw clockwise; this will make it leaner because it will reduce the amount of fuel getting it. When the engine starts sounding rough, turn the screw clockwise. 6FCy.

how to tune air fuel ratio