Well, maximum power is generated at an AFR of 12.6:1, so you may be too lean at 12.8-13.2:1. You may want to shoot for 12.0-13.0. Best fuel economy is given at 15.4:1 so deceleration should probably be 15.0-16.0. Ideal stoichiometric AFR is 14.7:1 but in practice that is a tad lean for idle. The air is controlled by the driver’s operation of the throttle. The fuel is mixed with the incoming air by the carburetor. The Ratio of AIR to FUEL is the AIR/FUEL Ratio (A/F). This is a ratio by WEIGHT; if 12 pounds of Air are combined with 1 pound of Fuel the A/F is 12:1, or more commonly, A/F = 12.
Drag Racing. For bracket racers, air density changes indicate an amount to adjust the engine in order to reproduce a target ET. For class racing, compensating for air density changes can affect the maximum power. Without maintaining an optimal air/fuel ratio, engine performance can be unpredictable.
Air–fuel ratio (AFR) is the mass ratio of air to a solid, liquid, or gaseous fuel present in a combustion process. The combustion may take place in a controlled manner such as in an internal combustion engine or industrial furnace, or may result in an explosion (e.g., a dust explosion , gas or vapor explosion or in a thermobaric weapon ). The LM-1 includes Logworks software that has the ability to display AFR (air fuel ratio) charts that can be used to update your EFI fuel maps and create very accurate tuning. Surprisingly, this very useful little performance tool has not caught on with the two-wheeled crowd to the same extent as it has with four-wheelers.

For unleaded fuel at sea level, the stoichiometric value (the ideal ratio of air and fuel that is required to provide the complete burn) is 14.7:1; that is, 14.7 lbs of air to 1 lb of fuel.

Adjusting fuel in K-Pro. Turning the Air-Fuel ratio of your supported Acura or Honda with the Hondata K-Pro K-Manager software is quite easy. Here are the steps: 1) Do a Full Throttle datalog 2500-8500 rpm, preferably 3rd gear. Save the datalog with a descriptive name. Now you can disconnect the laptop and take it out of the car to work on for
By installing an oxygen sensor (also known as a lambda sensor) in the exhaust of your car (or dyno exhaust), you can plug into either an Innovate portable handheld meter, data-logger, or Power output is a function of air-fuel ratio and ignition advance. Air- fuel ratio and ignition advance will also influence EGT and knock count. For an engine to be thoroughly calibrated or “tuned”, its efficiency should be optimized at all engine speeds. The A/F and ignition timing settings that deliver the maximum torque at a specific RPM

Wide-Open-Throttle Tuning. Fuel delivery in the WOT tuning process remains consistent with the model used at medium and low loads. The airflow model must now be adjusted in the upper range to match actual mass flow through the engine. Again, since the actual fuel delivery is known, the assumption is made that any difference between the

Apr 23, 2007. #2. 1) Warm up engine first (run 5-10 mins) 2)Shut off engine. 3) Back out on the idle speed screw until it justt doesn't touch the throttle linkage. Then screw it in back about 11 turns. 4) Screw in the A/F mixture screw until it stops (do not force tighten) 5) Screw out the A/F mixture screw 2 full turns. 6) Start the damn car.
With a closed-loop system, the ECU checks the air-fuel ratio against the target numbers, but now the computer uses that information to adjust the fuel delivery to meet the target air-fuel ratio. The tuner also has the option of adjusting the correction factor and also switching between open- or closed-loop.
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What does rich or lean mean? Which one is best? Theory AND practical demonstration on our Mainline dyno.How does your AFR influence engine performance, speci
Tip #2: Setting The Correct Fuel Pressure. After ensuring the carburetor you’ve selected is the right size, making sure you have the correct fuel pressure is also a critical step in the tuning process. For a gas application, it’s best to have about 6.5-pounds of regulated fuel pressure going into the carburetor.
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    • how to tune air fuel ratio