If you can fine tune injector pulse width to where you have uniform air/fuel ratio, you have achieved a near perfect state of tune across the board. To tune injector pulse width one cylinder at a time, you have to be able to read air/fuel mixture one cylinder at a time. Here are two AEM 4-Channel Wideband UEGO controllers in a dyno room. For example, 0.01 percent CO is equivalent to 14.7:1 air/fuel and 0.38 percent is equivalent to a 13:1 air/fuel ratio. Most four-barrel carburetors use two screws to set the idle mixture. To find out which it is, take the tops of the carburetors off, pull the slides, and change the position of the needle retaining clips to raise or lower the needles. Raising the clip lowers the The LambdaKing from RaytechAutomotive is a workshop tool for measuring the oxygen content of exhaust gasses, to enable fine-tuning of the air to fuel ratio (AFR). Featuring the latest LSU 4.9 technology wideband sensor, the LambdaKing is accurate, easy to use and an incredibly economical option for both the professional tuning workshop and the Theoretically, the ideal stoichiometric A/F mixture (the chemically ideal mixture of air and fuel that is required to provide a complete burn) for a properly tuned engine running on pure gasoline is 14.7:1; that is, 14.7 lbs. of air to 1 lb. of fuel. However, because of operating losses in the induction system due to intake runner and cylinder This may have been posted about before, but I have a question. I just put the JLT Super Big Air Cold Air Intake on my 2014 GT 500 and installed a BAMA custom tune. What should the Air/Fuel Ratio be running at idle and how does that compare to a stock set up? The gauge on the car is showing 13.8 to 14 at idle. Thanks a lot. Kj7Wl. Take your motorcycle to a whole new level of performance with Dynojet’s Power Vision 3. With a wide variety of tunes to choose from and upgraded monitoring capabilities to keep you in sync, you’ll be in total control for any adventure. Tap into more horsepower to the ground (WHP) than stock and optimized performance for the ultimate ride. 3884 posts · Joined 2006. #2 · Aug 28, 2008. narrow band gauges are useless. widebands are very useful. in order to tune the carb for max power i use an air fuel gauge to get right in the ballpark, then move up/down a jet size at a time testing at the track to see where your motor actually makes best power. max power WOT AFR is between 12.8 Cut the seal holding the black plastic lid in place. Gently pry the lid from the housing. To adjust, first mark the original location of the hold-down clamp on the gear wheel so you can return to stock setting if necessary. Loosen the clamp screw and rotate the gear wheel a few teeth as necessary. Clockwise leans the mixture, counter-clockwise Turn the screw clockwise. Grab your trusty flathead and start turning clockwise. It’ll weaken the mixture and cut fuel flow. So, listen for your engine’s idle to shift from a purr to rough coughs. Once your ride’s hacking like a 40-year smoker, you’ve gone far enough. Air-Fuel Ratio (AFR) - The most common reference term used for mixtures in internal combustion engines. It is the ratio between the mass of air and the mass of fuel in the air-fuel mix at any given moment. Oxygen (O2) Sensor - Is an electronic device that measures the proportion of oxygen (O2) in the exhaust gas.

how to tune air fuel ratio