If you could view these entries on a full fuel tuning map, you’d see that these simple inputs make radical jumps in air/-fuel ratios and ignition timing in literally 100-rpm increments. While these truncated inputs work, it is a somewhat crude way to tune either air/-fuel ratio or ignition timing. The photo shows an example of a spark map.

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.

Where does the ideal air/fuel ratio come from? What makes 14.7:1 the ideal air fuel ratio for gasoline combustion? This video explains the chemistry behind i

The oxygen or lambda sensor is one of the most important and one of the most misunderstood components of a modern fuel injection system. A basic understanding of how the sensor works and how to interpret its output is crucial to the successful tuning of a high performance or racing engine. Throw a power adder into the mix and the importance of
Idle Part Throttle Air Fuel Ratio LS1. New to HP tuners, installed AEM Air Fuel Ratio gauge. What I am seeing on gauge is what HP recorded in the files attached. Seems lean at part throttle and idle. O@ is install in stock rear o2 location. It does not appear to be leaking. Wanting to swap stock LS1 intake for LS6, but afraid it will get leaner.
OveRReV. Depends on the fuel but if you have 100% gasoline (no ethanol) in your tank then your target numbers will be 13.2 max power lean to 12.5 max power rich. For gasoline with 10% ethanol content (E10) your target numbers will be a bit richer, 12.7 max power lean to 12.0 max power rich. I'm pretty sure it's 13:8 AFR in closed loop mode only. WOT reverts to the 12+ AFR ECM setting. They plug in between the 02 sensors to fool the ECM into thinking the bike is running lean so the ECM adds more fuel. They work great. Last edited by hd4evr2008; 12-31-2017 at 06:46 PM. 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.
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.
APOd5.
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    • how to tune air fuel ratio