The LM-2 combines an air/fuel ratio meter, a full-function 32-channel datalogger, and powerful software to deliver a complete tuning workshop for less than the cost of one dyno day. Whether you have a piggy-back fuel controller, race carb, aftermarket ECU, ODB-II tuning software, or a flash/chip programmer, an LM-2 is the tool you need to dial

For example in my manual the basic setting of the screw is 2.5 turns out. Then let the bike idle. Turn out the screw for as long as the RPM increase. If the RPM dont increase anymore, turn the screw in 0.5-0.75 twists. done. The general theme is always: set screw at its basic setting. Then turn it out (aka making the mixture richer).

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.
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
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.
Next we need to account for the different ideal air fuel ratios of gasoline and E85. Ethanol has an ideal (stoichiometrically correct) air to fuel ratio of 9.0:1. Pump gasoline has an ideal (stoichiometrically correct) air to fuel ratio of 14.7:1. Here we will calculate the stoichiometrically correct air to fuel ratio for our blend. 9.00 * 0.83
The ideal (theoretical) air fuel ratio, for a complete combustion, is called stoichiometric air fuel ratio. For a gasoline (petrol) engine, the stoichiometric air fuel ratio is around 14.7:1. This means that, in order to burn completely 1 kg of fuel, we need 14.7 kg of air. The combustion is possible even is the AFR is different than 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
If you want to start playing with the Air Fuel Ratio, you need to make sure you get a good wide band set up. Though remember, the 14.1 is not a WOT target, its for normal driving and driveability tuning. WOT is tuned for power and operates off a set table of values know as Power Enrichment Mode (atleast I know this is what GM called it) and
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 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. Remove the air filter and check for fuel buildup on the inside of the filter (have a rag or towel under the carburetor to catch any gasoline that may leak out while removing). Clean off the excess buildup with rags, vacuum cleaner attachment, compressed air, etc., then replace the dirty/damaged filter if necessary.
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
Either way, I put one on the collector of my header, but you can put one on each side and either use 2 gauges, or hook up a switch to toggle back and forth. Correct. Even Autometer's instructions suggest using 2 O2 sensors and a toggle switch if you want to measure both sides.
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    • how to tune air fuel ratio