“Spark ignition (SI) engines usually run on gasoline (petrol) fuel. The AFR of the SI engines varies within the range 12:1 (rich) to 20:1 (lean), depending on the operating condition of the engine (temperature, speed, load, etc.). Modern internal combustion engines operate as much as possible around the stoichiometric AFR (mainly for gas after-treatment reasons). In the table below you can see an example of a SI engine AFR, function of engine speed and torque”. Air fuel ratio – x-engineer.org
The OEM Honda tune most definitely does not run at a constant 14.7:1 ratio. For one, trying to start it cold would be very difficult, under deceleration it goes well above the 14.7:1 and if enough deceleration is present it will shut the injectors off completely saving fuel. Under load especially high rpm, high load 14.7:1 is too lean, there isn’t enough time in the combustion cycle even with additional timing added, the cylinder temps get too high and you’ll start having detonation which can be catastrophic. A good tuner can most definitely not just find a little bit additional power, but can bring in the cooling fan sooner, increase the rev limit (do at your own risk), top speed limiters and as others have said, create a shifting profile tailored to your specific driving style, vehicle weight, tire size etc. The OEM tune has to do pretty well across all variables, that leaves room for improvement when looking at tuning for a given situation. There are over 1100 variable for a tuner to play with on the Talon.
The OEM Honda tune most definitely does not run at a constant 14.7:1 ratio. For one, trying to start it cold would be very difficult, under deceleration it goes well above the 14.7:1 and if enough deceleration is present it will shut the injectors off completely saving fuel. Under load especially high rpm, high load 14.7:1 is too lean, there isn’t enough time in the combustion cycle even with additional timing added, the cylinder temps get too high and you’ll start having detonation which can be catastrophic. A good tuner can most definitely not just find a little bit additional power, but can bring in the cooling fan sooner, increase the rev limit (do at your own risk), top speed limiters and as others have said, create a shifting profile tailored to your specific driving style, vehicle weight, tire size etc. The OEM tune has to do pretty well across all variables, that leaves room for improvement when looking at tuning for a given situation. There are over 1100 variable for a tuner to play with on the Talon.