![]() ![]() ![]() Most stock to slightly modified engines will run just fine at an AFR of 15 and yield better MPG. If you prefer better GAS MILEAGE then run a leaner mixture. This condition is the most wide open for customer preference based on two factors. Most of the time you are driving your vehicle you will be within the state of CRUISING. We are looking to fine tune an engine to get the smoothest operation. With 14.6 being the industry standard stoich AFR value, we typically like to see these conditions run slightly richer. When you shift into gear and drive at a low mph we refer to this as being a LIGHT CRUISE driving condition. When you start your vehicle we refer to this as being in IDLE condition. Recommended AFR Values for Naturally Aspirated 4 Stroke Engines 14.6 AFR - Stoichimometirc Air/Fuel Ratio Value (Stoich).12.2 AFR - Safe Best Power at Wide Open Throttle (WOT).11.5 AFR - Best Rich Torque at Wide Open Throttle (WOT).6 AFR - Rich Burn Limit (engine fully warm).The higher the AFR the leaner the mixture. The lower the AFR the richer the mixture. If exactly enough air is provided to completely burn all of the fuel, the ratio is known as the stoichiometric mixture which is defined as an 14.6 AFR ratio. The AFR is an important measure for performance-tuning reasons. I stole this from the internet as I broadly agree with it.ĪFR is the mass ratio of air to fuel in an internal combustion engine. ![]() I'd be interested to know if they can tune the part throttle cruise to 14.7:1 to 15.5:1 for best MPG, with the ecu maps. Unless you were looking to wash the engine in a pool of fuel. Most tuners of NA engines aim for between 12-13:1 for best power.ġ3:2 would be 6.5:1 that's insane. These dyno printouts are always a 100% WOT run in a tall-ish gear like 5th. ![]()
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