![]() The result is great throttle response in all conditions at all throttle positions. Then I finish it on my dyno to tune for best power. This is the best way to get the part throttle openings tuned. When i develop a flash I don't just dyno tune a customers bike and sell that as my flash, I data log bikes with the different set ups on the road in real world riding conditions. What makes my flash better then my competition is I actually owned an fz09 from 2014-last year. Here are step by step directions on how to remove the ecuįz09 ecu removal/ air box mod ()Ģ014-2020 MT/FZ/FJ-09/XSR900/GT 900 tracer custom flash () Going too rich will cause a sluggish roll-on to get up to speed.Thanks for the recommendations and supporting a forum sponsor ! Best performance for most vehicles is around 12 AFR. Again, we typcially like to run a richer AFR here to get the best performance. We refer to any fast turn of the throttle as being in an ACCELERATION driving condition. Getting up to cruising speed or getting ready to pass someone, you usually are looking for the performance to get up and go. Going too rich will have the opposite affect and decrease your performance. Best performance for most vehicles is in the 12.5 to 13 AFR range. We typcially like to run a richer AFR here to get the best performance. This condition is where the peak horsepower value is obtained. If you prefer better PERFORMANCE then we suggest to run an AFR of 14 or even richer to around 13.ĭriving full out within a gear will bring you into a WIDE OPEN THROTTLE driving condition. 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 IDLE / LIGHT CRUISE: 13.5 AFR The higher the AFR the leaner the mixture.Ħ AFR - Rich Burn Limit (engine fully warm)ġ1.5 AFR - Best Rich Torque at Wide Open Throttle (WOT)ġ2.2 AFR - Safe Best Power at Wide Open Throttle (WOT)ġ4.6 AFR - Stoichimometirc Air/Fuel Ratio Value (Stoich) 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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