Going too rich will cause a sluggish roll-on to get up to speed. 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. WIDE OPEN THROTTLE: 12.5 AFRĭriving full out within a gear will bring you into a WIDE OPEN THROTTLE driving condition. ![]() If you prefer better PERFORMANCE then we suggest to run an AFR of 14 or even richer to around 13. 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. When you start to realise that this company also makes many of the parts that go into all the bikes. A top motorcycle racer commented that he couldn’t change gear that fast or that well. We are looking to fine tune an engine to get the smoothest operation. The rebel 1100 is probably the class leader for power to weight in the cruiser market and the DCT makes it a clear winner. 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
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