Listener Chris Harr sent us this great description of the various Aprilia APRC electronics components as originally posted online by AF1 Racing; what they do, how they work, and their benefits for the rider and the overall performance of the motorcycle. Thanks, Chris! Aprilia Performance Ride Control Explained All of the APRC systems work together to produce quicker lap times. Aprilia Launch Control gets you off the line faster; Aprilia Quick Shift lets you get up to top speed faster; Aprilia Wheelie Control lowers the front end under hard acceleration and out of bends; Aprilia Traction Control lets you explore cornering limits with 8 levels of sensitivity. Components:Â front and rear wheel speed sensors; ride-by-wire with three switchable maps; joystick control; +/- buttons; instrument display; two gyroscopes (one lean, one attitude), two accelerometers (acceleration and turn); ECU; gear position sensor, throttle position sensor, pressure sensor on shift lever. Aprilia Traction Control (ATC) Process:Â The rider presses the mode button and selects the desired level (1-8, 8 being most intervention) using the + and - buttons. Each level contains a minimum and maximum slip threshold. While riding, the speeds of the front and rear wheel are constantly compared, alongside parameters for the roll angle and longitudinal acceleration. Depending on the TC level selected and upon exceeding the minimum slip threshold for that level, the Traction control system enters a control state. The APRC light flashes rapidly when ATC is limiting torque. The rider is then able to modulate slip up to a maximum threshold, a point which cannot be exceeded. As the bike becomes more upright, a higher degree of longitunal slip is allowed by the system. The ECU reduces torque accordingly in two different ways - â€œpartializingâ€ throttle valves (gentle) and reducing ignition spark advance at the coils (hard). The ATC system primarily reduces torque through the throttle valves. Effect:Â Rather than a severe cut to limit acceleration and reduce rider control, the ATCâ€™s logic allows a significant degree of rider control within specified slip parameters. Even while the system is limiting torque, the rider can effectively work within a range â€“ modulating the throttle for more slide or vice versa. The system is constantly re-evaluating, so if youâ€™re power sliding out of a corner, the more upright the bike becomes the more slip is allowed. Maximum acceleration is achieved with a limited degree of rear tire slip, which enables the rider to more to fully exploit the bikeâ€™s performance potential safely. Aprilia Wheelie Control (AWC) Process:Â The Wheelie Control is able to determine when a wheelie begins and ends. Due to the accelerometer, AWC can actually determine when a wheelie is occurring rather than involuntarily reacting to differing wheel speeds. Wheelies are thus controlled much more smoothly. Using the mode button and + /- buttons, the rider selects AWC from one of three levels (3 being the most conservative). Acceleration data from the accelerometer and relative speed between front and rear wheel is compared to determine conditions for a â€œwheelie.â€ If a wheelie is detected, traction control is momentarily disabled and the length of the wheelie is controlled by limiting torque via ignition advance and throttle valve aperture, just like ATC. Level 1 allows longer wheelies and level 2 and 3 shorter wheelies. Even with the Wheelie control turned off, the Aprilia traction control is still active as long as the front wheel is in contact with the ground. With the wheelie control turned off, the ATC system allows a wheelie for 30 seconds and inhibits a wheelie if the roll angle exceeds 25 degrees. Effect:Â Wheelies become a separate variable from TC in the ECU. This is especially useful while cornering, where front wheel lift could cause the bike to run wide, yet over-harsh correction could limit performance. Instead, the bike holds the front wheel on the ground while permitting maximum possible acceleration. Aprilia Launch Control (ALC) Process:Â Rider selects one of three levels using the mode button and +/- buttons; 1 is the fastest launch level. ATC and AWC are disabled for start, but traction and wheelie control is handled by unique programming when Launch Control is enabled. Rider holds the throttle fully open while the ECU maintains a constant 10,000rpm (levels 1 and 2) or 9,500rpm (level 3). To launch, rider simply holds throttle open while feeding out clutch. During first phase of launch, wheelies are PREVENTED with ignition advance while a variable rev limit is applied, allowing more revs as speed increases. Once the clutch is fully engaged a limited degree of wheelie is permitted. Once the bike crosses 100mph and a gear higher than 2nd, ALC disengages and AWC and ATC automatically reengage at their previously set level. Effect:Â Race starts become accessible to less-experienced riders and predictable for experts. Maximum possible acceleration is achieved thanks to wheelie control in conjunction with the Aprilia Launch Control. The ALC is the only launch control system on a production bike. Aprilia Quick Shift Process:Â Rider holds throttle wide open, doesnâ€™t use clutch. Pressure on the gear selector is detected, triggering the system to evaluate throttle map, throttle position, gear position and acceleration - ultimately determining the speed of the shift. Torque is cut by reducing ignition advance and injection times, enabling the next gear to smoothly engage. Torque is then gradually fed back in to smooth the shift. Effect:Â Upshifts are completed without closing the throttle or disengaging the clutch, making them faster and limiting RPM loss. The rider can snap home instantaneous shifts on track or smooth, easy shifts on the road.
Episode 75 - Thatâ€™s NEVER a good idea. May 22, 2011
Technical note: this week weâ€™ve encoded the MP3 with slightly higher compression in mono format to provide a smaller overall file size. Please be sure to let us know how the audio quality is on your player. Thanks! James has habits an tics, and talks about some turn signal woes. He also loves his Sena headset , but needs to check out some hearing protection options. James will check back after heâ€™s tried some of the choices in a sample pack. It beats buying a new helmet! Zero doesnâ€™t have zero recalls, but if this is worst they need to deal with, then thatâ€™s Zero stress! Yamaha is building some machines in the US... is the market better? Is it a â€œbuild â€˜em where you sell â€˜emâ€ thing? Time will tell. The guys talk about an editorial from Motorcycle USA where sport bike enthusiasts thrash a Zumo 50 and have fun doing it! Did Harley really mean to use Brandoâ€™s name without permission, or was it just an oversight? Who knows? Not the guys, but that doesnâ€™t stop them from floating some ideas. Fortunately, thereâ€™s a new Kawasaki to talk about, and KTM and Bajaj continue to get closer and closer. They wrap up the show with some feedback and some discussion about possibilities of disabled and afflicted riders still enjoying the road and their machines. And the guys promise to have the 2nd winner of the signed, updated edition of David Houghâ€™s Proficient Riding picked for next weekâ€™s show.
- Ear plug discussion
- Zero recalls some bikes
- Honestly if this is all thatâ€™s wrong with them, win!
- From Yamahaâ€™s Facebook page - https://www.facebook.com/yamahamotorusa
- Yamaha Motor Corp., U.S.A., (YMUS) and Yamaha Motor Manufacturing Corporation of America (YMMC) announced today that the first production run of new all-terrain vehicle (ATV) models transferred to the U.S. from overseas facilities will take place this month at Yamahaâ€™s state-of-the-art factory in Newnan, Ga.
- The start of new ATV production in Newnan is a major step forward in the companiesâ€™ long-term strategy to transfer the majority of Yamahaâ€™s worldwide ATV manufacturing to the United States. When complete, the production transfer could add 200 or more American jobs at Yamahaâ€™s U.S. factory as well as additional jobs at the 125 North American parts supplier companies. The specific ATV models will be announced on June 8 as part of Yamahaâ€™s worldwide unveiling of select 2012 model year products.
- Cool article about small-bore scooters from an enthusiastâ€™s point of view
- â€œTires squealing, at the very edge of control, for a brief moment I was Ben Bostrom with Tommy Hayden in hot pursuit. Then I looked at the speedometer: 34 mph. But perhaps most importantly, a mere few drops of gasoline consumed. â€
- Harley gets sued - over Marlon Brandoâ€™s name on boots!
- 2012 Kawi KLX450F with launch control
- Bajaj buys more KTM
- Check disabled riders clubs, special mods, etc. Inability to use the brake lever might be very similar to amputeesâ€™ concerns and certainly bears investigation.