johnlt Posted October 22, 2007 Posted October 22, 2007 I noticed that an available option on the GSA is ASC (automatic stability control). What is it on a motorcycle? I know how it works on a car but have no clue on a motorcycle. Did a search and found nothing.
johnlt Posted October 22, 2007 Author Posted October 22, 2007 I found a link on AdvRider. I guess it is just "traction control" not a true ASC. Traction control is easy to implement assuming you have the ABS sensors.
motoguy128 Posted October 22, 2007 Posted October 22, 2007 I have it on my '07 RT, but I'm not conviced it really works, or does enough to make any difference. I've spun up my rear tire acclerating from a stop light a couple times now. I never saw the light come on, but I could smell the burnt rubber and hear the RPM's rise like the clutch was slipping... but it was all the way out. I suspect it deactivated under 20mph, and even when it comes on, it allows a fairly high percentage of slip before activating. As a matter of fact, the only time I've seen it work, was 1) when I had the bike running in gear on the center stand to test it out. 2) When making a full lock turn in a parking lot (my car's ABS used to click on sometimes when doing this). In that case however, the front is moving faster... so ummm.. I don't know why the light came on.
ShovelStrokeEd Posted October 22, 2007 Posted October 22, 2007 Boy, talk about an answer to a question no one ever asked, traction control on a touring bike with only 100 or so HP. Granted, it is probably so easy to implement on an ABS equipped bike they just decided to throw it in there and call it another feature. The reason it activates on a car during full lock steering is that the outside wheel is traveling a good deal faster than the inside and the program doesn't like that kinda stuff so it will brake the outside wheel a bit. My Mercedes ML320 used to do that once in a while.
motoguy128 Posted October 22, 2007 Posted October 22, 2007 The reason it activates on a car during full lock steering is that the outside wheel is traveling a good deal faster than the inside and the program doesn't like that kinda stuff so it will brake the outside wheel a bit. My Mercedes ML320 used to do that once in a while. I figured that on my car. I assumed I was driving too fast in a tight parking lot... probably true... but I'm not sure why it went on at low speeds on my RT. I don't totally agree that 100HP bike couldn't use some traction control. It makes over 70ft-lbs of torque from 3500RPM on up. I've demonstrated that I can easily spin the rear wheel accidentally on cold pavement. I'm dissapointed because it's not sensitive enough to stop the wheel spin at times when you could use it most... at low speeds taking off from a light. Honestly, I'm tempted to cry foul, and ask for a refund for the feature from BMW or at least get ask for an explination.
HexHead Posted October 22, 2007 Posted October 22, 2007 The reason it activates on a car during full lock steering is that the outside wheel is traveling a good deal faster than the inside and the program doesn't like that kinda stuff so it will brake the outside wheel a bit. My Mercedes ML320 used to do that once in a while. I figured that on my car. I assumed I was driving too fast in a tight parking lot... probably true... but I'm not sure why it went on at low speeds on my RT. I don't totally agree that 100HP bike couldn't use some traction control. It makes over 70ft-lbs of torque from 3500RPM on up. I've demonstrated that I can easily spin the rear wheel accidentally on cold pavement. I'm dissapointed because it's not sensitive enough to stop the wheel spin at times when you could use it most... at low speeds taking off from a light. Honestly, I'm tempted to cry foul, and ask for a refund for the feature from BMW or at least get ask for an explination. There's supposed to be a button to disengage it. Are you sure it's turned on?
motoguy128 Posted October 22, 2007 Posted October 22, 2007 Maybe... although it worked on my centerstand... once the rear wheel was going about 25mph ... and the front wheel stationary... but the ABS never had a chance to "initalize". I've never tried turning it off. I'm guessing I hold the button when I turn the key on or when I start the bike.
BigAdv Posted October 23, 2007 Posted October 23, 2007 The ACS implimented on BMW bikes uses the eng management to limit torque to the rear wheel when an event trigger is detected. This could be the rear wheel spinning or the front wheel in the air. It does not apply the brakes as in some automotive aplications. Also, the bike has to acc. to 10km/h after switching the bike on for the system to be active.(after that it is active at all times, untill you switch it off with the switch or the next key cycle) Hope this sheds some light, It worked great on my GS Adv in the gravel but have not felt it come on on my RT ( which Ive taken on a few gravel roads) Earl
johnlt Posted October 23, 2007 Author Posted October 23, 2007 Thanks Earl. That's exactly what I was looking for. john
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