Question on Integrated Active Steering

alex_750li · 10-27-2009, 11:29 PM

I have question about the 4-wheel-steering setup.

As far as I can tell it is working because the car really turns on a dime and at high speeds there is plenty of accuracy. However, I could be fooled since my other car is basically a truck (Toyota FJ Cruiser). Yesterday I was having my front windows tinted and I noticed while they were maneuvering the car in their workshop, while turning the steering from lock to lock I couldn't see any movement of the rear wheels.

I read somewhere in the manual that the system needs to be initialized and is automatically deactivated when snow chains are fitted. Could it be that the system is offline (there are no warnings)? Are any of you able to see the rear wheels steer while the car is stationary?

Thanks.

Alex

xDrive50i · 10-28-2009, 11:16 AM

If my memory serves me right, I think the angle the back wheels turn is also dependent on the speed the car is traveling at. So if the car is stationary or moving very slowly, you will not see the back wheels turn very much. I assume it puts too much pressure on the system to try and move the wheels when they are not turning. Just like you are not supposed to turn your front wheels when they are not moving as it puts a lot of stress on the tires, rims, steering system etc...

I can tell you that I can definitely tell the difference (meaning that the rear wheels are turning) when you turn the car into a sharp corner or when you do a U turn. I can also feel it at highway speeds when changing lanes although it is a lot more subtle than at lower speeds and sharper angles.

hayden · 10-28-2009, 12:07 PM

Drive it around an empty parking lot at low speeds and stick your head out the window.

xDrive50i · 10-28-2009, 01:41 PM

Quote:

Originally Posted by hayden

Drive it around an empty parking lot at low speeds and stick your head out the window.

LOL ... just make sure the parking lot is big enough and there are no light posts... we wouldn't want you to 'wrap' your new car around one

alex_750li · 10-28-2009, 10:16 PM

Thanks for the tips and I'll try to keep from getting decapitated with your prescribed carpark tests...

I spoke to the dealer about this and he said that it only turns about 3 degrees so you probably won't see it anyway. I'm sure it's working because a car this big with such enormous wheels couldn't get around corners as well as it does otherwise.

Cheers!

Alex

xDrive50i · 10-29-2009, 11:35 AM

Hope this helps:

Hayden had this originally posted in another thread.

alex_750li · 10-31-2009, 10:53 PM

Thanks X-Drive50, I must have missed that one...

10-27-2009, 11:29 PM	#1
alex_750li New Member 2 Rep 22 Posts Drives: BMW 750Li Join Date: Oct 2009 Location: UAE iTrader: (0)	Question on Integrated Active Steering I have question about the 4-wheel-steering setup. As far as I can tell it is working because the car really turns on a dime and at high speeds there is plenty of accuracy. However, I could be fooled since my other car is basically a truck (Toyota FJ Cruiser). Yesterday I was having my front windows tinted and I noticed while they were maneuvering the car in their workshop, while turning the steering from lock to lock I couldn't see any movement of the rear wheels. I read somewhere in the manual that the system needs to be initialized and is automatically deactivated when snow chains are fitted. Could it be that the system is offline (there are no warnings)? Are any of you able to see the rear wheels steer while the car is stationary? Thanks. Alex
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10-28-2009, 11:16 AM	#2
xDrive50i Lieutenant Colonel 51 Rep 1,754 Posts Drives: '09 750i individual Join Date: Jun 2008 Location: GTA iTrader: (0)	If my memory serves me right, I think the angle the back wheels turn is also dependent on the speed the car is traveling at. So if the car is stationary or moving very slowly, you will not see the back wheels turn very much. I assume it puts too much pressure on the system to try and move the wheels when they are not turning. Just like you are not supposed to turn your front wheels when they are not moving as it puts a lot of stress on the tires, rims, steering system etc... I can tell you that I can definitely tell the difference (meaning that the rear wheels are turning) when you turn the car into a sharp corner or when you do a U turn. I can also feel it at highway speeds when changing lanes although it is a lot more subtle than at lower speeds and sharper angles. __________________ 2009 750i individual \| Citrin Black Metallic \| Platinum Merino Extended Leather \| BMW Individual Composition Package (includes Sport Package) \| Dynamic Handling Package \| Multimedia Package \| Technology Package \| Executive Package http://www.7post.com/forums/showthread.php?t=234432
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10-28-2009, 12:07 PM	#3
hayden Private First Class 7 Rep 101 Posts Drives: 2009 750Li Join Date: Jun 2009 Location: Southern California iTrader: (0)	Drive it around an empty parking lot at low speeds and stick your head out the window. __________________ ED Vehicle: 2009 F02 750Li \| Black Sapphire Metallic \| Black Nappa Leather \| Fineline Matte Wood Trim ED Tour: Aug 25th - Sep 9th 2009. (Trip Report \| Route Map). ED Progress: Welt Delivery Aug 27th; Drop off at Paris Sep 8th; Redelivery October 30th.
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10-28-2009, 10:16 PM	#5
alex_750li New Member 2 Rep 22 Posts Drives: BMW 750Li Join Date: Oct 2009 Location: UAE iTrader: (0)	Thanks for the tips and I'll try to keep from getting decapitated with your prescribed carpark tests... I spoke to the dealer about this and he said that it only turns about 3 degrees so you probably won't see it anyway. I'm sure it's working because a car this big with such enormous wheels couldn't get around corners as well as it does otherwise. Cheers! Alex
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10-29-2009, 11:35 AM	#6
xDrive50i Lieutenant Colonel 51 Rep 1,754 Posts Drives: '09 750i individual Join Date: Jun 2008 Location: GTA iTrader: (0)	BMW Integral Active Steering Hope this helps: Hayden had this originally posted in another thread. __________________ 2009 750i individual \| Citrin Black Metallic \| Platinum Merino Extended Leather \| BMW Individual Composition Package (includes Sport Package) \| Dynamic Handling Package \| Multimedia Package \| Technology Package \| Executive Package http://www.7post.com/forums/showthread.php?t=234432
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10-31-2009, 10:53 PM	#7
alex_750li New Member 2 Rep 22 Posts Drives: BMW 750Li Join Date: Oct 2009 Location: UAE iTrader: (0)	Thanks X-Drive50, I must have missed that one...
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