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  #21  
Old 01-07-2018, 01:52 PM
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Quote:
Originally Posted by andrewwynn View Post
I will do a couple. Tight turns and drifting on some snow wirh and without the DSC to compare and see if you can use as reference
Sounds like fun!
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  #22  
Old 01-08-2018, 02:41 AM
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I wait all year for a chance to have an x5 do what they are made for.

Like the occasional hour of being the first one to drive down a freeway that hasn't been plowed or salted.



In an hour of driving I saw an approximate total of 1 mile of any identifiable road marking (or road for that matter) I just aimed for the middle of the crown when I could detect it. About 3 times in that hour the "driving by Braille" bumps helped me find the lane because there simply weren't any.

Had an absolute moron pass me in a two wheel drive sedan. One quick tap of the brakes he would have been in the ditch.

I did some preliminary testing but nothing objective to report yet.

I can report this though: to test "just how much does DSC help" disabled while turning fairly hard in a "near frictionless" environment and the short version is the x5 is nearly undrivable in slippery conditions without it.

The long version: just as with abs allows steering while braking by preventing a skid: non-turning wheels do not steer.

The problem is: engine braking. You can skid without brake from engine braking happens all the time with front drive cars, take foot off brake to coast but engine braking skids the tires and suddenly you are over the centerline.

So in my quick test I has sped up to perhaps 35mph started a firm left curve close to traction limit and hit the DSC button.

The car instantaneously yawed left about 10 and would have surely went 90 or more if I didn't release the wheel to let nature find the right angle to stop the skid.

It's hard to say if I was heavy throttle or engine braking was the cause but the drive train on the x5 is excellent at making all your wheels go the same speed and so instantly all four wheels were going a speed other than the speed of the car, it acted exactly like pre-abs and stomp on the brakes.

It will not be difficult to determine if DSC is operating!
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  #23  
Old 01-08-2018, 03:04 AM
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I guess Ive tested dsc to its limits with the driveway.

The e46 and e39 needed it turned off from time to time with the need ranging from the first push to full on turning it off. Mud can cause you to get stuck because of the dsc. It really does help most of the time though.

But if things get REALLY slick the brakes locking down plus the power being pulled from the engine in attempts to gain traction will cause you to get stuck. If you turn it all off and gun the motor you can make it where you weren't before with it turned on.

The X5 I haven't had to touch the control so far. Its handled everything needed flawlessly. Now the first reaction I get every time I tell someone that is "its 4x4 so what did you expect" or "it has all wheel drive so that's why".

What they don't realize is how many awd and 4x4 vehicles I have had to tow up my driveway that have managed to get themselves stuck.

The biggest thing the X5 has done that impressed me so far is two different situations I was in with it.

The first was in the driveway in a section I normally only go thru with my large trucks. My daughter had brought her 528i over to have the wheel bearing replaced. Where the 528i was sitting made getting the X5 out the normal way impossible so I had to go out the driveway section reserved for large 4x4 vehicles. Its not that its muddier or more slick than the normal way its the ruts. These ruts caused me to end up with the passenger side front wheel 2 feet off the ground and the drivers side rear wheel 1 foot off the ground at the SAME time.

If you have any experience with 4x4 trucks you know this is a recipe for stucksville. Without a locker in at least one of the axles your not going anywhere as the vehicle will just spin the free tire on the front and rear ends. So as soon as I felt the teetering effect I knew what happened. My "audience" was all going on about "its stuck now for sure!"

The X5 paused for about 2 seconds like it was thinking. Nothing happened for 2 seconds then it just crept on like it was nothing. THAT impressed the hell out of me.

The next time was during the massive snow we got. Half of the gas station's parking lot I was at doesn't get sunlight most of the day. That side was solid ice. There were 4x4 trucks stuck and spinning all over it. I waited for a pause in their attempts to free themselves and then drove thru them like an obstacle course. Never spun.

Not only did THAT impress me it also impressed the trucks owners that were stuck. I had a bunch of them coming up to me while I was getting gas in the gas cans for the generator asking what I had modded and stuff. I told them it was all factory with zero mods. None of them believed me. Then I had different ones asking me to tow them out but I had to explain I don't have a trailer hitch so I couldn't help them. I went back later in my F150 4x4 and pulled several out.

Little X5 is a pretty popular subject around here after all of that. I have had people walk up to me even after that asking if this is the X5 they had heard about from the snow day. But that's more small town than fame

Point being that at least with Xdrive the dsc stuff rocks but with any dsc situation knowing how to use it turning off wise can make a huge difference between stuck or not.

I actually use it on my 323i when autocrossing. I just knew it needed to be off when I first started runs with it since I knew how I ran my other cars. I had much better times with the dsc on with the 323i.
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  #24  
Old 01-08-2018, 03:50 AM
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I have two similar examples to share.

My version of the cross wise tires off the ground: simply leaving a field to an elevated road through a ditch: the ditch to road interface was too Sharp of a transition to go straight without bottoming out so angled exit is required. Because of the sharp transition that means the first wheel to the road way will leave the ground but also the opposite will lose contact pressure.

I was trying to test the limits so was going as slow as possible and at <1mph the low force rear wheel spun a little so I backed up and went about 2-3 mph. As the front left wheel left the ground it started to spin maybe 180 before with an obvious this it stopped and the car pulled right out.

The other: I parked in a water puddle about 4" deeep. That overnight was sub zero and x was now 4" deep in ice.

The car simply drove right out no spin whatsoever


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  #25  
Old 01-08-2018, 04:51 AM
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Even though we got less snow, I've been to ski resorts around here and the only time the DSC even blinked was when I floored it on snow from a standstill.

The X5 has been flawless but I'm cheating a little, being on snow tires like I do on all my cars all year round. Good enough in the summer, great in the winter.
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  #26  
Old 01-08-2018, 07:05 PM
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A little bit of shudder when turning

DSC is operational a lot more than when it blinks.

Awesome to see somebody else that only uses snow tires. I happened into the practice by chance (bought car in spring with snow tires and spent entire budget on the car) but after the ten or so times it's kept me out of accidents. The ROI for just wear out winter tires faster vs two sets is many many years.

I've many times encountered slick surfaces where I was very happy to have more traction than literally everybody around me.
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  #27  
Old 10-07-2018, 10:44 PM
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Quote:
Originally Posted by bcredliner View Post
Does this happen in both directions and every time? Do you feel it in the steering wheel or the shifter?
Sorry to bring up an old thread, but I have this exact same issue on my 03 4.6is
And the shudder is on my steering wheel.

The mechanic said it may very well be the u-joint on the steering shaft.

Can anyone confirm his suspicion?
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  #28  
Old 10-07-2018, 10:52 PM
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Quote:
Originally Posted by Maruzo View Post
Sorry to bring up an old thread, but I have this exact same issue on my 03 4.6is
And the shudder is on my steering wheel.

The mechanic said it may very well be the u-joint on the steering shaft.

Can anyone confirm his suspicion?
It may be the steering in your case but I DID finally get around to changing my xDrive fluid and resetting the fluid wear adaptations. This work cured the slight driveline shudder I had when accelerating during a tight turn, i.e. pulling away from an intersection.

For some reason changing the xDrive fluid also seemed to sorted the transmission 2-1 slam, although I have zero idea how it could have done so...
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  #29  
Old 10-07-2018, 10:53 PM
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I've recently seen a thread where the steering u-joint was the source of problem but I believe it was a click click click type sound related to the wheel position.

What you are describing sounds like in the suspension.

Clarify: do you mean the steering wheel wobbles a bit left and right as you steer a constant radius or do you mean you feel an instability of some type as you steer


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  #30  
Old 10-07-2018, 10:56 PM
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Quote:
Originally Posted by SEVEN40iL View Post
Thought I would bump this thread up as I am having a similar issue with my X.

Feels exactly like the OP.

Slight shudder on a low speed turn, like turning out of my driveway, or making a turn from a stop of any kind, there is a slight shudder until the vehicle straightens out or speeds up.

Is this a differential issue? I have read here that many of you have done front and rear differential flushes. Would that fix my issues? Or do you guys have any other ideas of what it could be?

Thanks in advance!
Have this issue, shudder on the steering wheel. Only happens during parking lot menuvers when I turn left or right while backing up, and when I move forward right after.

No shudder If I take off from garage (moving forward).
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