[big dave]

This is the strangest thing I've experienced with this car. On a recent trip to the beach, I stayed at a hotel with a 2 story parking garage. Initially I parked underground but thought that because I was staying on the 2nd floor, and no one else had parked upstairs, it would've been to my advantage to have the entire 2nd floor to myself.

I was concerned about the steep grade the car would have to climb, and if I would have clearance once I turned to get onto the ramp.
Here's the problem; Hopefully I can paint this picture where everyone can understand. The ramp was accessible from either direction. First, I tried to turn left onto the ramp, very gingerly moving forward to make sure there was no contact with the pavement. I was able to get half way into the turn and the car would not move anymore. It literally felt like the transmission popped out of gear and went straight to neutral. I would give it gas, but the car would not move. I didn't want to give it too much gas in case the trans was slipping or the clutches in the rear were not locking. I got a little scared at this point and decided to back away from the situation. I then decided not to come in from the other direction. I am now trying to turn right to go up this steep grade and the car did the same thing. WTF!!! It made no sense whatsoever. The next day when I found the opportunity, I was able to back into a space that was directly at the bottom of the ramp, and then I had no problem climbing the steep incline at all.

What am I missing here. Is there some kind of program or sensor that would disconnect the transmission in this manner. It was kind of embarrassing when a couple guys were walking by asking if there was a problem with my brand new car. One noted that he thought the posi unit in the rear wasn't locking. I had no response.

I took it to the dealership, described the problem, but could think of no place I could go to replicate the problem...besides this garage which was 3 hours away .

The car has no problem when being launched. It spins both tires equally.

Has anyone else experienced this strange phenomenon?

[Shorty45]

Hey Dave, I saw you have the A10 so it might be different but I had a situation getting into a parking lot where it had a weird grade to it. On my car (M6), it sort of teetered for a second because one of the back wheels came off the ground. It kinda took a second for it to engage and go forward into the lot. Is that what could have happened? One of your wheels came off the ground?--Shorty

[Infern0]

I have not, but it sounds like the eLSD as you may have been approaching one wheel in the air and it registered that you were "slipping", and it cut power to the traction wheel still making contact. Just a complete SWAG. If I'm correct, all nannies off would have "fixed" that.

[Infern0]

Originally Posted by Shorty45

Hey Dave, I saw you have the A10 so it might be different but I had a situation getting into a parking lot where it had a weird grade to it. On my car (M6), it sort of teetered for a second because one of the back wheels came off the ground. It kinda took a second for it to engage and go forward into the lot. Is that what could have happened? One of your wheels came off the ground?--Shorty

Posted at the same time. My thoughts exactly.

[BMWM.D.]

Yep...wheel was off the ground I bet. I'm thinking if you'd given it more throttle it would have started moving again. I've felt this phenomenon in my ZL1 as well as corvettes I've owned. The E-LSD makes it a little different vs a mechanical limited slip, but I'm sure it's the same situation.

[big dave]

I guess it's entirely possible that the wheel came off the ground but, the next day I watched as a 5th gen Camaro, a newer mustang, and a Challenger make the same climb, and though it wasn't easy for any of them to make the turn, none of them had my problem making it up the hill. One may have spun the tires as it unloaded them making the turn. The others seemed to be fine.

[thompstl1]

I made a sharp turn onto a steep driveway and one wheel came off the ground. I was "stuck" for second until the car rolled back.

[WhiteBoy18]

Seeing other cars make the same turn doesn’t matter, they are all different ride heights/widths and different slip% settings I’m sure. Also your wheel doesn’t have to even come off the ground as in if you pull the load off of the wheel the elsd starts to anticipates it from my understanding. This happens to me every time I pull into my car wash and I just power through it (M6 though so may be different for you)

[GarnetRedJuan]

Basically the short travel on the zl1 suspension is causing you to go on 2 wheels, teeter and not get traction. Happens to me all the time

[big dave]

Originally Posted by GarnetRedJuan

Basically the short travel on the zl1 suspension is causing you to go on 2 wheels, teeter and not get traction. Happens to me all the time

I honestly don't think it was far enough into the turn for the wheel to lift...though I couldn't swear to it. Even so, why would the car not move? Is it programmed to disengage the drivetrain in this situation?

[BMWM.D.]

I've never gotten out of the car to see what's going on when I've felt them get "stuck" like that, but I always assumed it was a wheel off the ground or unloaded to the point it has no traction. I actually felt it last night pulling up a pretty steep driveway at an angle.

I really doubt it's doing anything to disconnect the drivetrain, but maybe the E-LSD isn't locking (for whatever reason) and it's operating as an open-diff. At that point one wheel off the ground = not going anywhere. I'd think that if you gave it some throttle, it would lock up and you'd be able to muscle it up the incline. That's just a theory of course.

[USP45]

When driving in AR a few weeks ago we hit a section that had very sharp 10mph 180 degree switchback turns. I noticed on a few of them that when I went to accelerate out of the turn the inside wheel would spin like an open diff for a second and then the car would start moving like the outside wheel was just then starting to get power to it. It didn't really bother me because it is a very out of the normal circumstance, but I did notice it.

[17CamaroZL1]

Originally Posted by BMWM.D.

I've never gotten out of the car to see what's going on when I've felt them get "stuck" like that, but I always assumed it was a wheel off the ground or unloaded to the point it has no traction. I actually felt it last night pulling up a pretty steep driveway at an angle.

I really doubt it's doing anything to disconnect the drivetrain, but maybe the E-LSD isn't locking (for whatever reason) and it's operating as an open-diff. At that point one wheel off the ground = not going anywhere. I'd think that if you gave it some throttle, it would lock up and you'd be able to muscle it up the incline. That's just a theory of course.

This ^

I had the same thing happen to me pulling into my nephews driveway. It is really steep, so being afraid the splitter would drag, I turned in to hit the drive at a 45° angle. Once my inside rear tire made it near the bottom of the drive, the car stopped from the tire spinning. At first I let off the gas, it rolled back a bit, and I gave it gas again. It pulled forward a little and did the same thing. I tried it one more time, giving a little more throttle, and it went on up. Either I carried enough momentum to make it far enough across the dip for the tire to start regaining traction, the diff started locking up, or both.