Rear axle steering feels like a tire will fall off when at full lock

[Cogs79]

Hi,

I backed out of my driveway this morning and I thought I felt the rear end wobble like a tire was about to fall off. I shrugged it off as there is snow and ice on the roads and thought I was going over compact snow. When arriving at work, I have to turn full lock to drive right into the charging station parking spot without adjustments. I felt the same thing, the car was wobbling like a wheel is going to fall off, or something was bumping the rear quarter of the car. I reversed to trigger it again (which it did) and forward again (all while still turning). It's not a small bump, but a very noticeable wobble. It only happens when turning, and the car is perfectly straight on highways. I don't feel anything on the steering wheel or hear any strange noises. Temperature is -20C (although the car is reporting -15C...it's incredible how they can't even get the outdoor temperature right in a $140k car.). Has anyone experienced this with RAS? There are no errors, warnings or any alarms. I will call my SA to schedule an appointment (basically once every month and I haven't hit 800km on it yet). Sorry I keep sounding bitter in my posts, the issues are stressing me out given the cost of this car. I never bought a car near this price range and it has been nothing but unacceptable problems. Thanks in advance for support (emotional and technical )

C

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[W1NGE]

Hi,

I backed out of my driveway this morning and I thought I felt the rear end wobble like a tire was about to fall off. I shrugged it off as there is snow and ice on the roads and thought I was going over compact snow. When arriving at work, I have to turn full lock to drive right into the charging station parking spot without adjustments. I felt the same thing, the car was wobbling like a wheel is going to fall off, or something was bumping the rear quarter of the car. I reversed to trigger it again (which it did) and forward again (all while still turning). It's not a small bump, but a very noticeable wobble. It only happens when turning, and the car is perfectly straight on highways. I don't feel anything on the steering wheel or hear any strange noises. Temperature is -20C (although the car is reporting -15C...it's incredible how they can't even get the outdoor temperature right in a $140k car.). Has anyone experienced this with RAS? There are no errors, warnings or any alarms. I will call my SA to schedule an appointment (basically once every month and I haven't hit 800km on it yet). Sorry I keep sounding bitter in my posts, the issues are stressing me out given the cost of this car. I never bought a car near this price range and it has been nothing but unacceptable problems. Thanks in advance for support (emotional and technical )

C

This sounds like the AckermanneEffect which is common on most if not all Porsches.

https://en.wikipedia.org/wiki/Ackermann_steering_geometry

Normally it's the front wheels and worst when on larger wheel rims sizes and in cold damp weather at parking speeds.

The Macan EV has 5 degree turning on the rear axle compared to the Taycan which has 2 degrees.

I have RAS on my Taycan and get the issue on the front only but never the rear.

This might be the explanation and if so will be "normal".

 

[henrus]

Yeah. I feel/hear this on my GT3. Not related to rear wheel steering. Just the Ackermann effect and mostly due to width, makeup and temperature of the tires.

 

[Cogs79]

Thanks for the information! It's the first time I felt it despite taking the same turns/speed multiple times but never at these temperatures. Let's see how it feels when I leave the office later today. Temperature should be at -8C compared to -22C this morning. Is this a Porsche/German car thing? Never felt it in my previous cars but never had anything fancy like this Macan.

 

[Cogs79]

I just did a quick spin around the parking lot, and you're right, it is coming from the front. It's -9C now but won't warm up that much until tomorrow/later this week where we will hit +7 Celsius. Thanks again for the support, really hope this is a normal issue although it is not a comfortable thing to experience. I emailed my service advisor anyway just in case.

 

[W1NGE]

I just did a quick spin around the parking lot, and you're right, it is coming from the front. It's -9C now but won't warm up that much until tomorrow/later this week where we will hit +7 Celsius. Thanks again for the support, really hope this is a normal issue although it is not a comfortable thing to experience. I emailed my service advisor anyway just in case.

You may still experience above zero temps / low temps in general.

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