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Acceleration / deceleration instability - new 85D

Hi,
I have a new 85D (19" standard wheels, air suspension). I am experiencing a brief steering/driving instability that I wanted feedback on. It is a pretty pronounced instability that can be felt only when the car makes a rapid transition from (1) speed to higher speed (eg punching it at 50mph) and (2) high speed to lower speed (eg rapidly lifting my foot off the accelerator when going 70mph). It seems to happen when the car is shifting its weight from front to back and back to front. The instability feels like the whole vehicle is momentarily (less than a second) out of control and is imbalanced while the weight transitions.

- tire alignment seems fine, on smooth surfaces I have no consistent drifting to one side or the other.
- it doesn't seem to matter if I'm in range mode or not.

Any thoughts / feedback would be awesome!
 

tezzla

Member
Supporting Member
Jul 14, 2013
652
324
SoCal
My 1st Tesla had the coil suspension (& it felt very "grounded"), when I got my 2nd (with air) I found it very loose on acceleration, I thought for sure it had a problem. But I quickly got used to it. I don't even notice it anymore. My guess is it's just the way the air feels. You might try setting the suspension in the LOW setting and see if that makes a difference. btw: I always keep mine in low (& I've added lowering links also).
 
My 1st Tesla had the coil suspension (& it felt very "grounded"), when I got my 2nd (with air) I found it very loose on acceleration, I thought for sure it had a problem. But I quickly got used to it. I don't even notice it anymore. My guess is it's just the way the air feels. You might try setting the suspension in the LOW setting and see if that makes a difference. btw: I always keep mine in low (& I've added lowering links also).

Thanks for the quick reply - I'm going to try the standard vs low experiment.
 

TonyOrr

Member
Jul 10, 2014
48
0
London
I have the exact same issue with my P85 (non D). The car is in with Tesla at the moment whilst I'm on vacation but I have recieved a report through that the issue has been fixed. The resolution is described as "Toe link to the sub frame & Toe link to the knuckle found to be below spec. Inspected re torqued.".
 

ra-san

Member
Dec 26, 2008
296
5
San Diego, CA
Above replies are great and definitely have components checked, but don't completely discount that it could be alignment. Rear toe being a bit out could manifest similar to what you are describing I think, but wouldn't necessarily show when not punching it. Although I don't think that would cause the problem when decelerating just accelerating or cornering hard.

Point is that things could seem just fine under sedate conditions but still show on the edges with alignment issues, and if they are going to be checking suspension, might as well check alignment too. If nothing else, your tires might thank you.
 
I have the exact same issue with my P85 (non D). The car is in with Tesla at the moment whilst I'm on vacation but I have recieved a report through that the issue has been fixed. The resolution is described as "Toe link to the sub frame & Toe link to the knuckle found to be below spec. Inspected re torqued.".

Thank you for this - I've got an appointment at my Tesla service center to evaluate the issue.

@ra-san - Certainly will request alignment check when I take the car in for service, thank you.

Will update after I find out more.
 

thegruf

Active Member
Mar 24, 2015
2,309
2,108
indeterminate
What's worrying about this is that Tesla should still have suspension alignment issues on new 85D's.
This ought to be pretty fundamental stuff in automotive assembly.

Two questions come to mind.

1. Once adjusted correctly does it stay in place or does it drift out of spec again?
2. the OP clearly noticed the issue and got it dealt with, but how many owners out there have the issue but havent realised it is a QC problem and are maybe a little disappointed in the handling?
 
What's worrying about this is that Tesla should still have suspension alignment issues on new 85D's.
This ought to be pretty fundamental stuff in automotive assembly.

Two questions come to mind.

1. Once adjusted correctly does it stay in place or does it drift out of spec again?
2. the OP clearly noticed the issue and got it dealt with, but how many owners out there have the issue but havent realised it is a QC problem and are maybe a little disappointed in the handling?

Important to say that this was not an issue with my (air) suspension, it was tire/wheel alignment.

RE: #1: Proper alignment on any vehicle is crucial to preventing highway drifting and the issue that I had; imbalance during hard accel and sudden decel. During my experience I learned that alignment, especially on a Model S, needs to be precise because Tesla is trying to achieve a balance between stability and efficiency (e.g. more range) with their alignment specification. Someone with more technical knowledge of wheel alignment may be able to explain how alignment impacts efficiency. Lastly, alignment can definitely go out of spec again like with any car that is driven on roads that are smooth, in complete disrepair, or somewhere in between. Hitting bumps or potholes at street or highway speeds even if small or medium in size could impact alignment.

RE: #2: I take full responsibility for being aware of my vehicles general health and condition and other drivers should too. When something doesn't work or seem right, I report it. I think Tesla, more than any other automobile company, appreciates, seeks out, and acts on customer feedback. Tesla Service is just a call or email away.
 

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