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It appears to be so, for the moment. Are you on the stock 20" or the 22" rims? And do you have the Contis or Michelins?
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Acceleration Shudder
- Thread starter FarmerDave
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- Driving Dynamics Model X
qadaemon
Member
For what it's worth, mine is back after maybe 1000 miles with the new axles. 20" Continental tires, 90D. Hopefully this is software; I'm growing tired of it being in the SC.
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goneskiian
Active Member
I haven't noticed it on acceleration but I did notice a pronounced shudder on some very new sections of pavement (asphalt) at highway speeds (70+) on a drive a few days ago. It was already scheduled to go in for service for some outstanding aesthetic issues from delivery (trim not fitting well and passenger door lacking led's). I reported this to them and got a software update notice an hour or so after dropping it off. Coincidence? Likely.
Anyway, we'll see what they say.
Anyway, we'll see what they say.
systemcrashed
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I think the SC pushes the latest update to the car once they start working on it. I had the same experience when I recently had them look at the shudder issue. Moments after they received it at the SC, I got a notification of an update. I think this shudder is either coming from a software parameter they are actively tweaking or possibly a part that did not cooperate with an update and needed to be replaced. As of yesterday, I have not had the shudder. I did change my steering to Sport as well, not sure if that affected it.
X Fan
Active Member
Heard today that it has been isolated (manufacturing says) to a parts issue......Also, there supposedly is a list of vehicles in service system that needs to be inspected. Apparently, mine was one.
Key point: was told that this is not a safety issue but rather a driving hassle....
Key point: was told that this is not a safety issue but rather a driving hassle....
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qadaemon
Member
That affects it in some way. Granted it's a very wet day today, but on very low the shudder is almost completely gone. From the same stop sign on "standard" and it noticeably starts about 40-45 MPH.
gavine
Petrol Head turned EV Enthusiast
Had mine in for service yesterday and had them also address the shudder concern while it was there. I picked it up today. Here's what the work order says:
"Concern: Customer states: Under hard to semi-hard acceleration, there seems to be a
"shudder" of some sort coming from the drive line. Customer rode with technician.
Corrections: Exterior NVH General Diagnosis Conclusion: No Trouble Found
Confirmed presence of slight drive line shudder during acceleration to be normal
operation. This is due to the angle of the half shaft as it is rotating. This condition may be
reduced by operating the vehicle at a lower ride height."
Notice it says "slight". It's more than slight.
On the way home, I tried low on the air suspension and it still shuddered, but on "very low" it didn't. The car doesn't ride very nice on "very low" so I'm hoping there's another fix. I'll be following this thread in hopes that someone reports a solution.
In the meantime, I guess I'll be riding on very low and deal with the bumpy ride. NVH is very important to me and one of the reason I love EV's so this is somewhat disappointing.
"Concern: Customer states: Under hard to semi-hard acceleration, there seems to be a
"shudder" of some sort coming from the drive line. Customer rode with technician.
Corrections: Exterior NVH General Diagnosis Conclusion: No Trouble Found
Confirmed presence of slight drive line shudder during acceleration to be normal
operation. This is due to the angle of the half shaft as it is rotating. This condition may be
reduced by operating the vehicle at a lower ride height."
Notice it says "slight". It's more than slight.
On the way home, I tried low on the air suspension and it still shuddered, but on "very low" it didn't. The car doesn't ride very nice on "very low" so I'm hoping there's another fix. I'll be following this thread in hopes that someone reports a solution.
In the meantime, I guess I'll be riding on very low and deal with the bumpy ride. NVH is very important to me and one of the reason I love EV's so this is somewhat disappointing.
goneskiian
Active Member
Quick update on my issue. Apparently my tires (Pirelli Scorpion Assimetrico) I believe, "failed" their road balance test and are being replaced. To reiterate, my shudder wasn't under acceleration but was really noticeable at >70 on very smooth brand new asphalt.
systemcrashed
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Wow I must be lucky, I had both of these issues, both have been resolved thankfully without much of any delay. I had the Michelins though.
The techs that worked on your vehicle, @scottf200, sound top-notch. It seems like they are thorough and creative at debugging issues.
The shutter is back. Seems to be getting worse. I believe the SC only replaced one of the halfshaft's. Maybe need to replace both. Have about 8500 miles.
Same issue. Very noticeable under hard acceleration. Have about 4500 miles. 22's with Goodyear F1.
I'd love to have it set to low at all times (looks better) but unless there is sufficient camber adjustment to get it back to factory specs at that ride height then it's gonna eat tires. I'm already going to have rears dismounted and swapped from side to side to increase tire life.
I'd love to have it set to low at all times (looks better) but unless there is sufficient camber adjustment to get it back to factory specs at that ride height then it's gonna eat tires. I'm already going to have rears dismounted and swapped from side to side to increase tire life.
Phil Seastrand
Member
What I find interesting about this problem is that for me, it didn't start until around 4000 miles. It wasn't there and then it was. I can't see how a balance issue with the half-axles would behave this way. This is why I think it's firmware related.
scottf200
Well-Known Member
I apologize of the confuse. I was looking at your post on my smart phone (vs PC) and accidentally hit 'disagree' instead of the 'agree' response. I was very happy with results of that. I've had other issues with the techs not solving my concern and just doing some "adjustments" or "recalibations" and checking off the service as done.
You make a valid point. Perhaps there was some shifting or loosening of something. I don't "hotrod" mine all the time so I'm not sure exactly when it started. I know it has not always been there. I have 16K on in 6 months.
systemcrashed
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I also noticed it around the 4-5k mile mark. But I also feel like it was related to an update, it came about suddenly as if it was overnight. Service replaced both half axels, when SAS is set to Very Low it's not noticeable. Since the last service I have a new noise coming from the frunk area as if the AC fan blades are hitting the cowling. It changes as the G forces shift while driving.
gavine
Petrol Head turned EV Enthusiast
Doesn't the car automatically lower itself on the highway? If what you say is true, then wouln't the car eat tires when driving at highway speeds anyway?
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