On the Model S, will it let you resume CC if the car is below 25 mph?
I experimented with this in my S and the CC can be engaged only at speeds at or above 20 mph.
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On the Model S, will it let you resume CC if the car is below 25 mph?
No, the first and last are almost certainly real. The first was posted here or on Telsa's forums quite some time ago and perfectly legit. The last, excessive tire wear, is an extremely common problem and something Tesla has apparently told some folks is by design (a local member was basically told by service that Tesla engineering says do not adjust camber to stop excessive tire wear). If Tesla has designed a car that causes much more wear than typical, it's certainly something that should be called out somewhere, though whether that's NHTSA, I don't know.
Well, here's what a local Portland member mentioend in an email to the Portland Tesla mailing list after his visit to the SC.Lastly, I've got to call BS on this "do not adjust your camber" comment by the SC.
When I questioned Tesla service about the abnormal wear and whether wheel alignment was the issue I was told no the alignment is probably not off BUT the car does come with negative camber ( in my mind would explain the even wear on all 4 tires) and that is the standard factory setting due to the extreme torque the chassis and drivetrain has to deal with. they (the SC) have not been able to convince the engineers differently.
Fair enough. The end result is folks with uneven wear are going to Tesla (via the SC), asking about it, and being told that's according to Tesla's engineering specs. If that's the case, then we're back to Tesla needs to come clean about their design causing abnormal wear. Maybe not via NHTSA, but it certainly has a significant impact on Tesla's cost of ownership claims. Tires are expensive, particularly the 21s.I miss wrote. I was calling BS on the sc's "do not change camber" not on a customer passing the word along
Sorry for the misunderstanding.
The issue is nuanced.
Tesla designed the coil spring cars to ride at a certain ride height and have a certain negative camber setting in the rear. This allows the car to pass federal testing standards for emergency maneuvers (FMVSS 126).
Tesla chose to produce the air cars with lower Standard ride height further allowing the car to move to Low ride height at highway speeds. Camber gain is built into suspensions such that you get more negative camber when you lower the car.
Tesla chose not to produce different length upper camber links for the air suspension cars so air cars can have as much as -2.4 degrees of camber at Standard ride height and I have seen -2.8 to -3.0 at highway speeds.
ANY toe out with anywhere near -2.0 degrees of rear camber will result in dramatically accelerated inner should wear. I consider 4 to 5K life as dramatic wear.
Others more knowledgeable than I have pointed out that "camber is not a wear angle" but it has been my experience with several other street cars that properly managing rear camber can dramatically improve rear tire life. An example is my Maranello where I could expect 12K miles with stock camber settings and 20K+ with -1.0 without a dramatic degradation in street handling.
So, back to the point about Tesla's guidance. Yes, the high negative camber is in the air suspension cars by design. However, that design decision was based on production convenience so as to have all suspensions based on the same parts and not necessarily chassis performance. The cost for that decision is higher than normal tire wear for properly aligned cars.
I put a note into William in Ownership as we have discussed other customer quality related issues in the past. I try not to inject things at such a high level unless absolutely necessary. I'm hoping the comments find their way to the right people through the normal course at Tesla.
In your communications with Tesla on this, please let them know that you can probably find some willing Tesla owners for "testing things out" in this area if Tesla will "take care of them" in the process. By "take care of them" I mean stuff like "we want to try out some things with your daily driver but if our testing does weird stuff like burning through tires every 700 miles, we'll make it right". Assuming the language in the paperwork was acceptable, I'd sign up for this in a heartbeat.I received a reply from William today indicating he would take it to the head of service. I'll give it a couple of days and then follow up with J if I do not hear anything back. I've got to believe they are way more aware of the toe out issue than I would be and have much better access to possible causes.
I received a reply from William today indicating he would take it to the head of service. I'll give it a couple of days and then follow up with J if I do not hear anything back. I've got to believe they are way more aware of the toe out issue than I would be and have much better access to possible causes.
In your communications with Tesla on this, please let them know that you can probably find some willing Tesla owners for "testing things out" in this area if Tesla will "take care of them" in the process. By "take care of them" I mean stuff like "we want to try out some things with your daily driver but if our testing does weird stuff like burning through tires every 700 miles, we'll make it right". Assuming the language in the paperwork was acceptable, I'd sign up for this in a heartbeat.
My first 21s burned through in 8500 mi. and my second set are at about the same rate (I'm currently running on my 19s after putting about 7,500 on round 2 of the 21s). I think my wear is "normal" given my usage, but I'm definitely interested in helping Tesla improve here (even if my car is just a "control" in the experiments).
Random thought - seriously a stretch here but always worthwhile asking questions like this: is the regen braking tied to all 4 wheels or just the rear 2 wheels? Assuming the rear two (because doesn't this spin the inverter in the opposite direction?), is there any chance the regen is causing this inner wear by somehow knocking the toe out of alignment on the rear wheels?