Jul 20, 2015
Soolim When are we going to get individual tire pressure readings for each tire? Majority of all cars have it! Tesla should have it instead of a simple warning.:frown: This should not even wait for V7.�
Jul 20, 2015
jerry33 There is no date for this feature.�
Jul 20, 2015
NigelM Considering that incorrect tire pressure will impact range (and safety), there should be a target to introduce it.�
Jul 20, 2015
Phil K They have no plan to add this feature.�
Jul 20, 2015
jlucero that is a shame....is there a way to at least see that all tire pressures are sufficient? or do you have to get out of the car and manually check it? or does the car tell you when a tire is low?�
Jul 20, 2015
robaross Get a FOBO. Easy to set up. App shows tire pressures and temperatures.�
Jul 20, 2015
Soolim Without spending more money (such as aftermarket options), you need to do it manually with a tire gauge on each tire. But you need to pay big bucks for a Tesla to have that privilege
�
Jul 20, 2015
Bangor Bob Got Torque? Try the following PIDs:
222813: Driver Side Front Tire Pressure
222814: Passenger Side Front Tire Pressure
222815: Passenger Side Rear Tire Pressure
222816: Drive Side Rear Tire Pressure
Equation: ((256*A)+B)/3+22/3 in kPa (((256*A)+B)/3+22/3)*0.145 in PSI OBD Header: 726
That's for a Ford, no idea if Tesla will use the same PIDs, but it's possible.�
Jul 20, 2015
Soolim All I am asking is simply display the pressure measurement from the TMPS of each tire on driver's display and/or touch screen.�
Jul 20, 2015
JimmyAZ My car told me last week that my rear right tire was low. It doesn't give the pressure, but at least it tells you which tire. I checked all of them and they all were at 40lbs except for rear right. I hope that helps!�
Jul 20, 2015
jlucero i second that!�
Jul 20, 2015
marcad80 My wife's Chevy Volt reads PSI for every tire..... Guess for the Model S I just bought, I'll have to go and buy a plastic pencil gauge and get on my knees......�
Jul 20, 2015
apacheguy I agree. Should be a priority for v7�
Jul 20, 2015
steve841 I've whined Tesla should have a diagnostic or system status screen for a long time ...
TPMS, 12V status, Main battery, temps .... Might just save them some money on warranty costs.�
Jul 20, 2015
spc It is really sad sad sad that for the money we pay for the car we dont at least have what the the cheap one have. my volt has it. and i have also asked for it.�
Jul 20, 2015
kuttakamina Yep, actual pressure read outs from inside the car is something even cheap cars do now. No reason for tesla to not offer it.�
Jul 20, 2015
Soolim It will help even more if Tesla give us a reading so that we can monitor any abnormal drop in pressure (for possible leaks) and take advance measure to correct the problem instead for waiting for the warning which may not be as convenient to fix. Is the 40lbs you have on your tires not too low? My service advisor inflate my tires to 45lbs.�
Jul 20, 2015
kuttakamina Also any idea at what pressure does the "low" warning come on?�
Jul 20, 2015
JimmyAZ I felt the same way. I inflated them all to 45lbs.�
Jul 20, 2015
JPP I am very glad I installed FOBO Plus on both of our Model S. Really nice to know pressures and temperatures. Interesting to see the wide swings with temperature. Nice to get warnings when readings are out of the parameters I set but not so low that it triggers the TM OEM TPMS. Can monitor both cars with 1 iPhone (FOBO Share).�
Jul 20, 2015
JimmyAZ I'm curious - what was the reason you chose the Plus over the standard FOBO Tire? It appears the only difference is the standard goes to 50psi and the Plus goes to 87. Is there more?�
Jul 20, 2015
jerry33 Agreed
- - - Updated - - -
Because of the 87 psi maximum, the Plus would likely be more accurate at Tesla pressures.�
Jul 20, 2015
Merrill Tesla should have this, my tires somehow where cupped at 9000 miles and never got a warning. Check my tire pressures once a month, guess I will need to do it more often. It is my understanding that you will not get a warning until the pressures are 5 pounds under recommended inflation. So you could be driving around for a while with a tire or tires at 4 pounds under and not know it.�
Jul 21, 2015
gzerninplatz With the standard FOBO monitors, tires at 45lbs standard pressure will heat up to 50lbs on a trip - and that product has a max pressure of 50lbs, so you will get constant over-pressure alarms. The Fobo plus lets you bump the max pressure up a few pounds and avoid that...�
Jul 22, 2015
JimmyAZ Ah that makes sense. Thanks for pointing out the high pressure alerts. I didn't realize they also alerted for that.�
Jul 24, 2015
Vip You mean the car displayed on the screen which tire was the problem? I had a low pressure warning yesterday and all it said was "Tire pressure too low". Had to check all the tires to figure out which one it was!
I know Tesla has a way to look in the logs and see what the tire pressures have been. When I had my car in for service they said that my right rear tire pressure was low mutliple times and wanted to make sure nothing was wrong with the tire. So Tesla should have a way to implement an update that tells us which tire is the problem.
FYI: I have a 20xxx VIN�
Jul 24, 2015
JimmyAZ Absolutely. Yeah it stated the rear right was the problem tire. Perhaps that did come on an update and your car will now do that!�
Jul 24, 2015
Ingineer According to Tesla's documentation, they use 2 different brands of TPMS. Maybe the newer system has the location capability.�
Jul 24, 2015
apacheguy I have the old Baolongs. At annual service, the tech reported checking the logs and norticing two specific TPMS were reporting timeouts and they were targeted for replacement. Seems to be even the old system has this capability.�
Jul 24, 2015
Ingineer Maybe it's that the just register which unit is at which location with a handheld reader (They have one) and then program the car. I know some cars are like this, so when you rotate the tires, the locations will be swapped. There's no way for us to tell unless the car reports to us which wheel is low. At some point I'll check my car and see if it does.�
Jul 25, 2015
bollar Deflated a tire, so I can answer specifically for a 2012 w/ 21" wheels and 6.2 firmware. No indication of which tire deflated.
This alert presented around 20 psi.
�
Jul 25, 2015
jerry33 Note that in normal use by the time 20 psi alert has been reached there is likely already considerable tire degradation. Real PSI readings are needed or a way to set the threshold to a reasonable value (like 40 psi). I suspect many of the pothole damages are because the tires are slightly low but not low enough to alert. With a real PSI display, many of these damages could be avoided.�
Jul 25, 2015
Soolim Tesla is supposed to be high tech car company. I had a 2008 Porsche Cayenne before, it reports all the tire pressure reading on the display. When I rotate the tires, the car computer sense that change, and ask me to simply reset the tire location with a push of a button. When I bought a new set of winter tires and wheels with after market TPMS, it simply ask me to acknowledge the change, and works like a charm. Now we are comparing a 2015 model MS to a 2008 model SUV. I am not impressed at all. In another long thread, there were tons of discussion on the AP delay.�
Jul 25, 2015
bollar Agree and why I have Fobo.�
Jul 25, 2015
apacheguy +1. 20 psi is far too low�
Jul 25, 2015
Ingineer When the car is not driven, the TMPS goes into low-power mode and will not notice small changes in pressure. Apparently you have to drive the car over 30mph for a few minutes before it goes into full monitoring mode where it will detect the small loss of pressure.
So if you are going to accurately test the low threshold, do it right after driving around the block first.�
Jul 25, 2015
JPP Ditto on the FOBO....�
Jul 25, 2015
ratsbew This is a feature that's mind blowing to me that the Tesla doesn't have. My 2011 Chevy Cruze shows me individual tire pressures.�
Jul 26, 2015
AmpedRealtor And the fact that Tesla still hasn't implemented it tells me that they can't.�
Jul 26, 2015
jerry33 Well, they haven't implemented shuffle or repeat on "Favourites" either, but I don't believe it's because they can't.�
Jul 26, 2015
taurusking I wonder why Tesla is not making small tweaks...its not like they are difficult to implement�
Jul 26, 2015
jerry33 Given the amount of hardware changes since the initial rollout, backwards compatibility issues, new features promised, and the limited number of engineers (particularly software QA engineers) it's not surprising that this is not number one on the list. When dealing with multiple hardware (the TMPS has been changed more than once) even small tweaks are non-trivial.�
Jul 26, 2015
travwill Ok, so i have maybe a dumb question for anyone/everyone on here, as not reading backwards too far...
Is it possible with the air pressure sensors Tesla uses, and perhaps other hardware required, to do what many lower end carmakers do, and allow for a display of PSI per tire, in a neat little graphic that shows PSI on each tire, alerts to a specific tire when low, allows for setting your pressure warning levels, etc?
This is something I've had in previous cars 2008+, VW Touareg, etc. How in the world does my brand spanking new MS not have this? Or is it another software add possibly?
-T�
Jul 26, 2015
jerry33 Tesla has used different TPMS over time. The diagnostic display shows that information (or did at one time, more than one TPMS has been used). What I don't know is if they can determine the wheel position. It's believed this is a programming issue, not a hardware issue.�
Jul 26, 2015
trils0n On my car there is an alert before the Red 20 PSI Very Low Warning. It is a yellow Tire Pressure Low warning around 30-35 PSI. It sometimes takes maybe 0.1-0.2 miles of driving before it recognizes low pressure.�
Jul 27, 2015
Vip My tire pressure was low about 4 days ago. The warning read Tire Pressure too low. When I checked it was at 38psi.�
Jul 27, 2015
mknox Yeah, my '09 Cadillac did all of that too. The display on the dash worked in "real time" as well. I could hook up my compressor and watch the PSI numbers on the dash climb as the pump worked, and when it reached my target, I would check it with a high quality pressure gauge and it was spot on with the car's own display.�
Jul 27, 2015
Ingineer The hardware is a stanrd TPMS system from an automotive supplier. Tesla didn't roll their own, they just did the integration. Clearly if service can read the pressures, the hardware is capable of it, so it's definitely just software at this point.
Yes, maybe it's down on the feature list in the 1000's and they just don't have time. Who outside of Tesla really knows what is going on there?�
Jul 27, 2015
AmpedRealtor Maybe their TPMS guy is coding the Autopilot... which would explain a lot of things, actually.�
Jul 27, 2015
dhanson865 Considering I can check tire pressure with leafspy on my Leaf they better support the equivalent or better on the Model 3 in 2017/2018. Just no reason not to allow checking individual tire pressures on a modern car.�
Jul 27, 2015
travwill Here's to hoping this already infamous V7 has a new TPMS/software to let us see PSI per wheel, customization, etc.�
Jul 28, 2015
N4HHE Each TPMS sensor has a unique serial number which allows your car to eliminate the signals from other cars. So there is no need to do direction finding to know which tire is low, you just have to ID the location of each tire when the TPMS sensor is initially registered to the car, and when tires are rotated.�
Jul 28, 2015
apacheguy So why then do newer cars specify the affected tire while older cars do not?�
Jul 28, 2015
N4HHE There is a good chance the data from each wheel is not calibrated. When you "reset" the TPMS the vehicle notes the current pressure values and then notifies you when pressures drop to 75%. So if you run 45 PSI and not happy to get notification only when pressure falls to 34 PSI then inflate your tires to 54, reset the TPMS, drive around the block to make sure it takes, then lower pressures back to 45, and should expect notification when they drop to 40 (40/0.75 = 53.3).�
Jul 28, 2015
Ingineer There are 2 receivers in the car, so it probably knows which 2 are on each axle at least.�
Jul 29, 2015
Soolim For Porsche, they read and display each tire's pressure, and gives a warning when any tire is 5 psi less than the others. Simple and effective, and the driver decides what action to take.�
Jul 29, 2015
Matias I had that on my 2008 Dodge Caliber...�
Jul 29, 2015
NigelM My Tesla has it on the center display screen.�
Jul 29, 2015
Soolim You mean tire pressure reading in psi or kPa (not low pressure alarm) on your center display of the Roadster?�
Jul 29, 2015
NigelM PSI and temperatures on each tire. Been there since the car was delivered over 4 years ago.
�
Jul 29, 2015
Soolim Good for you, and for all Roadster owners.
Why is the new MS less than the 4 year old Roadster in terms of user interface is my gripe. Tesla knows that it is useful information, or otherwise they won't include it in Roadster. And as many has echoed the sentiment, many less expensive $30K cars have it, so why not MS.�
Jul 29, 2015
AmpedRealtor Your Tesla is not a Model S.�
Jul 29, 2015
NigelM One of them is.�
Jul 29, 2015
AmpedRealtor I think it's funny that nobody seems to know if the Model S TPMS system can provide independent readings. Seems like if the Roadster could do it years ago, today's Model S should be able to as well.
I suspect we'll get tire pressure readings after we get a decent navigation system.�
Jul 29, 2015
NigelM That was my point; different models but the know-how is there.�
Jul 29, 2015
apacheguy Do the diag screens on a Model S contain TPMS info? If so, how is it presented?�
Jul 29, 2015
tkizzy Has anybody considered that the decision not to provide the numbers is a design decision? I think Tesla want people to have the impression that a Tesla is just this black box of awesome that you plug in to charge and it just works. Maybe seeing the daily fluctuations based on temperature would add one more kind of anxiety besides the "range" kind.
That being said, I want this data (even if as a toggle buried in the settings).�
Jul 29, 2015
apacheguy
Answer is simple IMO: provide us with a read-only access code to the diag screens. That way only folks that bother to look up the code will see the advanced stuff.�
Jul 29, 2015
tkizzy speaking of which: is this community aware of any codes other than "007"?�
Jul 30, 2015
AmpedRealtor Would LOVE to know the service code...�
Jul 30, 2015
mknox Yeah, then TMC would have to open up a whole new discussion forum just for the questions like "I entered this code and now my car won't run. What should I do?"�
Jul 30, 2015
FlasherZ It depends upon the supplier of the TPMS subsystem used. Tesla switched suppliers as well, so you need to consider the old one vs. the new one. I have great faith that the newer subsystem can report it, because it seems to be much smarter than the old one. It does send the specific tire location to the control/management unit. I doubt we'd see that without the capability to get the tire pressures. At that point it becomes a feature element for Tesla's software rather than an issue with subsystem capability.
In the old subsystem, I'm unsure. The threshold tire pressures for alert had to be programmed into the TPMS subsystem itself using the tool, not Tesla's code (I know because in the early days they changed the alert threshold on my car and they had to use the special TPMS tool to do it). That leaves some doubt as to whether the control unit could get those tire pressures. We also know that the TPMS module knows which sensor is on which tire in that unit, but don't know if the CANbus alert messages sends the specific alert or not.
The fact the Roadster had it doesn't necessarily mean that Model S has it. It is likely that the supplier for Model S isn't the same supplier for the Roadster. Did Tesla or Lotus provide the TPMS subsystem? (I'm no expert on what Tesla bought from Lotus - body+chassis only? or did some of the other components come too?)�
Jul 30, 2015
mknox I wonder, though, if this is two different things. My last car had individual tire pressure readouts, but it also had a red "Low Tire Pressure" symbol that would light up if one or more tires got too low. Perhaps even the early Tesla system is sending actual pressures, and then some second system is looking for one or more of the values to go high or low out of band. I can see Tesla having to re-program that parameter.�
Jul 30, 2015
apacheguy Precisely. Which is why it would be read-only. That's all I'm asking for.�
Jul 30, 2015
FlasherZ It could be, although if the old system had the capability of directly reporting pressures, I would expect the Tesla software to take responsibility of generating the alert, rather than having the subsystem do it. It would create much more flexibility than having to make each service tech re-program the subsystem in every car When Tesla decided to change the threshold, they could have developed some simple code to move the pressure alerting to the main supervisor instead. It would save a significant amount of time in the service processes.
I don't have any specific knowledge of the module that they use, I'm just making educated guesses based on the information we do have.�
Jul 30, 2015
apacheguy Pretty sure the MCU generates the alert. I remember in the early days when Model S was in its infancy, one of the software updates decreased the pressure threshold because owners were being alerted too frequently.�
Jul 30, 2015
FlasherZ That wasn't via software update. Unfortunately, that had to be programmed into the TPMS module. That was in the days prior to the St. Louis service center, and when Leo flew out to work on my car he had to use their TPMS tool to reprogram the threshold (I watched him do it). IIRC, they changed it from 38 to 36.5, or from 38.5 to 36... one of the two.�
Jul 30, 2015
apacheguy Ah, I see. So would this be the same scanning tool they would use to determine which sensors are throwing errors? All I know is Tesla was able to identify two specific sensors on mine that were generating errors and only targeted those for replacement. It mentioned on my repair order that they "pulled the logs" which makes me skeptical of this explanation as it indicates the MCU does receive tire specific data from each sensor.�
Jul 30, 2015
FlasherZ Yes, that was the tool they used.
Way back then, I also had 2 sensors bad and he had to use the scanning tool to determine which ones weren't responding. Not sure if "pulled the logs" is a general term they're using for using the scanning tool, or if they added some capabilities.�
Aug 1, 2015
Yonki I just read this entire thread for the first time. From what people have said (essentially "you need to drive the car around to reset the TPMS / get a new result from the TPMS"), it seems to me that the most likely explanation is that the Model S is not measuring the absolute tire pressure of each tire. If they were, I'm certain they would be displaying it (and without having to drive the car to get a new reading). Why wouldn't they?
Instead, it looks like they are using the old, inexpensive (free except for a few lines of code) "TPMS" of comparing the relative RPMs of the 4 tires using the same sensors they use for ABS and traction control. An underinflated tire has a shorter effective radius, so it has to spin faster to cover the same distance. If one tire is consistently spinning at a higher speed relative to the other 3, the car can pretty safely assume that that tire is underinflated. That is why the system won't update until you've driven the car, and how it can tell you the specific tire that has a problem.
People have talked about there being different versions of TPMS in the MS, which makes me less than 100% certain of this conclusion, but possibly they are talking about different versions of the RPM sensors used to implement TPMS, or different TPMS algorithms in the software.
If I'm right, there is no way software can add per-tire, absolute pressure TPMS.
- - - Updated - - -
I forgot to mention that I learned about this type of TPMS the hard way. 10 years ago I parked my old Mitsubishi 3000GT VR-4 Spyder (hardtop convertible - was fun while it lasted!) at a movie theater, where unbeknownst to me a punk who'd tried to steal the parking space I'd been waiting for had put a pebble inside my valve stem then put the cap back on loosely, letting the air leak out of the tire over the next two hours. When the movie was over it was dark, so I got in the car and drove away. A minute later, on the highway doing 65, my tire pressure monitor went off. I pulled off at a gas station and saw that my right front tire was totally flat and I'd been riding on the rim (I'd noticed the car felt a little off as I left, but it wasn't that much, probably because my low-profile tires were already like riding on the rim). Since this was a mechanically-coupled AWD car I had to replace all 4 tires.
So that movie (and if I recall it wasn't even very good) cost me $800 and taught me that no parking space is worth fighting for no matter how late you are...
If I'd had the TPMS my current Acura has I would have known before I moved the car out of park.�
Aug 1, 2015
jerry33 That is not correct. The pressure are on the diagnostic screen and there is a spec for the threshold pressures.�
Aug 1, 2015
Yonki Another theory shot to sh*t... :-(�
Aug 1, 2015
FlasherZ Correct.
As I understand it, most TPMS sensors send updates on pressure changes. On my GM car, for the car to learn which tire is on which axle, you go into TPMS programming mode and the car blinks one of the turn signals. You then either increase or decrease pressure in the corresponding tire until the horn honks, then move to the next wheel.�
Aug 1, 2015
AllenWong Just had a flat tire because of a nail. No warnings given. Was able to still drive with the flat. Very odd. I didn't drive fast or far though.�
Aug 1, 2015
GaryREM I recently had a slow leak because of a nail. Got low pressure alarm.
Leak would take couple of days to get low enough to alarm from full.�
Aug 1, 2015
FlatSix911 I spoke with a Tesla engineer at the local SC station in Mt view this weekend. His car had a pressure testing fixture attached to each wheel and was recording data inside the vehicle. I believe we will get our wish fulfilled soon...
�
Aug 1, 2015
N4HHE Perhaps I wasn't clear. The existing TPMS has to know each tire individually, it just doesn't have to know where each tire is mounted. All aftermarket/retrofit TPMS systems I have seen go to great lengths to minimize the complexity of assigning sensors to locations. Still, its a mess come time to rotate tires.
Each TPMS sensor has a unique serial number. When the TPMS receiver hears a sensor software compares the S/N and if its not one of the 4 registered to the car it is ignored. Can't go running off half-cocked if other cars on the road have low tire pressures.
I remember one of the firmware updates since my December 2013 production listed the ability for the owner to register new TPMS sensors with the car. Just the kind of thing one needs to to to mount snow tires. Previously a visit to the service center was necessary.
- - - Updated - - -
Some years ago the gubmint revised the rule mandating TPMS so that system you describe would no longer pass. If all 4 tires leaked down at the same rate then the RPM comparison would fail to detect. New rule says this condition must be detected. So in effect all vehicles must have in-tire pressure sensors.�
Sep 18, 2015
stopcrazypp Looks tire pressure readings for the 4 wheels are finally introduced in v7.0:
http://electrek.co/2015/09/18/tesla-releases-second-version-of-its-beta-v7-0-software-update-with-autopilot/�
Sep 19, 2015
apacheguy But likely only for the newer VINs.�
Sep 19, 2015
Soolim Thanks. I am glad to hold-off in buying the Fobo gadget. One less thing to maintain or get lost. So long as the rise/fall in tire pressure readings are uniform for all tires and within the expected range, then I am fine. Temperature reading of the Fobo is not much use for me, since I always read the tire pressure the first thing in the morning before beginning my journey.�
Sep 19, 2015
AmpedRealtor Service center can access individual tire pressures for my 2013 pre-AP car, so not sure why it would just apply to the newer VINs. The Roadster, which is much older, also had individual TPMS readouts. I refuse to believe that Tesla gave us a lesser TPMS system than they did for the Roadster! I refuse! lol�
Sep 19, 2015
jerry33 Because it's just a matter of programming, I suspect it just isn't high enough on the list of things to do. It took forever to get the default as "average" instead of "instant" on the Energy screen, and that had to be a one character code change.�
Sep 19, 2015
steve841 Well this low priority item was a real pain in the @ss the other night when I ran over an object and immediately flattened one tire.
Because of the should I had to park, I couldn't visually tell which tire was flat.
I had to kneel down and give each tire a heel push. Not fun in 80+ degrees and 90% humidity topped off with work attire.�
Sep 19, 2015
jerry33 I sympathise, but high priority for Tesla and high priority for Owners are two different things (although perhaps they shouldn't be).�
Sep 20, 2015
ecarfan Yes, this was posted in another thread, and I was quite surprisedI was surprised because in the past there have been many posts saying that individual tire pressures were not possible in the Model S because there was only one antenna reading the tire pressure sensor values. I do not know if that speculation is correct.
So now my question is, are individual pressures only going to be available in the latest cars, or will this new feature be enabled in all Model S?�
Sep 20, 2015
jerry33 There's no technical reason why they couldn't be. The worst case would be the pressures would be shown but the exact position wouldn't be known. That's still many times better than no pressures, even if it's not ideal.�
Sep 20, 2015
FlatSix911 It appears that all 4 tire pressure locations will be displayed.
�
Sep 20, 2015
Ingineer My 70D has two receivers, one in front, one in back. This, especially when combined with accelerometers in the sensors could be used to determine location.�
Sep 20, 2015
CSFTN Not sure why I am different from everyone else. I have a P85D made in March or April 2015; my car will hill hold (for approx 2 seconds) if I firmly depress the brake, and (to the point) yesterday my car told me "Front drivers side tire pressure is low". I am on 6.2.5.71. I first noticed the hill hold abut 6 weeks ago. My front left was in fact 5 psi lower than all the rest of the tires.�
Sep 21, 2015
mknox My 2013 S85 had a lot of early TPMS issues. Tesla replaced the receiver and added what they called an "external antenna kit", but as far as I know, the older cars only have one receiver.�
Sep 21, 2015
AmpedRealtor All cars have this feature. It's called Hill Start Assist. It does not depend on how firmly you press the brake. It depends on the incline of the hill. That's why you only experience the feature in some situations and not others. Tesla's forthcoming Hill Hold feature in v7 will now make this feature predictable and on-demand.�
Sep 21, 2015
mknox Looking forward to that. I seem to live in an area with hills just enough to allow roll-back, but not enough to engage Hill Assist about 80% of the time.�
Sep 21, 2015
smac On a "classic" car without the latest braking hardware I wouldn't be 100% sure you'll get it�
Sep 21, 2015
mknox Well, it does work now using the standard hydraulic brakes, so it seems to me that simply tweaking the software to change when it works is all that'd be required.�
Sep 21, 2015
Tripple_T I'm VIN P031XX...On a significant grade my breaks will hold...how early are you talking about? I didn't realize there was a "new braking hardware". Are we talking the vacuum vs electromechanical? Can you expand why one wouldn't work?�
Sep 21, 2015
smac As I say I wouldn't count on it. Not sure the classic cars had the same level of "brake by wire" tech as the new ones.
I don't know how the old "hill start assist" worked, it could have been electrically holding the motor stationary (effectively stalling it) and not using the braking system at all. (Which would explain why it was fairly time limited in operation)
- - - Updated - - -
This is what the new cars have:
P85D - Electric Mechanical Braking System - Page 8
Obviously far more scope to force the brakes on, sense brake position, scope to program etc. over a dumb vacuum assisted servo hydraulic setup on the classics�
Sep 21, 2015
HankLloydRight We covered this in some other thread -- the hill hold for all cars is brake activated (and not the e-brake either). I suspect all cars will get the enhanced hill-holding features, since it's really just a software modification of what these cars already do.�
Sep 21, 2015
mknox Nope. It uses the standard hydraulic brakes... the same one that are used when you press the pedal. I can hear the exact same squeak/groan from them as they release as I do when I gradually release the brake pedal myself.
The car's ABS and/or Traction Control systems have the ability to apply individual brakes to control skidding, and I believe they are simply employing this mechanism for Hill Assist.�
Sep 21, 2015
FlatSix911 Tesla releases second version of its beta v7.0
�
Sep 22, 2015
mknox Hmmm... so it sounds like "Hill Start Assist" is being replaced with "Hill Hold". Perhaps, as has been suggested, this new "Hill Hold" will require the newer brake hardware. Wonder if older cars like mine will just stay with the current "Hill Start Assist"?�
Sep 22, 2015
Soolim Why would "Hill Hold" require new brake hardware?�
Sep 22, 2015
smac Because hill hold is easy to implement if you have a Bosch iBooster (Mercs with the same unit have the same functionality).
However if you have a traditional vacuum servo it would require fiddling around with the (safety critical) ESP/TCS/ABS sub-systems. Not saying it's impossible, but would it have been a good use of Tesla's time?�
Sep 22, 2015
Soolim Are you implying that not all MS use iBooster? That some MS could be using the traditional vacuum servo? I thought that iBooster complements the EV regen braking and that would be the logical implementation.�
Sep 22, 2015
smac Not implying, stating
Dual Motor Model S and Autopilot | Tesla Motors
�
Sep 22, 2015
mknox I didn't think it would (since it already works now) but others have speculated it might. I just thought with the complete "re-branding" of the function, they might have re-worked the underlying technology.�
Sep 24, 2015
pilotSteve My 2013 Sig S (vin under 1000) had hill hold added with an OTA update and I've had that feature ever since. No reason any MS should not have that feature by now. It can be a bit subtle however, if you worry you don't have it head over to a significant hill and try. Its a nicely implemented feature that is almost "invisible" because it works quite well. It does have a time limitation when it will only hold x seconds (don't know that exact number) so beware if it lets go after an extended hold you may need to engage it again. All this is in the release notes.�
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