Top speed in reverse?

Top speed in reverse?

Any information about how fast Model S can go in reverse? Given there are no gears, it seems like Model S should be able to go as fast backwards as forwards. I expect Tesla has set a limit on the reverse speed. George Blankenship's recent blog that top speed will be limited on test drives suggests that top speed is a function of software, not hardware. Any insight from the more technically inclined?l

BYT | June 30, 2012

The limit GB put on speed it on the honor system I thought?

olanmills | June 30, 2012

Well even the production version of the car has the top speed limited to protect the battery and other drivetrain components. I assumed that they just tuned it down to 75 mph on the test drive cars.

Capt601 | June 30, 2012

The standard car I drove today actually stopped accelerating at 80 and would not go any faster. Copilot said it was computer limited to 80 for the event.

BYT | June 30, 2012

Interesting! Can I set that for my kids 10 years down the road when I lend the car to my offspring.

Capt601 | June 30, 2012

Yes indeed. I think my wife would love to be able to set it low for me when she is riding with me.

mdennick | July 1, 2012

+1 Capt601. My wife would love that too. ;-)

Brian H | July 1, 2012

As I noted on another thread: probably Tesla piled up a shocking # of tickets at Fremont to pass on (in process/the mail), and wanted to pre-empt the same thing happening in LA.

digitaltim | July 1, 2012

Real Parental Controls on the car...who would have thunk it...

Thumper | July 1, 2012

My wife enjoys using her drag brake on our tandem bike.

Timo | July 1, 2012

I have vague memory that reverse was limited to 25mph. That's still quite fast for reverse, but not too fast.

stephen.kamichik | July 1, 2012

I thought it was limited to 15 mph.

BYT | July 1, 2012

I hope it's more like 25 for those times I need to back into a spot on a clear road before the light turns green in reverse for that parking spot that just freed up! I have to be really comfortable with my rear field of view for me to pull that off however!

toto_48313 | July 1, 2012

As the computer can limit the speed, that will be great to have about 5 "preset" speed limits that could be change anytime.
This will allow for example to put your limiter at "city" mph when driving in town, so the computer make sure your are not overspeeding anytime. As the acceleration is quick, I don't want to spend my time watch the speedometer.

BYT | July 1, 2012

Or to build on that, like my GPS can display the posted speed limit of the road I'm traveling on, getting some sort of indicator when I am 5 miles or more above that limit? Maybe this would make more sense to post under apps however?

Robert22 | July 1, 2012

I'm sure the speed in reverse is limited. No one wants grandma to accidentally step hard on the wrong pedal and go from 0-60 mph in 4.4 seconds backwards at the local Stop and Shop.

jerry3 | July 1, 2012

There should probably be a reverse beep. The reverse beep in the Prius has saved me on a few occasions.

Brian H | July 1, 2012

Probably the "R" button should flash on-off while in reverse, too. But it's hard to make things proof against the ingenuity of fools, sez Dr. Murphy!!


Theresa | July 2, 2012

I own a Roadster and reverse is limited to 15 mph so I would expect the same for the Model S

Supergreekster | July 2, 2012

I think speed could be limited to "speed limit" (data from nav). Or +5. Or +7. Etc.

toto_48313 | July 2, 2012

I agree Supergreekster.

The system should allow the driver to "apply speed limit" + a user define delta speed.

If you don;t want the limiter, you can disable it, but it could be usefull.

Timo | July 3, 2012

GPS-based speed limit data is not 100% accurate. I would not want car to accelerate to 100km/h into middle of road construction. Or speed accidentally because nav tells that speed limit is something else than it is.

Also passing other car that is going close but not quite at speed limit speed is safer if you can "speed" a little more than just 7 mph.

When car can actually read road signs and tell speed limit based on that, then I accept car adjusting speed accordingly, not before.

I think people are already trying to move a bit too much driving from driver to the car. I rather drive myself than sit into taxi that just happens to have passenger seat in place of drivers seat. Automatic emergency safety systems are OK but Model S is drivers car, not a limo with a driver.

Brian H | July 3, 2012

Yes, an enhanced driving experience does not mean less hands-on; rather the opposite, in some ways. Interesting that Utopian city planners are much in love with the idea of convoys of robo-cars moving people like packages.

Volker.Berlin | July 3, 2012

Are we still talking about reverse gear speed? Just wondering...

Timo | July 3, 2012

Looks like not. Nature of non-moderated forums, discussion often wanders off topic.

Volker.Berlin | July 3, 2012

Timo, yeah, I'm familiar with the concept. It's just that in this instance, it's particularly irritating. Limiting reverse gear to the speed limit? Are you serious?? ;-)

Volker.Berlin | July 3, 2012

With regard to top speed/forward gear and speed limits, I have two remarks:

- The MB cruise control has always known two modes: Traditional cruise control, keeping your car at a preset speed while your foot is off the accelerator, and "Limit" mode, where the computer does not accelerate your car but keeps you from accidentally exceeding a preset speed limit. Since Tesla is using the Mercedes stalks, I think they might also mimic the Mercedes function. Personally, I very rarely use the "Limit" mode.

- All sat nav systems I have used recently (rental cars, mobile phone apps, PNAs) literally tell you when you are exceeding the speed limit that they have in their maps. This is of course wrong in some occasions (see Timo's post above), but it's actually helpful more often than not. Of course it can be configured (+10 etc.) and can also be turned off altogether. For me, it's all I need, I usually don't want the computer to actually limit my top speed at the accelerator level.

BYT | July 3, 2012

I don't want anything limited computer or otherwise! I don't mind speed limit notifications as long as they are reference purposes ONLY!

pilotSteve | July 3, 2012

I couldn't help but smile a remembering the old 1977 movie "Smokey and the Bandit" where Bert Reynolds drives his Camero (not sure car he had) about 80 MPH in reverse! The cop wanted to nail him for something, and could only come up with "reckless backing"!

Timo | July 3, 2012

I think that was Firebird. Trivia: Burt Reynolds drove himself in all but the most dangerous stunts. Film was low budget one, so minimal crew and no fancy Hollywood trickery, when you see car going fast it is really going fast. When tricks were used they were really easy to spot (just plain fast forwarding film in some places).

Much like original Cannonball films, when you see that Lamborghini Countach accelerate past cop car in opening scene you can tell that it is really accelerating, and that is not a trick.

Going backward as fast as those old US muscle cars could go is dangerous. There is a reason why the steering wheels are in the front and not in the back.

Brian H | July 4, 2012

Next (muscle car) level: multiple reverse gears!? /8-O

The Mod-S would have to be electronically limited; neither motor nor reduction gear care which way they're rotating. I suppose the reduction ratio is greater for reverse, though.

bsimoes | July 4, 2012

I just watched a video of a test drive where the co-pilot commented that the backup camera comes on automatically when the car is put in reverse and that you can have it on when going forward as well. Never having had one, I was intrigued that it came on once the car was put in reverse, and thought that others might be as well.

jerry3 | July 4, 2012

All cars that have a reverse camera have it activated by putting the car in reverse--at least I don't know of any exceptions. Having it being able to be used when the car is going forward is not common.

BYT | July 4, 2012

Does regen also work in reverse?

jerry3 | July 4, 2012

No reason why it shouldn't, but at the speeds you typically go in reverse, there won't be much kinetic energy to capture.

Timo | July 4, 2012

IIRC Roadster and Model S just turn engine in opposite direction in reverse. There is no "reverse gear" in gearbox.

Brian H | July 5, 2012

Which would mean reverse is limited in speed only electronically.