Model 3 slips forward when going up to parking lot

[shahryaran]

Whenever I enter a parking lot that has an entrance with a slope that goes up, the car jerks/slips forward suddenly as soon as the front left tire enters the slope. Here is a photo of one of the parking lot.

Is it the regen or traction control trying to do something?

 

[afadeev]

Whenever I enter a parking lot that has an entrance with a slope that goes up, the car jerks/slips forward suddenly

What does "jacks/slips forward" mean ?
You are driving up a driveway, should the car not continue moving FWD?

Is it the regen or traction control trying to do something?

Do you break before the turn, then accelerate through it?
Break into it?
Break into it, then accelerate.

Whatever it is, don't worry about it, as long as it gets you to your destination.
If it gets you there too slowly - go faster.
Too fast - go slower.

HTH,
a

 

[shahryaran]

What does "jacks/slips forward" mean ?
You are driving up a driveway, should the car not continue moving FWD?



Do you break before the turn, then accelerate through it?
Break into it?
Break into it, then accelerate.

Whatever it is, don't worry about it, as long as it gets you to your destination.
If it gets you there too slowly - go faster.
Too fast - go slower.

HTH,
a

It suddenly jumps forward then the car goes normal. It's for a just a slight moment only.

 

[afadeev]

It suddenly jumps forward then the car goes normal. It's for a just a slight moment only.

Jumps == leaps into the air, all 4 wheels of the ground? Just 2?
Like below?

Or what?

 

[shahryaran]

Jumps == leaps into the air, all 4 wheels of the ground?
Or what?

Whatever

 

[RayK]

Whenever I enter a parking lot that has an entrance with a slope that goes up, the car jerks/slips forward suddenly as soon as the front left tire enters the slope. Here is a photo of one of the parking lot.

Is it the regen or traction control trying to do something?

I would say it's not regen. It may have something to do with AWD and/or traction control. As I understand it, you experience this "slip" when making a right turn into such a driveway. What happens if you enter from the opposite direction (i.e, a left turn into the driveway), where your front tires are hitting the sidewalk / driveway relatively straight on?

I have a RWD and have never noticed any strange behavior when driving into a parking lot with a sloped entrance. The only times something feels wrong is when the right rear tire hits the corner of the sidewalk / entrance as shown in your photo.

 

[RayK]

Do you break before the turn, then accelerate through it?
Break into it?
Break into it, then accelerate.

It's "brake".

 

[shahryaran]

I would say it's not regen. It may have something to do with AWD and/or traction control. As I understand it, you experience this "slip" when making a right turn into such a driveway. What happens if you enter from the opposite direction (i.e, a left turn into the driveway), where your front tires are hitting the sidewalk / driveway relatively straight on?

I have a RWD and have never noticed any strange behavior when driving into a parking lot with a sloped entrance. The only times something feels wrong is when the right rear tire hits the corner of the sidewalk / entrance as shown in your photo.

I was thinking maybe it's my foot hitting the pedal slightly as the result of the car bumping into the driveway

 

[shahryaran]

I would say it's not regen. It may have something to do with AWD and/or traction control. As I understand it, you experience this "slip" when making a right turn into such a driveway. What happens if you enter from the opposite direction (i.e, a left turn into the driveway), where your front tires are hitting the sidewalk / driveway relatively straight on?

I have a RWD and have never noticed any strange behavior when driving into a parking lot with a sloped entrance. The only times something feels wrong is when the right rear tire hits the corner of the sidewalk / entrance as shown in your photo.

This doesn't happen if the driveway entrance doesn't have a slope

 

[RayK]

Try a straight in approach on a driveway where you have the slip turning into it. Also check the tread on the left front tire to see if it's worn too much.

 

[shahryaran]

Try a straight in approach on a driveway where you have the slip turning into it. Also check the tread on the left front tire to see if it's worn too much.

Tires are new

 

[RayK]

Brand new? And your car has never done this before? Maybe they left the sticker on the tread of the tire??? Had that happen to me way back when. I didn't notice until about two days later. Nothing that I could feel in the car but then again it was on a '71 Capri.

 

[Gauss Guzzler]

The front wheels follow two different paths when turning and the steering linkage geometry attempts to match the angles fairly well, but it's entirely impractical to match them perfectly throughout the entire range so all cars will have some amount of skidding in tight turns. The resulting skidding/jumping varies by car/tire/suspension/terrain and is often most noticeable when something like a driveway reduces the load on one wheel just as discontinuities in the roadway reduce traction.

What you are sensing is likely just a little bit of lateral tire scrubbing that is different than other cars due to the Tesla's geometry/suspension/tires.

 

[rpiotro]

It's "brake".

Maybe he meant break? Like crash through the gate or something.

 

[rpiotro]

The front wheels follow two different paths when turning and the steering linkage geometry attempts to match the angles fairly well, but it's entirely impractical to match them perfectly throughout the entire range so all cars will have some amount of skidding in tight turns. The resulting skidding/jumping varies by car/tire/suspension/terrain and is often most noticeable when something like a driveway reduces the load on one wheel just as discontinuities in the roadway reduce traction.

What you are sensing is likely just a little bit of lateral tire scrubbing that is different than other cars due to the Tesla's geometry/suspension/tires.


View attachment 969708

Yes, this! For example, my wife's Mercedes SLK 350 (R172) chugs and chatters when backing up with the wheel hard over. When she exits the driveway. It is a lot worse with the UHP Michelin Pilot Super Sports than with the winter tires.

Maybe what the OP is experiencing.

 

[shahryaran]

The front wheels follow two different paths when turning and the steering linkage geometry attempts to match the angles fairly well, but it's entirely impractical to match them perfectly throughout the entire range so all cars will have some amount of skidding in tight turns. The resulting skidding/jumping varies by car/tire/suspension/terrain and is often most noticeable when something like a driveway reduces the load on one wheel just as discontinuities in the roadway reduce traction.

What you are sensing is likely just a little bit of lateral tire scrubbing that is different than other cars due to the Tesla's geometry/suspension/tires.


View attachment 969708

True. But what about a driveway that doesn't have a slope. It doesn't happen with no slope

 

[zoomer0056]

Is it the regen

Definitely not regen. Regen will not slip or jump. It slows the car.

 

[MP3Mike]

Definitely not regen. Regen will not slip or jump. It slows the car.

Traction control can reduce regen which can make it feel like it is accelerating. (When it is just decelerating less.)

 

[zoomer0056]

Traction control can reduce regen which can make it feel like it is accelerating. (When it is just decelerating less.)

That's a good explanation.

 

[jkdman123]

True. But what about a driveway that doesn't have a slope. It doesn't happen with no slope

I believe a slope would exacerbate the issue Gauss Guzzler illustrated when one of the front tires hits the slope before the other one. One front wheel is taking that much of a different path than the other.