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Reduced regen with lateral g's

AltLogic

Member
May 14, 2018
252
328
SoCal
I drove my Model 3 down my local windy mountain road. My plan was to use regenerative braking entering the sweeping curves and regenerative and friction braking for the sharp turns. I noticed that when I turned the wheel the regenerative braking was reduced. As soon as I straightened the wheel the regenerative braking would resume at full regeneration. It was a little surprising the first time it happened. I have driven my Model 3 up the same road a couple of times and it was a blast. I haven't seen anyone else report this behavior. Fortunately, the increase and decrease in regeneration was smooth.

Also, it appears the programers are a little overprotective with cruise control too. When I am enter the freeway onramp at the speed limit followed by increasing the set speed for cruise control the car will not accelerate till I am going almost straight.
 

animorph

Active Member
Apr 1, 2016
2,164
1,586
Scottsdale, AZ
Not something I've seen with the X. It is possible that changes in your speed caused the differences in regen, it does vary with speed as you slow down during a normal straight-line stop.

Was that basic "cruise control" or Autopilot traffic aware cruise control (TACC)?
 

AltLogic

Member
May 14, 2018
252
328
SoCal
My Model 3 doesn’t have EAP/TACC/Autopilot.

It was very obvious on corner exit. While in the turn there was very little if any deceleration. As soon as the steering wheel was close to straight there was an increase in deceleration. It was like: this is cool I am driving 45 mph around this downhill sweeper and everything is steady state fun, straighten up the steering wheel and now I am slowing down when I want to maintain speed. Next curve comes up and I want to enter it at 35 while letting the regen trail brake for me, as I enter the regen goes away and I have to press the brake pedal lightly on corner entry, coast without regen to mid corner and hopefully remember to ease on the accelerator to continue “coasting” when I straighten out.

This is well below the limit driving on a fun road. If I was on a track I wouldn’t notice it since I would enter the turn with the friction brakes and exit with lots of accelerator pedal application.
 

swaltner

Active Member
Oct 13, 2012
1,651
1,707
Kansas, USA
I’d repeat the setup and have a passenger along keeping an eye on the power meter shown below the speedometer on the center display. This would tell you for certain that it’s adjusting the amount (kW) of regen and not something else coming into play. I’m not doubting you, just sounds like an odd correlation to have.

Maybe traction control is coming into play and trying to limit the braking to keep from entering a skid. Just spitballing at the underlying reason...
 

goto10

Member
Mar 6, 2018
182
241
Provo, UT
I haven't noticed regen strength to be dependent on steering wheel position.

I've found that the "strength" of the regen varies with speed. If I'm going 80 and lift off the accelerator I feel relatively little slowing. If I'm going 40 and do the same thing the effect is much stronger. It it possible that you are noticing these speed-related differences in regen coincidentally with how you are entering and exiting turns, which will tend to occur at different speeds? Perhaps you were entering the sweet spot for regen when you were exiting turns and straightening the wheels?
 

bxr140

Active Member
Nov 18, 2014
3,052
4,916
Bay Area
Same thing happens on RWD S’es too. Having all your braking at the rear of the car with high lateral load is a recipie for disaster. By turning off regen you’re forced to use the actual brakes, which more proportionally loads the car.

You shouldn’t be braking that deep into a corner anyway. ;)

***I live at the top of a hill.
 
  • Informative
Reactions: DR61 and favo

favo

P3D+ owner
Apr 5, 2012
1,077
1,236
Durham, NC
Same thing happens on RWD S’es too. Having all your braking at the rear of the car with high lateral load is a recipie for disaster. By turning off regen you’re forced to use the actual brakes, which more proportionally loads the car.

You shouldn’t be braking that deep into a corner anyway. ;)

***I live at the top of a hill.
Presumably dual motor/perfomance versions keep more regen in the corners.
 

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