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When power limiting is normal?

Acho

Member
Mar 28, 2017
381
389
Las Vegas, NV
Hi all,

I observed power restriction on my 42k miles 12.2014 S85 with abot 65-70% charge and ~80F outside temp after 25-30 miles drive on freeway at speed of 70 MPH. Before the drive the car was charged to 80% in about 70F garage and the charge was completed nore than 6 hours before the drive. At full throttle it accelerates with max power showed on das to be at 300 KW from speed ot about 55 mph. At speed of about 80-85 the yellow warning sign appears on the power dial and shortly dashed line was displayed rapidly limiting/decreasing power / i can see it literally pushing back the green arch/.

Is this normal or I have a problem?

Thanks
 

whitex

Well-Known Member
Sep 30, 2015
6,617
7,946
Seattle area, WA
Hi all,

I observed power restriction on my 42k miles 12.2014 S85 with abot 65-70% charge and ~80F outside temp after 25-30 miles drive on freeway at speed of 70 MPH. Before the drive the car was charged to 80% in about 70F garage and the charge was completed nore than 6 hours before the drive. At full throttle it accelerates with max power showed on das to be at 300 KW from speed ot about 55 mph. At speed of about 80-85 the yellow warning sign appears on the power dial and shortly dashed line was displayed rapidly limiting/decreasing power / i can see it literally pushing back the green arch/.

Is this normal or I have a problem?

Thanks
"pushing back the green arch" so you mean regen power limit, not acceleration limit? How long does this restriction last?
 

whitex

Well-Known Member
Sep 30, 2015
6,617
7,946
Seattle area, WA
My bad, not green but orange - actively reducing power. The regen is unrestricted
For new seconds or for a long time? Few seconds can happen from time to time, for a long time the battery may be overheating, With 80F outside it may happen if you drive 70mph uphill. One this I would check is whether the front louvers/vents are opening ok and are unobstructed. Usually they open briefly when first plugged in to any charger. When supercharging fast they open and stay open while the fans are going (you can hear them).
 

Acho

Member
Mar 28, 2017
381
389
Las Vegas, NV
I didn't want to risk my driver's license and tested it for like 10 seconds but the power wa getting lower since it first started to restrict it. I will try to film it
 

whitex

Well-Known Member
Sep 30, 2015
6,617
7,946
Seattle area, WA
I didn't want to risk my driver's license and tested it for like 10 seconds but the power wa getting lower since it first started to restrict it. I will try to film it
It could be overheating. Btw, on a track the car will do that no matter what. I've experienced temporary limits when driving through the mountains in a "spirited" fashion at 50F or 60F.
 

Acho

Member
Mar 28, 2017
381
389
Las Vegas, NV
It could be overheating. Btw, on a track the car will do that no matter what. I've experienced temporary limits when driving through the mountains in a "spirited" fashion at 50F or 60F.
In the winter the battery is cold and the power is restricted. In the summer the battery is hot and the power is restricted. I am confused ;)
 

whitex

Well-Known Member
Sep 30, 2015
6,617
7,946
Seattle area, WA
In the winter the battery is cold and the power is restricted. In the summer the battery is hot and the power is restricted. I am confused ;)
No different than you, when you're freezing you risk hypothermia, when it's too hot, you risk heat exhaustion or stroke. For most things on this earth, there is usually an optimum temperature for optimum performance. :)
 
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Acho

Member
Mar 28, 2017
381
389
Las Vegas, NV
No different than you, when you're freezing you risk hypothermia, when it's too hot, you risk heat exhaustion or stroke. For most things on this earth, there is usually an optimum temperature for optimum performance. :)
That's why car has temperature management system
 

whitex

Well-Known Member
Sep 30, 2015
6,617
7,946
Seattle area, WA
That's why car has temperature management system
So does your body (sweating, shivering, heat generation, panting, etc) ;) Like every system it's not instantaneous and it has limits. It is well known Tesla's don't do well on race tracks after a lap or two. It gets worse if the thermal management is impeded like the louvers not opening of being plugged with leaves or other stuff, hence my suggestion to check them.
 
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Don TLR

Active Member
Jul 27, 2017
1,424
4,939
Apache Junction AZ
Similar thing has repeatedly happened to me recently. It's happened early in the AM and mostly when its warm and I'v had some spirited driving and roll on stints. I get the decreased power and the more it heats the less power I get and eventually limits me at any speed.
IMG_2731.jpg
 

ngng

Member
Jul 23, 2018
903
427
Bay Area
disappointing to hear about the power limiting. i drive quite a bit up and over our local mountain (hwy 17/9/34) and would be super annoyed if it happened often :(
 

SSonnentag

Rocket Scientist
Apr 11, 2017
1,739
2,188
Arizona
When it's 110+ degrees outside I can only do a couple of hard runs before getting limited power. It goes away after only a minute or so though, so you can hit it again. :)
 

Don TLR

Active Member
Jul 27, 2017
1,424
4,939
Apache Junction AZ
Lots of full throttle runs,, consecutive. I ran a few mountain roads that I used to drag a knee on riding two wheels and had no problem at speed. It only happens when I'm really hard on the car.
 
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ngng

Member
Jul 23, 2018
903
427
Bay Area
Lots of full throttle runs,, consecutive. I ran a few mountain roads that I used to drag a knee on riding two wheels and had no problem at speed. It only happens when I'm really hard on the car.

thanks for the info. sounds like I need to rent a S and do some mt runs
 
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