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Hum from front motor?

TimberM3

New Member
Oct 30, 2019
3
0
Raleigh, NC
Is it normal to have a humming noise from the front of the car under fairly hard acceleration? I have a 2019 LR AWD, and I started noticing this after the first 2021 update. I'm not sure if that caused it or if it's just a coincidence. This is not the motor whine that's always been there, but a low pitched humming noise. I'm thinking it's from the front motor which only kicks in during fairly hard acceleration. Everything else seems fine, the car accelerates like it always has.
 

pt19713

Member
Feb 5, 2020
777
954
Delaware
I'm thinking it's from the front motor which only kicks in during fairly hard acceleration. Everything else seems fine, the car accelerates like it always has.
Yes, it's normal. The car is primarily 100% RWD unless the rear loses traction and/or you get a little more spirited with the accelerator pedal.

This is a datalog of a 33 minute drive. Speeds were kept under 65 mph, mostly around 55 mph.
The teal is the torque from the rear motor, the pink is the torque from the front motor. The blue is accelerator percentage. As you can see, the front motors barely kicked in. They activated 15 times, of which 12 were barely a blip. The three times were they provided a small amount of torque was when the accelerator pedal was at around 40-50%. Under most efficient driving conditions, the front motor won't be active unless the throttle is around 20-30% minimum.

1617911328397.png
 
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GtiMart

Member
Nov 13, 2019
665
538
Quebec City, Canada
I can hear two separate "whines" or "current noise" in my car. A hard acceleration produces one. I'm under the impression that shoving 300kW of power into converters and motors produces a bit of acceptable noise :)

The other case is when my car is preheating when going to a supercharger. The motors seem to produce a louder noise, even when doing regen. Both seem normal to me.
 

MikeyC

Member
Aug 19, 2019
142
298
Florida
I've owned two EVs before the Model 3 and they each make their own symphony of noises. I don't even pay attention unless I see an error message, smell smoke, or see flames. :D

Mike
 
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