Ownership Verified: The wait was long enough: leviathan's Tesla Model 3 Performance

GRtak

Forum Addict
Joined
Sep 6, 2008
Messages
19,020
Location
Michigan USA
With a normal 4WD{modern}, the hubs disconnect from the front axle, which saves all that frictional loss from the driveline. That is not possible with a Tesla, so you still have the driveline loss there, you just aren't driving the motor that drives that axle.

With an old school 4WD, you have to disconnect those front hubs, and if you don't, it sucks the go go juice. In my experience, it was only marginally better than being in 4WD.
 

prizrak

Forum Addict
Joined
Apr 2, 2007
Messages
20,753
Location
No, sleep, till, BROOKLYN
Car(s)
11 Xterra Pro-4x, 12 'stang GT
Yeah I know all that, in theory you could implement that in an EV by having some sort of a clutch to disconnect the actual drivetrain. Though not sure if added complexity would be worth the possible savings.

EDIT: Your experience with 4WD vehicles might also be down to aero vs driveline drag since they tend to be rather boxy.
 

GRtak

Forum Addict
Joined
Sep 6, 2008
Messages
19,020
Location
Michigan USA
It is just as un-aerodynamic whether in 4WD or 2WD. If those front hubs were left locked, it ate fuel.
 

GRtak

Forum Addict
Joined
Sep 6, 2008
Messages
19,020
Location
Michigan USA
2WD with hubs unlocked was the best. Leave the hubs locked and it was basically the same as being in 4WD. My Blazer got about 16 MPG in 2WD, in 4WD that dropped to about 13ish{pavement, or dirt road situation}. In 2WD with the hubs locked it would get 13.25ish... maybe 13.5. Who keeps track off road? lol
 

leviathan

Snores like a puppy
DONOR
Joined
Oct 7, 2007
Messages
2,027
Location
Frankfurt
Car(s)
MX-5 NC, Model 3
That makes me curious, would turning off one of the axles save some energy or would it be a wash because the "disconnected" motor would create "drag" on the wheels?
That's what mine actually does at high speeds - front motor is an async machine that is switched off unless used for acceleration or regen braking, for cruising only rear motor is used as it's more efficient by design. Front motor assembly is still always there as added weight, and the front driveshafts and diff (and the unpowered rotor of the motor) still spin, which costs a tiny but ultimately non-zero amount of energy.
 

NooDle

Ik ben niet alleen lekker met kaas!
Joined
Jul 20, 2005
Messages
9,643
Location
Belgium
Car(s)
VW eGolf, Hyundai Kona 1.0
Consumption on the roadtrip was between 160-170 Wh/km on average, got up to 180 with the highway blast to Ringmeet and the activities there. Lifetime average of the car is 191. It seems I have something of a heavy foot and drive highway rather a lot, which in a BEV increases average consumption noticeably. RWD Model 3s seem to be much more efficient, too - I've seen people quote numbers in the 140-150s for highway driving in the SR+.
Thats awesome consumption/range for a car that size.
My Golf usually is around 130/150 Wh/km but I mainly do either gridlocked highways or B roads where you rarely go over 70 kph.
As soon as I hit a highway at highway speed (120, because 130 kills my range) I'm around 180 Wh/km.
Mine does 156 kph topspeed but I havent driven that long enough to determine the range at that speed. I'm told 100 kms max (which is less than half what it is with normal speeds)
 

leviathan

Snores like a puppy
DONOR
Joined
Oct 7, 2007
Messages
2,027
Location
Frankfurt
Car(s)
MX-5 NC, Model 3
Oh, top speed. I finally got to verify that the car was unlocked after spoiler installation yesterday. It was limited to 234 km/h before, now it happily climbed to 262 on an empty Autobahn straight:

3556220


Note the rated range drop to shit immediately as I start accelerating properly at ~22:46:20 :)

Also a thing I found interesting, you can absolutely see in the graphs that the motors lose/limit power at high RPMs - it didn't go above ~330kW on that highway blast, and steadily decreased as the car picked up speed (~22:46:40-22:47:00), before actually dropping a notch to maintain 262, despite me keeping the foot hard down all the way. Peak power at 393kW was delivered later in the drive, when I accelerated from a 90° right turn onto a local road.
 

Matt2000

Disco Stu-pour
DONOR
Joined
Feb 17, 2006
Messages
14,588
Location
Country smells, England
Car(s)
'01 Disco 2 V8, '90 Disco 1, '05 Smart Roadster
I don't usually like graphs but damn, those are nice graphs. I heard that the price of the Model 3 in this country increased by a few thousand this week, don't know if that's demand or something else but they seem to be selling well.
 
Top