# Video: Autocar Straps a Tesla Model S to the Dyno

SEP 24 2013 BY ERIC LOVEDAY 13

There’s not much to add to how *Autocar* describes this video, so we’ll keep it short and sweet.

The tested Tesla Model S P85 is claimed to put out 416 horsepower, but something magical must happen when it’s strapped to a dyno, as you’ll see in the results posted in this video:

Here’s *Autocar’s* description:

“Having already declared the Tesla Model S as a landmark car, the time comes to see just how much power those motors and batteries produce. Will it be enough to shame some of the world’s most exotic sports cars and supersaloons? Steve Sutcliffe takes a Model S to a rolling road to see how much bhp is generated on the dyno.”

**Categories:** Tesla

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13 Comments on "Video: Autocar Straps a Tesla Model S to the Dyno"

Shocking!

Where is the torque curve; at what rpm is max torque? what s the max torque? It would also be interesting to know at what rpm the motor draws max current and what is that current?

Why are you keeping this a secret?

Dear Lad,

FYI, there is no RPM in electric cars… Nothing to “round”. Just pure current running to the wheels.

Actually there is.

Power curve in the photo looks quite linear with speed, implying the torque curve is quite flat. But I agree, it’d be great to see the ACTUAL torque curve.

Induction motors in variable speed applications controlled by variable frequency drives (such as EV motor controllers) usually are essentially constant torque across the speed range. Torque is proportional to the current provided (the windings can only handle so much current, so the power electronics limits current), rotational speed is proportional to the frequency, and voltage is also ramped up linearly with frequency (except at very low speeds).

It is interesting to read the comments; I don’t know where to start with the no rpm comment other than to say that the power curve is a calculated value that depends on the rpm and torque In fact the torque at any point on the HP curve can be calculated by 5252 x HP/RPM. Most Dynos read torque directly and plot it; the HP curve is then calculated and plotted. Regarding the torque curve: most electric motor torque curves are flat at max torque from zero rpm until the so called knee and there they start dropping. The Nissan Leaf torque curve is about 200 ft/lbs from zero out to about 3,000 rpm and then drops to about 30 ft lbs at the high rpm limit.

The Model S is the exact same torque curve as the LEAF (just scaled up) for the reason HVACman mentioned above (current limit of the windings). Torque/Power curves will never be as interesting with EVs as they were with ICEs.

Torque is very misleading in EVs. Should only compare torque at the wheel. Gm misleads with the spark. Gm proclaims high torque but it goes through a low reduction gear while the Leaf has half the torque but much greater reduction gear. End result is that torque at the wheel is about the same. It’s like comparing the torque you get from one car in 1st gear vs the torque in a different car in 3rd gear. Not comparable.

And yet the Spark is ~3 seconds quicker 0-60.

Amazed when folks confuse kW and kwh. It’s not a 85kw motor, it’s a 85 kwh battery. It’s like asking how powerful a car is and answer with 10 gallons. It’s a 310 kW motor.

Amen. This drives me nuts also.

GSP

Hello,

“Surprised by This Result?” Yeap Sir!!!

Waouwwwwwwww ready to take off!!!!!!!!!!!!!!

AWESOME

Go TESLA

Good road with Tesla!!!!!!!