BMW i3 On The Dyno – Video


BMW i3 On the Dyno

BMW i3 On the Dyno

“Putting the i3 on the dyno for the fun of it.”

States the video description.

The BMW i3 is rated at 170 HP, but this dyno run shows that the i3 puts out quite a bit more power than BMW’s official figures suggest.

Dyno Results

Dyno Results

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15 Comments on "BMW i3 On The Dyno – Video"

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And that’s power to the wheels. I’m not sure of the power loss with an electric drive train, but typically with ICE cars, the wheel HP is roughly 15% less than the engine HP. So that means the i3 has about 214hp equivalent for an ICE car.

The curve does not look anything like I would expect. The red and blue lines appear to be on top of each other (hp and torque) and they shouldn’t be the same. I would expect a torque plot to be much flatter, with an electronically controlled ramp-up in power and the corresponding fall off as motor speed increases.

Nevermind, it looks like they did not measure torque.

Why no torque figures?

Torque is harder to calculate without the RPM pickup that is normally taken off a sparkplug wire

You should be able to take the torque off of the dyno, regardless of whether it is an electric car, gas car, or an unusually strong gerbil.

Torque is calcuated from power, but it’s not possible to calculate it without knowing the drive ratio or measuring the rpm.

I find it humorous that they have the big cooling fans running, like they do for an ICE vehicle.


Too bad they didn’t measure it with fully depleted battery. I would find those readings far more interesting.

Or how about no gas and a depleted battery. Wouldn’t that be so amazingly interesting?

a Dyno can only measure torque. it can not measure power-output. Power is a function of the torque applied to the rollers, and at what RPM that torque is applied. Power readings are always calculated values. Torque is what the sensors on the Dyno measures.

The dyno measures torque at the roller and combined with the speed and mass of the rollers that tells them wheel torque and wheel power. Conventional dyno readings take the wheel torque and divide it by the gear ratios to give a calculated crank torque.

Unlike most American and Japanese manufacturers….the Germans tend to underrate the horsepower and 0-60 times of many of their performance cars. 0-60 on the i3 is rated at 7.1 seconds, and the i8 in the low 4’s . But instead the i3 tests at around 6.5 seconds and the i8 around 3.8 seconds.

I can confirm Edmunds test lab found the i3 BEV to reach 0-60 in 6.5