phw1961
Posts: 1
Joined: Mon Aug 17, 2020 11:27 pm

Noise from range extender

Mon Aug 17, 2020 11:34 pm

I recently purchased a 3 year old i3 and so far, I am very pleased. However, when I drive using the range extender I can hear a significant amount of noise coming from the rear of the car both during driving and for a short while after stopping/parking. Is this normal? All other aspects of driving this car is so quiet, so the noise I hear is a little unexpected.

User avatar
MKH
Gold Member
Posts: 667
Joined: Fri Nov 02, 2018 5:48 am
Location: Dallas

Re: Noise from range extender

Tue Aug 18, 2020 3:54 am

It's a 650 cc gas powered BMW scooter engine - it makes noise. Louder outside the car, than inside - but you do hear it.

https://www.youtube.com/watch?v=zCJpmrhQPsU

https://www.youtube.com/watch?v=arD_Cq_f6Fw
Mark H.
2015 i3 Rex, Capparis White, Tera World, Technology & Driving Assistant, Parking Assistant, Harman Kardon Audio System, 19 inch 427 wheels, EVoInnovate EVSE

JohnWasser
Posts: 68
Joined: Sat Mar 07, 2020 6:15 pm

Re: Noise from range extender

Tue Aug 18, 2020 8:03 am

I can only hear my REX at very low speeds and even then I don't find the noise objectionable. Maybe there is something wrong with your exhaust system. Or maybe my hearing is bad. :)

The noise might not be from the REX engine but from the cooling fan. The engine is supposed to stop at low speeds but, in my experience, the fan will continue for some time after stopping. If the fan is out of balance that would make the noise worse.

I have a button set for the Hold-SoC feature so I can turn it on and off easily. Maybe it would help to turn off the Hold when you are in town and likely to be stopping often.

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