So, after removing the rear seats from my E30 I can hear a very loud whine from the rear of the car. It sounds like this at 70 mph. Here's a frequency spectra of that same noise.
Looks like the offending sound is about 6.5 KHz. Filtering out all the road noise etc. and you are left with this.
Things I have determined:
1. Noise does not change when I press or lift the gas, no matter what gear
2. Noise does not change if I turn the steering wheel
3. Noise does not change if I step on the brakes
4. Seems to be 100% speed dependent. Higher the speed, louder and higher frequency the whine
5. Changed my LSD diff fluid with 75-W140 Valvoline synthetic. No change
Anyone out there with ideas?
Thanks
Looks like the offending sound is about 6.5 KHz. Filtering out all the road noise etc. and you are left with this.
Things I have determined:
1. Noise does not change when I press or lift the gas, no matter what gear
2. Noise does not change if I turn the steering wheel
3. Noise does not change if I step on the brakes
4. Seems to be 100% speed dependent. Higher the speed, louder and higher frequency the whine
5. Changed my LSD diff fluid with 75-W140 Valvoline synthetic. No change
Anyone out there with ideas?
Thanks
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