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Author Topic: Hissing sound from round display  (Read 10255 times)

Offline tweak

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Hissing sound from round display
« on: May 10, 2010, 03:10:46 am »
Altough it's not a big problem, i still would like to find out why my round display is making a strange hissing sound when turned on. It's most noticeable at startup, the sound is like a  high frequency hissing going up and down. It's connected directly to it's own lambda and EGT, i think it could be related to this somehow, maybe bad wiring?
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Offline rob@vems.co.uk

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Re: Hissing sound from round display
« Reply #1 on: May 10, 2010, 03:22:32 am »
Its a feature, high frequency modulation of the heater.
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Offline tweak

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Re: Hissing sound from round display
« Reply #2 on: June 19, 2010, 05:36:45 am »
OK, thanks. But is the heater supposed to be on while the engine is hot as well?
I'm a bit of a newbie to this, so i don't understand the need to heat the O2 sensor in a worm exhaustpipe.
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Offline rob@vems.co.uk

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Re: Hissing sound from round display
« Reply #3 on: June 20, 2010, 09:51:28 am »
As I understand things they have to correlate the heater's temperature/resistance reading with the reading from the Nernst cell, so its driven and read all of the time that the sensor is operating.
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Offline tweak

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Re: Hissing sound from round display
« Reply #4 on: February 26, 2011, 02:20:25 pm »
The Hissing sound actually disappeared after upgrading the firmware. I hope the instrument is still ok as i have nothing to compare with i don't know if its normal or not.
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Offline jrussell

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Re: Hissing sound from round display
« Reply #5 on: February 26, 2011, 06:42:04 pm »
The frequency was changed in the latest firmwares to reduce noise due to the complaints. Nothing is wrong, it's expected.
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Offline NOTORIOUS VR

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Re: Hissing sound from round display
« Reply #6 on: June 14, 2011, 04:32:45 pm »
Quote from: jrussell on February 26, 2011, 06:42:04 pm
The frequency was changed in the latest firmwares to reduce noise due to the complaints. Nothing is wrong, it's expected.

the hissing is annoying. It shouldn't be expected at all... even if there is nothing wrong.
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Offline boostd audi

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Re: Hissing sound from round display
« Reply #7 on: June 14, 2011, 05:16:18 pm »
upgrade FW

/thread
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Offline Sprocket

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Re: Hissing sound from round display
« Reply #8 on: June 14, 2011, 05:23:22 pm »
Quote from: NOTORIOUS VR on June 14, 2011, 04:32:45 pm
Quote from: jrussell on February 26, 2011, 06:42:04 pm
The frequency was changed in the latest firmwares to reduce noise due to the complaints. Nothing is wrong, it's expected.

the hissing is annoying. It shouldn't be expected at all... even if there is nothing wrong.

The above is out of context, since Jrussell's repy was in response to

Quote from: tweak on February 26, 2011, 02:20:25 pm
The Hissing sound actually disappeared after upgrading the firmware. I hope the instrument is still ok as i have nothing to compare with i don't know if its normal or not.

From that I would suggest latest firmware fixes the 'hiss'
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Offline tweak

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Re: Hissing sound from round display
« Reply #9 on: June 24, 2011, 11:23:00 pm »
The gauge still works and hissing is gone.
Upgrade at first chance if you have this problem :D
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