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Post by limkopi on Jul 3, 2016 23:02:51 GMT 8
I realise that when on dynamic mode, there's a drrrrr sound. Once I switch over to Auto mode, the sound is gone. Anyone noticed that? Normal?
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Post by Tom Cruise on Jul 4, 2016 0:08:14 GMT 8
Where did the sound originate from? Engine Bay or below car?
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Post by limkopi on Jul 4, 2016 0:09:03 GMT 8
sound fm engine bay.
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Post by CRViper on Jul 4, 2016 0:50:34 GMT 8
Not exactly sure of ur case, but the last time when I had sound at high rpm on dynamic mode was due to a leak on the gearbox caused by insufficient transmission fluids
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Post by limkopi on Jul 4, 2016 11:10:09 GMT 8
I was coasting at 80-90kmh on highway, rpm slightly above 2k. Heard the sound, changed to Auto mode, sound gone. Change back to dynamic, sound came back. Back to Auto, sound gone.
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Post by starlightexpress on Jul 4, 2016 11:48:03 GMT 8
I was coasting at 80-90kmh on highway, rpm slightly above 2k. Heard the sound, changed to Auto mode, sound gone. Change back to dynamic, sound came back. Back to Auto, sound gone. Sounds like car needs kopi. My PB occasionally gives drrrrrrrr sound like a small drummer residing near my accelerator pedal when I lift off the the accelerator in cruise near 90kmh. |
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Post by Tom Cruise on Jul 4, 2016 12:38:35 GMT 8
Was researching on diverter valve of the turbo and read:
Using the main spring means the DV+ can open and close progressively in response to how much boost pressure is
present, unlike the factory diverter which just opens fully regardless of whether there is boost to vent or not.
Because this operation method is different from the factory diverter, it is not unusual to hear a different sound
from the intake when lifting off the throttle at low RPM, especially if you have an aftermarket intake or a larger
turbo installed.
Could the sound be also created by a faulty stock diverter valve in the same circumstances when throttle is lifted at low rpm?
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Post by limkopi on Jul 4, 2016 13:58:47 GMT 8
Was researching on diverter valve of the turbo and read: Using the main spring means the DV+ can open and close progressively in response to how much boost pressure is
present, unlike the factory diverter which just opens fully regardless of whether there is boost to vent or not.
Because this operation method is different from the factory diverter, it is not unusual to hear a different sound
from the intake when lifting off the throttle at low RPM, especially if you have an aftermarket intake or a larger
turbo installed.Could the sound be also created by a faulty stock diverter valve in the same circumstances when throttle is lifted at low rpm? Hmm, gonna get PA to check during next servicing. |
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Post by limkopi on Jul 4, 2016 14:02:44 GMT 8
Btw, diff in FC betw Dynamic and Auto (almost same traffic condition. 10pm fm Tampines to Jurong West via PIE. Cruising speed 70-90+/- with very few braking)
Auto - 18-19km/l
Dynamic - 14-15km/l
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