Technical Droning noise

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Technical Droning noise

ADAM16

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T-jets developed a droning noise, it doesn't relate to engine rpm but to the speed, at around 30mph it sounds like a noisy exhaust and gets higher pitched the faster I go, it never gets really high pitched its still a droning noise kind of like another engine running. noise is coming from front of car but can't tell which side.
 
Downhill at 30mph, drop it out of gear, allow the engine to idle and coast.
Does the sound continue ?

It'll be interesting to note if it's related to engine or running gear.
Similarly, also try coasting but in a gear.
 
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