Yea I think I need more info as well. If it’s an engine problem it might make the same noise if you just brought the engine to the same RPM when it made the noise, if not you might be able to ‘power brake’ it to see if you can get it to make the noise under load, put it in drive or reverse (in a safe area) and hit the gas as you hold you foot on the brake, don’t do this for too long just long enough to see if you can dupoicate the noise. If it’s speed related it could be a tire, bearing, transmission problem or ‘other’ it’s hard to say. The next step is to study the noise and see if you can nail down the effected system.