subiesnack Posted November 5, 2019 Share Posted November 5, 2019 I've been noticing a deep rumble highway speeds, it's subtle, and quiet, and I can just barely feel it through my seat. It's not a flat monotone rumble, it kind of fluctuates(loud, quiet, loud, quiet, etc) It doesn't change with speed or rpm. I notice it most when driving in 5th gear (around 2k- 2500rpm) but I can feel it slightly even with the clutch pressed in and coasting at around 100km/h. I figured this might just be the way subaru awd sounds under these circumstances. If not, does anybody have any ideas what could be causing this? 02 legacy 5spd 235k kms. Link to comment Share on other sites More sharing options...
doublechaz Posted November 5, 2019 Share Posted November 5, 2019 Slight imbalance in the drive shaft? Resonant frequency in some part of the body or structure? Tire noise? It's pretty much impossible to figure out without hearing it. But I haven't heard anyone else express a concern that sounds similar. I think third gen are generally a little quieter than second gen so I couldn't say from direct experience. My exhaust is too loud to pick up lots of subtle noises, but it has a definite resonance with the volume of air in the cabin. There is a range where it is quite unpleasant. At other power/speeds where the engine is making a lot more noise, the sound comfort is much better because no resonance. Link to comment Share on other sites More sharing options...
RumbleRumble Posted November 5, 2019 Share Posted November 5, 2019 Check the wheel bearings. Link to comment Share on other sites More sharing options...
subiesnack Posted November 5, 2019 Author Share Posted November 5, 2019 Slight imbalance in the drive shaft? Resonant frequency in some part of the body or structure? Tire noise? It's pretty much impossible to figure out without hearing it. But I haven't heard anyone else express a concern that sounds similar. I think third gen are generally a little quieter than second gen so I couldn't say from direct experience. My exhaust is too loud to pick up lots of subtle noises, but it has a definite resonance with the volume of air in the cabin. There is a range where it is quite unpleasant. At other power/speeds where the engine is making a lot more noise, the sound comfort is much better because no resonance. I'll look into the drive shaft.. Hope it's not that haha, just put new tires on Link to comment Share on other sites More sharing options...
subiesnack Posted November 5, 2019 Author Share Posted November 5, 2019 check the wheel bearings. Link to comment Share on other sites More sharing options...
doublechaz Posted November 6, 2019 Share Posted November 6, 2019 Did the sound appear when you put the new tires on? Link to comment Share on other sites More sharing options...
subiesnack Posted November 6, 2019 Author Share Posted November 6, 2019 Did the sound appear when you put the new tires on? No it was there before the new tires, they didn't have any effect Link to comment Share on other sites More sharing options...
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