gemsdad · Sep 28, 2011

Saint.V8 said:
One of the reasons the noise is louder with throttle is the fact that the engine is trying to drive the wheels faster than they are going presently, this has the effect of moving the tyre tread blocks, and the 'humming' noise is the blocks moving back into place once they have left the road surface and the noise is echoed around the empty airspace within the tyre hence the low bass sound (as the tyre is acting like the skin of a drum)

When off the throttle, the tyre isn't trying to impart traction into the road surface anymore but merely 'going with the flow' so the tyre treads don't move about as much....

This is why new tyres are noiser than worn and also why Mud tyres are noiser than Road tyres as the blocks are bigger and impart a greater movement and vibration.

Just my twopeneth worth...

yes i would agree with mr saint on this problem.either put more air in the tyres,or wait until they have bedded in and worn down a little.

MikeV8SE · Sep 28, 2011

Thanks guys! Having read around the interweb I have found recommended pressures to be 27 Psi front, 34 Psi rear, so I will drop/increase them to that accordingly, see if it makes any difference.

I am also doing a 300 mile round trip this weekend towing a trailer, which should help flatten off-bed in the tyres a bit.

If neither of these sorts the issue though, I'm not sure what to do! Will report back after this weekend

MikeV8SE · Sep 29, 2011

OK, I dropped the front tyre pressures to 28Psi and raised the rears to 34Psi, it's made a very slight difference but there's still a lot of rumbling/noise at 70mph! Hmmm....

gemsdad

NOT BOTHERED.

MikeV8SE

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MikeV8SE

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