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Hi,Wife changed car as she drives much and needs diesel. This is 2013 1.6CRDi i30 hatchback. Tyres are Hankook Kinergy Eco 195/65 R15. Car is very good in every other way but the tyre noise is really horrible. Starting from 50kmh. I stripped the interior and added STP black gold to the trunk and floor. Also foam sound deadener wherever there was space eg. around rear fender. Having finished applying the butyl mats and test drove the car, it’s still the same. You can imagine how that feels thinking the amount of work it was.It seems the noise is structure-born noise. Comes through the suspension to the car frame and only way to get rid of it is to isolate the suspension from the car body. That noise is like there’s a very bad wheel bearings in front. Anyone tracked down what component in suspension does conduct the noise? Would aftermarket coilover kit help?This issue is only on rough tarmac. Here in Finland where most of the people drive studded tyres long winter months, those studs eat the bitumen between the stones, making the surface rough.
Quote from: 2beer on August 26, 2018, 13:09:14Hi,Wife changed car as she drives much and needs diesel. This is 2013 1.6CRDi i30 hatchback. Tyres are Hankook Kinergy Eco 195/65 R15. Car is very good in every other way but the tyre noise is really horrible. Starting from 50kmh. I stripped the interior and added STP black gold to the trunk and floor. Also foam sound deadener wherever there was space eg. around rear fender. Having finished applying the butyl mats and test drove the car, it’s still the same. You can imagine how that feels thinking the amount of work it was.It seems the noise is structure-born noise. Comes through the suspension to the car frame and only way to get rid of it is to isolate the suspension from the car body. That noise is like there’s a very bad wheel bearings in front. Anyone tracked down what component in suspension does conduct the noise? Would aftermarket coilover kit help?This issue is only on rough tarmac. Here in Finland where most of the people drive studded tyres long winter months, those studs eat the bitumen between the stones, making the surface rough.Hey mate,Check my recent posting about a similar problem with my wife's i30 Tourer/wagon CRDi (also 2013) - the tyre noise is worst around 50-55km/h as well, but it kind of disappears when above 80kmh - in fact pretty quiet around 110kmh (aside from tyre roar on rough bitumen, which is expected given this is a non luxury small car).The latest diagnosis is my mechanic reckons the tyre is wearing out not quite round (possibly scalloping/bulging where previous puncture repairs were - come to think of it).The tyres are due for replacement soon - I'm keen to see if the noise goes away with new tyres. I'll update.
Aren’t we discussing the OP’s problem with a 2013 hatchback
Quote from: CraigB on August 27, 2018, 00:19:40Aren’t we discussing the OP’s problem with a 2013 hatchback Yes.
Quote from: Surferdude on August 27, 2018, 00:28:51Quote from: CraigB on August 27, 2018, 00:19:40Aren’t we discussing the OP’s problem with a 2013 hatchback Yes.Apologies - in my haste last night I didn't realise the OP's vehicle was a hatchback. The GD hatchback I believe has a beam rear end not independent.BTW I'm quite concerned about the rear dampers wearing out and contributing to the scallop - is there a way of checking these dampers out? I've done the bounce test a few times but can't see any worrying levels of oscillation, plus hitting bumper corners hasn't thrown the car off line or anything - I just hate bringing the car into the "experts" like Midas and Pedders (in Aust) where it's 99.5% confirmed "yep your end is stuffed and it'll be $1k to replace it blah blah blah".
Quote from: aranciataoz on August 27, 2018, 01:40:05Quote from: Surferdude on August 27, 2018, 00:28:51Quote from: CraigB on August 27, 2018, 00:19:40Aren’t we discussing the OP’s problem with a 2013 hatchback Yes.Apologies - in my haste last night I didn't realise the OP's vehicle was a hatchback. The GD hatchback I believe has a beam rear end not independent.BTW I'm quite concerned about the rear dampers wearing out and contributing to the scallop - is there a way of checking these dampers out? I've done the bounce test a few times but can't see any worrying levels of oscillation, plus hitting bumper corners hasn't thrown the car off line or anything - I just hate bringing the car into the "experts" like Midas and Pedders (in Aust) where it's 99.5% confirmed "yep your end is stuffed and it'll be $1k to replace it blah blah blah".If the bounce test isn't showing anything untoward, and there are no leaks (a small amount of staining around the shaft is generally OK), then they should be OK.To save me looking back, what kilometres have you done?Also, if the shocks are gone, you'll notice some "hoppiness" under heavy braking on uneven surfaces. (which I assume you are referring to above where you mention bumper (y) corners not throwing the car off line.
Quote from: Surferdude on August 27, 2018, 00:28:51Quote from: CraigB on August 27, 2018, 00:19:40Aren’t we discussing the OP’s problem with a 2013 hatchback Yes.Completely different symptoms to aranciataoz then as I get exactly the same harmonics issue which has nothing to do with worn shocks.
Quote from: Surferdude on August 27, 2018, 02:00:07Quote from: aranciataoz on August 27, 2018, 01:40:05Quote from: Surferdude on August 27, 2018, 00:28:51Quote from: CraigB on August 27, 2018, 00:19:40Aren’t we discussing the OP’s problem with a 2013 hatchback Yes.Apologies - in my haste last night I didn't realise the OP's vehicle was a hatchback. The GD hatchback I believe has a beam rear end not independent.BTW I'm quite concerned about the rear dampers wearing out and contributing to the scallop - is there a way of checking these dampers out? I've done the bounce test a few times but can't see any worrying levels of oscillation, plus hitting bumper corners hasn't thrown the car off line or anything - I just hate bringing the car into the "experts" like Midas and Pedders (in Aust) where it's 99.5% confirmed "yep your end is stuffed and it'll be $1k to replace it blah blah blah".If the bounce test isn't showing anything untoward, and there are no leaks (a small amount of staining around the shaft is generally OK), then they should be OK.To save me looking back, what kilometres have you done?Also, if the shocks are gone, you'll notice some "hoppiness" under heavy braking on uneven surfaces. (which I assume you are referring to above where you mention bumper (y) corners not throwing the car off line.I haven't stuck my head under to check out the shaft but definitely no hoppiness under heavy braking, but not that I've done much heavy braking! It's definitely stable as when taking corners - just did a Sydney-Canberra round trip over the weekend, including a jaunt up to Corin Forest at pretty good speeds. The car just had its 75k service done. Running beautifully, even 4.5L/100km readout on the way home on the Hume yesterday. Never had the car running so lean, could be due to the 5W/30 full syn oil and 2nd tank of BP Ultimate Diesel.But the tyre roar at 50kmh still annoys, having said that one can't hear it when the boot was once again packed to the brim during the weekend away (same deal in April when we headed up north). Very interesting, these harmonics ....
I guess my point is, it's not the shocks that cause the noise but the effects of the shocks'condition.
My bet is the tyre noise is drowned out by the snarl of the big engines and semi open exhausts...….