Pacific Motorway Resonance

[donweather]

Just wondering for those Brisvegas Tigs out there whether they've experienced the following?

I've driven on the Pacific Motorway between Brisbane and the Goldy twice now in the Tig, and both times I've noticed due to the uneven concrete pavement, the Tig's suspension starts to setup a sort of resonance frequency, so much so that in the cabin, you're constantly bouncing up and down quite quickly, which actually makes it difficult to talk as your diaphragm also starts to resonate.

Has anyone else experienced something similar? Kinda gets worse in the 110-120km/hr range and for some even more bizarre reason it feels a little worse with cruise control on.

[clip]

Can't say I noticed it, but have only driven a long there twice.

What wheels/tyres are you running on don?

I find the Tig does seem sensitive to road surfaces, and particularity concrete. The section past Aussie world between the Caloundra and Mooloolaba turn offs, is really noticeable. It is also got much worse with the 19" wheels. When I change tyres on the 19" to the Bridgestones, it helped dramatically. But for some reason at certain speeds on certain surfaces, the car definitely does start up a resonating sound in the cabin that can get annoying. A change of speeds usually fixes it (but not always practical to do!).

[donweather]

Perhaps it is the tyres?? I'm running on 235/50/R18 Continentals (cheap tyres the dealer fitted with the alloys).

It's not a resonating sound....the car physically bounces up and down in a resonanting frequency. Quite annoying for when you're trying to talk.

Drove to the Sunny Coast today and didn't notice it at all, hence I reckon it could just be the concrete pavement on the Pacific Motorway.

[Sanman]

It's not a resonating sound....the car physically bounces up and down in a resonanting frequency. Quite annoying for when you're trying to talk.

Beware that the shockers are getting a serious workout in this circumstance and will overheat - so if they're not faulty from the factory, they soon will be faulty from overheating

[donweather]

Beware that the shockers are getting a serious workout in this circumstance and will overheat - so if they're not faulty from the factory, they soon will be faulty from overheating

Thanks Sanman, hence why I'm trying to ascertain if it is a fault of the car, or just a function of the roadway surface and Tig suspension (ie why I've asked if others on here are experiencing the same effect?)

[jimbomort]

the car physically bounces up and down in a resonanting frequency. Quite annoying for when you're trying to talk.

Drove to the Sunny Coast today and didn't notice it at all, hence I reckon it could just be the concrete pavement on the Pacific Motorway.

Don - travelled same road myself on return from Bisvegas today to northern new south, roughly 50klm south of Brissy Tig was oscillating a bit, though I would say heaps, but enough to notice and wonder what was going on. Seems there is in effect some form of wide spaced corrugation on that section.

I wouldn't say it was bad in my Tig, but I have the stock 16's.

So certainly the road surface, beyond that hard to say, perhaps it is your tyres, or speed at the time, or perhaps just different perceptions of degree? Anyway hope this helps

[clip]

Sounds like another fine example of Qld road construction!

Not to worry though, I'm sure in a year or two it will have to be ripped up and redone again!

[donweather]

Don - travelled same road myself on return from Bisvegas today to northern new south, roughly 50klm south of Brissy Tig was oscillating a bit, though I would say heaps, but enough to notice and wonder what was going on. Seems there is in effect some form of wide spaced corrugation on that section.

I wouldn't say it was bad in my Tig, but I have the stock 16's.

So certainly the road surface, beyond that hard to say, perhaps it is your tyres, or speed at the time, or perhaps just different perceptions of degree? Anyway hope this helps

Thanks Jimbo. Nice to know its not just my Tig, and perhaps my tyres accentuate it? I've just travelled that road a lot in my commodore with very stiff and lowered suspension and never had this problem.

[donweather]

Not to worry though, I'm sure in a year or two it will have to be ripped up and redone again!

I doubt it very much. It's concrete pavement and has a design life of 40 years so they wont be ripping it up anytime soon.