[100BHP]

Hi,
I have a 2006 Duo LX wagon R. I got its tyres replaced at 51K (new tyres with tubes from Bridgestone - GP2, stock size). Earlier tyres from JK had no problem at all.
After that my woes started.
The car front wobbles up & down heavily (like jumping at its toes) at speed between 70 ~ 90 Kmph.
There is no vibration in steering wheel or side movement.
Rohan Auto, Gr Noida engineer told that it is tyre problem.
I got the tyres checked by Bridgestone technical person at their authorised tyre centre in Ashram, Delhi.
They had given no problem chit & said nothing can be done. (All tyres got wheel balancing done, tyre pressure checked).
But still the problem remains.
On advise, i got the front shockers changed with new & again the tyre alignment & wheel balancing done, but still the problem is there

My driving is mostly on expressway & these speeds are frequently achievable .
Last week i sent this car to Apra Auto, Okhla with a promise that this problem will be sorted out . They again did alignment & wheel balancing (foc) & sent the vehicle back, but still....no solution. Even after feedback about problem, now they are not responding (Maruti's troubleshooting skills are limited, i think )
Anyhow, the problem is still there.
Can you provide some pointers to this problem.

[Jaggu]

Have they checked other suspension components and have you tried swapping the tires front to back?

[100BHP]

Originally Posted by Jaggu

Have they checked other suspension components and have you tried swapping the tires front to back?

Yes, the tyres were rotated front to back.

Can you elaborate on other suspension components pls ?

[greenhorn]

swap the tyres with another wagon R if possible

suspension bits = ball joints, steering rods etc

[Jaggu]

And lower arms and balance rod with bushes. Check the brake discs also just in case.

[100BHP]

Originally Posted by greenhorn

swap the tyres with another wagon R if possible

suspension bits = ball joints, steering rods etc

Originally Posted by Jaggu

And lower arms and balance rod with bushes. Check the brake discs also just in case.

Thanks, but what could go wrong with the change of tyres only ?
Also, why this is happening in speed range from 70~90 Kmph ?
Shall the tubes be checked also for their form when inflated ?

[Jaggu]

Change of tires can upset lot many old parts, including a worn out tie end which can start resonating with the springs. So unless you do a complete check of suspension and steering component you might not be able to find the culprit. And what about wheel discs are they in good shape?

[kpzen]

Originally Posted by 100BHP

Thanks, but what could go wrong with the change of tyres only ?

A LOT. Complete dynamics of the car can change with a set of tire change.
Tires are the only contact point between your car and the road.

Originally Posted by 100BHP

Also, why this is happening in speed range from 70~90 Kmph ?

I'm assuming it to be a tire fault and at that speed, the effect is getting amplified. Did u try speeds above 90kph ?

Originally Posted by 100BHP

Shall the tubes be checked also for their form when inflated ?

Did u change the tubes along with tires or are u running the old set ? if its the latter, then u need to get them checked as well.

PS: Lets go for a TD.

Originally Posted by Jaggu

And what about wheel discs are they in good shape?

Jags
Why do u doubt the discs ?
The problem is not while braking and there's no noise.

[Jaggu]

Small warp, making the wheels unbalanced and creating a resonation. Symptoms do point out to something resonating, thats why its happening in a particular speed range. What is it that is resonating, if the wheels are properly balanced?

[100BHP]

Originally Posted by kpzen

A LOT. Complete dynamics of the car can change with a set of tire change.
Tires are the only contact point between your car and the road.



I'm assuming it to be a tire fault and at that speed, the effect is getting amplified. Did u try speeds above 90kph ?

Did u change the tubes along with tires or are u running the old set ? if its the latter, then u need to get them checked as well.

PS: Lets go for a TD.


Jags
Why do u doubt the discs ?
The problem is not while braking and there's no noise.

There is no resonance above 90Kmph (if its there, its not noticeable at all),I had driven at 110~ 120 few times.
Tubes were also changed with the tyres.
We can go for TD when you are not in your rocket

Thanks Jaggu for your inputs, I will talk to MSM for their check up, but it means there is potential problem with all cars which goes for tyre change ?