new QA1s and still wobble - need help please

[jhv48]

Before you do anything else, get the fronts road force balanced.

Go online and locate a shop that uses the Hunter GSP9700 balancing machine and turn it loose on your front tires. It will match the highest point on your rim with the lowest point of your tire and then will balance them. If that doesn't do it, something is out of round.

[Shootnride]

Jurgen,

Here's another thread you may want to look at. Read Randy Rosenberg's comments about his solution to this problem. I will be checking my car for the same issues he had.

Club Cobra > Club Forums > Bay Area Cobra Club
Suspension/handling

Ted

[JW313]

Originally Posted by Shootnride

Jurgen,

Here's another thread you may want to look at. Read Randy Rosenberg's comments about his solution to this problem. I will be checking my car for the same issues he had.

Club Cobra > Club Forums > Bay Area Cobra Club
Suspension/handling

Ted

Good point - read through the thread. Mine is #1385, so the design issue after 1250 was solved. However, I do suspect a different root cause than just he tires. Not sure how I can work this issue from overseas, since there aren't many cobra shops around.

I am getting my hopes up with the road force balancing - we'll see.

[JW313]

Originally Posted by jhv48

Before you do anything else, get the fronts road force balanced.

Go online and locate a shop that uses the Hunter GSP9700 balancing machine and turn it loose on your front tires. It will match the highest point on your rim with the lowest point of your tire and then will balance them. If that doesn't do it, something is out of round.

Well - good point with the hunter locater. In fact, I did find a dealer here in Germany (actually not too far) that has one of the GSP9700 road force balancer. I begged for an appointment today and 14:00 it is.

I always had some sort of vibrations and wobble in the car. But after replacing the shocks it is somwhat different. No clunking noises after going over uneven surfaces but continous steering vibs.

The AVOs were totally shot, especially the mount rubber - dangerous.

True is, that the vibrations did get more intense with the Avons.

So - first, I'll try the road force balancing and then I start replacing stuff like ball joints etc.

Keep you posted - thanks again

[ha_pe_1968]

Hi Jürgen!

Had the same problem with my first set of Avons - the back tires were not round - after changing it was a lot better. If they are not round you can balance whatever you want and will have no sucess. I am driving with 28 psi.
When the car is not moving some days i have a shaking at the steering wheel at the first miles - then it goes back to normal. So it seams Avons tend to flat spots. At lower speeds i have some light vibrations and shakings at my steering wheel too...thats not perfect but i am living with it :-)

Greetings from Austria
Peter

[JW313]

That doesn't look good - just as an FYI for all, that still use the AVOs (I guess there aren't too many).

[Mark IV]

Originally Posted by ha_pe_1968

Hi Jürgen!

Had the same problem with my first set of Avons - the back tires were not round - after changing it was a lot better. If they are not round you can balance whatever you want and will have no sucess. I am driving with 28 psi.
When the car is not moving some days i have a shaking at the steering wheel at the first miles - then it goes back to normal. So it seams Avons tend to flat spots. At lower speeds i have some light vibrations and shakings at my steering wheel too...thats not perfect but i am living with it :-)

Greetings from Austria
Peter

28 PSI is high for the street. Somewhere in the 21-24 range would be preferred for street use.

[ha_pe_1968]

Originally Posted by Mark IV

28 PSI is high for the street. Somewhere in the 21-24 range would be preferred for street use.

After some reading and different opinions i started on 21 and ended at 28psi. Tire wear looks ok for me and the feeling is in my opinion better - mostly i am driving spirited on small montain roads - but thx for the info...i was testing it 2 years ago...think i will make this test again :-)

Thanks,
Peter