Cerbera shaking and vibration above 75mph comes and goes

[ajmevans]

OK this car has always shimmy'd at the front end above 75mph or so, I thought is was wheel balance. I now have new wheels, new tyres, new front discs. It has been in the shop and checked all the bushes, joints etc, all found OK. They rebalanced the front.
The problem has not gone away, and it seems to get worse if I accelerate hard up and beyond 75, if I take it easy and build the speed slow it is OK (well much better), today I thought it was going to shake itself to bits after an 80-90 blast. The it's gone. Shop thought it maybe a prop-shaft out of balance, but there were no signs of anything amiss down there, they did check out the CV and said all was OK.
I am off to France in a week for a 1000 mile journey. I have no idea what it is or if I should even risk the journey...anyone go any ideas (BTW I am in the Bristol area

[Stunned Monkey]

Get a second opinion on tyre balance somewhere else. Wouldn't be the first time...

[Mad Mark]

I've got a wheel wobble on mine. I took them to a dedicated refurbishing place in Kent to get them balanced. Which they did but they said they only balance speeds up to 70 mph. my wobble comes in at just below 80 and goes just over 90. (Not on uk roads of course your honour lol ) Even after their balancing it is still there but not as bad.

[QuiteQuietCerb]

have all of them balanced by a good technician, have been suffering with this problem for 2 years until recently when i took it once more for balancing and all weels were out, the car is now stable at all speeds

[Englishman]

Not sure if it will help, but in my experience viabration at 75mph+ in many cars, not just TVR's, has been down to wheel balance or drive shaft imbalance at the rear. Have the rear wheels been balanced?

[LincsCerb]

Hi you say you have new wheels, if they are aftermarket ones check that you have the correct size spigot rings.
If the wheels don't centre properly it can feel like a balancing problem.

[sonnylad]

If you have locking wheel nuts could it not be solved simply by running all five standard nuts, atleast for a quick test.

I have never had this problem, but then i have also never used locking wheel nuts.

[Mad Mark]

sonnylad said:

If you have locking wheel nuts could it not be solved simply by running all five standard nuts, atleast for a quick test.

I have never had this problem, but then i have also never used locking wheel nuts.

Funny you should say this but on a previous car, many moons ago, I had a set of locking wheel nuts that caused wheel wobble. I ended up buying a second set so ran two on opposite sides of the wheel. Thats solved that one.

[Thunderroad]

Do you know a garage with a rolling road? I would be tempted to ask them 'nicely' if they would strap it all down for you and let you get the car up to the speed where your vibration is. First you could identify if it is engine speed related (revs) which would indicate a flywheel/engine issue, run it through full revs in every gear to eliminate gearbox issue or if it is road speed related which would indicate a running gear/drivetrain/rear wheels issue.
If there is no vibration then you would know that it was a front wheel/steering issue.
I'm not in the motor trade or anything but i have recently had a similar issue and if its not something you can visually see then it is a 'process of elimination'.

Mine turned out to be a buckled wheel on the front nearside. Gave me vibration at about 70 so not to dissimilar to yours.
The guy at the garage managed to balance the wheel better (as a temporary measure) by simply re-positioning the weights from the inner edge of the wheel (closest to the center of the car) to the outer edge, this bought the balancing weight vertically inline with the point of the wheel where it was fixed to the hub and done the trick,

Hope this helps.

[ajmevans]

Thanks for all these suggestions, will be out Monday to see if I can find someone with high end wheel balancing equipment/skills. The wheels are original TVR (so no spigots?), but second hand. The recent work included rebalancing the fronts, but despite the new wheels and tyres being newly fitting and balanced they only rebalanced the fronts...I think this is coming from the rear....Let's see what we can achieve.

[Stunned Monkey]

Mad Mark said:

I ended up buying a second set so ran two on opposite sides of the wheel. Thats solved that one.

I'm going to guess those wheels had either 4 or 6 nuts?

[Mad Mark]

Stunned Monkey said:

Mad Mark said:

I ended up buying a second set so ran two on opposite sides of the wheel. Thats solved that one.

I'm going to guess those wheels had either 4 or 6 nuts?

They had 4 nuts each.

[Brummmie]

Bent hub? Worth a try, get a run out gauge and it's easy to test.