Knocking noise exiting junctions 'spiritedly'

[Chris71]

My Chim produces a faint knocking noise at the back if you accelerate very hard coming out of junctions.

The car's been throughly inspected by a well-regarded TVR garage that couldn't find anything wrong with it, barring a slightly tired clutch. The noise is only noticeable when - to be blunt - driving like a complete hooligan. I can't replicate it at higher speeds, it's only when being very aggressive with it in a low gear from (or virtually from) standstill, and I wondered if it could be the inside rear wheel hopping as it loses grip, a bit like old fashioned axle tramp?

[Chassis 33]

Sounds possibly like a bit of a soft wishbone or diff bush maybe?
Regards
Iain

[phillpot]

Sounds like the noise my S used to make, new CV joints cured it.

[FlipFlopGriff]

Drop links?
FFG

[Timja]

Worn diff bushes?

eta: Is it one knock of a series of knocks? Above guess based on one knock each time you put your foot down.

[Chris71]

Nope, it's a series of knocks - maybe four or five before it goes away.

[V8 GRF]

One (or both) of my rear Nitrons used to knock under acceleration until they were rebuilt.

[TVRfix]

phillpot says
Sounds like the noise my S used to make, new CV joints cured it.


Probably what he says.

[macdeb]

TVRfix said:

phillpot says
Sounds like the noise my S used to make, new CV joints cured it.


Probably what he says.

ditto. Mine was.

[Chris71]

Sounds like CV joints are a likely candidate. Does this suggest impending failure or should I be okay for a while? The plan is obviously to sort out the issue whatever it is, but I have a limited amount of time before the Spanish trip now and a couple of other jobs to do. New shocks and springs next week, for example.

[dumbfunk]

Chris71 said:

Sounds like CV joints are a likely candidate. Does this suggest impending failure or should I be okay for a while? The plan is obviously to sort out the issue whatever it is, but I have a limited amount of time before the Spanish trip now and a couple of other jobs to do. New shocks and springs next week, for example.

You may save a decent amount of money if you get it done with the dampers as I *think* they will all need to come off again to change the CV joints.

[Chris71]

Will certainly get it checked out while the dampers are off.

I just spoke to the TVR Centre for another quote I need and mentioned this, but they were a bit sceptical on CV joint failure. Apparently they've only seen one instance on a Chimaera in the last 10 years...

[dumbfunk]

Really? I've had CV joints replaced on 2 of my Griffs over a period of ten years and I'm generally an exceptionally mechanically sympathetic driver.

(Both at 60k miles+ incidentally)

[macdeb]

First time I've had to replace them [4th TVR to date] but my car has only covered 14.5k miles from new. Also, the wear seemed to be between the cv joint and driveshaft splines. Fitted new ones and now OK. I until now had never heard of them giving up but since I've discovered it's more common than I thought.

[Chris71]

Interesting. Either way it needs to go into the workshop for a couple of jobs which are beyond my scope, so I'll get it checked out at the same time.

[V8 GRF]

I'd have the dampers checked at the same time as that was the source of the 'clunk' on my car.

[Chris71]

The dampers should be coming off in a matter of days, so we shall see. I'm aware there's a potential for 'clonks around the rear end' to be something expensive, so I'd be quite relieved if it was due to the tired old dampers which I'd budgeted to change when I first bought the car.

[dumbfunk]

Chris71 said:

The dampers should be coming off in a matter of days, so we shall see. I'm aware there's a potential for 'clonks around the rear end' to be something expensive, so I'd be quite relieved if it was due to the tired old dampers which I'd budgeted to change when I first bought the car.

I'd bet on the CV joints - it's the exact symptoms I had both times.