Noise for the rear

[Eddie 4.2]

Chaps got a bit of a noise from THE NSR WHELL as i pull away get a loud donk banging noise.
Only does this after driving about 5 mil any ideas.


I have changed the rear diff void bushes and the dampers still the same.

I have had this noise for a while want to get rid of now

Thanks EddieFURBALL50004.2

[1310angela]

Hi Eddie
I seem to have the same problem? Does yours get quicker the more gas you give it. I've been told it is the pads knocking but it does not sound like pads to me. You said you have done the diff bushes was it a bit job and where did you get them done. I think mine have gone.

Cheers

John

[Eddie 4.2]

Hi John its not the pads mate,i put the rear bushes in myself if u want them done let me know


Are u up for the FURBALL5000


Eddie 4.2

[tvr-fan]

Did you manage to replace the top diff mount as well ed ?

[Eddie 4.2]

Hi Kev do u mean the one u can just about see let alone touch



Eddie


thats a no btw

[tvr-fan]

Aha well that'l be where your noise is coming from im afraid.

Most definately you are suffering from top diff mount failure so you need to be very smooth with your gear change for a while until you get it fixed, and dont ask how much it costs to fix cos i dont want to frighten you




>> Edited by tvr-fan on Saturday 23 April 22:00

[Mad Mark]

Are you sure it's the NSR Wheel?
I get this loud 'hollow thud donk' type noise from the rear, at first i thought it was someone hitting the back of the car. But then I heard it when I opened the boot.

I dropped my car off at Leven for a service today and asked Simon if he knew what it was, straight away he said it was the fuel tank. Apparently there is some sort of fuel venting system, which allows fuel vapour to be sucked back into the engine (EU regulations). This system gets blocked and doesn't work and causes the tank to warp under pressure, and the donk you, or at least I can here, is the tank popping in and out of shape. Apparently this can also then cause the baffles in the tank to come loose, and start to rattle.
There is a 'fix' which Leven are going to carry out on mine whilst it's being serviced.

[tvr-fan]

Mad Mark said:

This system gets blocked and doesn't work and causes the tank to warp under pressure, and the donk you, or at least I can here, is the tank popping in and out of shape. Apparently this can also then cause the baffles in the tank to come loose, and start to rattle. There is a 'fix' which Leven are going to carry out on mine whilst it's being serviced.

Does this hollow donk noise happen when you pull away like eddie is experiancing or is it at random ?



>> Edited by tvr-fan on Saturday 23 April 22:10

[Eddie 4.2]

tvr-fan said:

Aha well that'l be where your noise is coming from im afraid. Most definately you are suffering from top diff mount failure so you need to be very smooth with your gear change for a while until you get it fixed, and dont ask how much it costs to fix cos i dont want to frighten you >> Edited by tvr-fan on Saturday 23 April 22:00

Hi Kev its not the top bush their is no play in it


Eddie

[tvr-fan]

Eddie 4.2 said:

Hi Kev its not the top bush their is no play in it Eddie

Hmmmmmm interesting ????

Anyway off topic...... are you going tomorrow and if so what time ed ?

[Eddie 4.2]

ILL have to blow out the gaydon as i cant do a 7am start due to beer
iam going to the meet in sevenoaks at 12.30
fancey it ill buy u and the misses dinner as i owe u one big time


Ed

[tvr-fan]

Ok ed that sounds good so then you can take me for a spin too and listen to donking noises eh let me know the details



>> Edited by tvr-fan on Saturday 23 April 22:27

[Eddie 4.2]

Nice one mate ill u in the morn


Eddie

[Mad Mark]

tvr-fan said:

Does this hollow donk noise happen when you pull away like eddie is experiancing or is it at random ? >> Edited by tvr-fan on Saturday 23 April 22:10

Yes, most of the time. It tends to start about 5-10 mins after driving, and then it would happen just as i pull away from rest, or turning on to a roundabout.
My theory is that after 5-10 mins the pressure changes in the tank and then as you move away the fuel 'surging' in the tank 'helps' the tank to pop. (something like that anyway)

I don't think it's bushes, because why does it only do it after 5+ mins of driving?

[Mad Mark]

I don't know if this will work, i've just thought of it, try opening the boot try banging the fuel tank to see if the noise is similar.
Also do you get a 'whoosh' as you open the fuel filler cap?

[Eddie 4.2]

Mad Mark said:

I don't know if this will work, i've just thought of it, try opening the boot try banging the fuel tank to see if the noise is similar. Also do you get a 'whoosh' as you open the fuel filler cap?

Hello Mark how are u mate ill give it a try


Eddie

[Mad Mark]

Hi Eddie, doing good thanks.
My car's being serviced at Levens 'till wed/thurs i'll let you know if they stop my 'donking'.

I would like to point out that my 'donk' was not an every trip kind of 'donk', more of an occasional kind of 'donk', but would always happen just as I drive away from rest after driving for a few miles.

Could possibly be linked with the amount of fuel in the tank and also the weather. Mine didn't do it enough for me to work out a pattern.

[easto]

Could be anti roll bar bushes....worth a look. Mine had a loud banging NSR and it was the bush that had squirmed out of place (i think - didnt fix it myself)