Knocking-sound (Right/Rear)

[Porker]

Hi all,

My CSL produces a knocking sound at the backside on the right. It occurs whenever I take a medium to hard lefthand turn, or drive through potholes with the right rear wheel.

It might be worth to note that my car has PSS10 fitted, maybe it's a faulty Bilstein-damper?

[Mark CSL]

Hi
The standard rear springs brake also have you checked the pads as this can do that noise if you have a big brake kit.

The bottom suspension bar did this on my csl and was replaced under warranty
Its the one from the bottom of the hub to the Diff mount and is a round alloy bar.

Hope this helps :beer:

[Porker]

Hi
The standard rear springs brake also have you checked the pads as this can do that noise if you have a big brake kit.

The bottom suspension bar did this on my csl and was replaced under warranty
Its the one from the bottom of the hub to the Diff mount and is a round alloy bar.

Hope this helps :beer:
Hi Mark, thanks for the input.

I have AP-racing, but I doubt the pads can produce such a heavy knock? Springs are part of the PSS10-kit, so I assume they should be less prone to breaking? I'll have it checked together with the suspension bar.

Thanks!

[shimmy]

Rear bottom bush, not easy to get out!

[cantfind1]

did you change your rear top suspension mount when you put the Billys on or did you use the standard BMW rear top mount.....

If its original will prob be that....

[Porker]

did you change your rear top suspension mount when you put the Billys on or did you use the standard BMW rear top mount.....

If its original will prob be that....

Spoke to my technician, those have indeed been changed, according to him it should indeed be the rear bottom bush.

I'll have it changed right away.

[Funkster]

Rear bottom bush, not easy to get out!

I find getting in the bush is the hard bit...... Never a problem getting out :wink:

[Porker]

Just to make sure they change the correct part, could anyone give a partn° of the suspect bush?

Thanks

[Mark CSL]

No 4 Part no 33326770817

Part 5 can also clunk Wishbone, lower

http://www.realoem.com/bmw/showparts.do?model=BL96&mospid=50641&btnr=33_1365&hg=33&fg=30

:thumbs:

[CraigMillwardCroft]

I find getting in the bush is the hard bit...... Never a problem getting out :wink:
More lube required :whistle:

[shane@mbtech]

Just to make sure they change the correct part, could anyone give a partn° of the suspect bush?

Thanks

I'm gonna throw this one out there...........

Would it not be best letting them tell you which bush has gone, rather than the bush that someone on an internet forum who has not seen the car says is gone?

[Porker]

I'm gonna throw this one out there...........

Would it not be best letting them tell you which bush has gone, rather than the bush that someone on an internet forum who has not seen the car says is gone?

Well obviously, but I'm assuming one can hardly inspect the condition of a bush when fitted? If indeed, upon inspection, it appears something else has gone bust, they will change that. I'm just helping to point out the suspects. :beer:

The first three are for the bolt that changes the rear camber, this bolt is bent.

33 32 1 095 102
33 32 1 092 310
33 32 6 760 668



33 32 6 775 551 (bush)

[shane@mbtech]

Well obviously, but I'm assuming one can hardly inspect the condition of a bush when fitted? If indeed, upon inspection, it appears something else has gone bust, they will change that. I'm just helping to point out the suspects. :beer:

The first three are for the bolt that changes the rear camber, this bolt is bent.

33 32 1 095 102
33 32 1 092 310
33 32 6 760 668



33 32 6 775 551 (bush)

Of course you can check bushes for play whilst they are fitted. You dont need to press them out to check. You check in situ

[Porker]

Well obviously, but I'm assuming one can hardly inspect the condition of a bush when fitted? If indeed, upon inspection, it appears something else has gone bust, they will change that. I'm just helping to point out the suspects. :beer:

The first three are for the bolt that changes the rear camber, this bolt is bent.

33 32 1 095 102
33 32 1 092 310
33 32 6 760 668



33 32 6 775 551 (bush)

Car is at BMW at the moment, above mentioned bush was indeed worn, and replaced together with a couple others. The knocking should be cured, I'll have the car back on Wednesday. :smt023

[Porker]

Now regardless off bushes needing replacement, isn't this an absurd amount of bodyroll?
This is on PSS10 at 8 clicks.

http://i24.photobucket.com/albums/c6/Porkerr/253910_2371670587167_1558203547_n.jpg

[shimmy]

pss10 aint no good on track

[Porker]

pss10 aint no good on track

Right you are, little bit surprised though, I had higher expectations of Bilstein tbh...

[Mark CSL]

Now regardless off bushes needing replacement, isn't this an absurd amount of bodyroll?
This is on PSS10 at 8 clicks.

http://i24.photobucket.com/albums/c6/Porkerr/253910_2371670587167_1558203547_n.jpg

Like the way the Honda sneeked up the inside of you .

[Porker]

Like the way the Honda sneeked up the inside of you .

CSL's are no match for these torquey monsters!

[flow]

pss10 aint no good on track

But a Black (fastest color) with a bad PSS10 suspension is still as fast at spa as your intrax grey CSL :whistle: :partyman:

[shane@mbtech]

But a Black (fastest color) with a bad PSS10 suspension is still as fast at spa as your intrax grey CSL :whistle: :partyman:

And my KW was faster still:blalalala:

[flow]

And my KW was faster still:blalalala:

Hmmm

On Slick tyres :finga:

[shane@mbtech]

Hmmm

On Slick tyres :finga:

What ever you need to do to make yourself feel better:-D:beer:

[shimmy]

But a Black (fastest color) with a bad PSS10 suspension is still as fast at spa as your intrax grey CSL :whistle: :partyman:

Sloppy suspension at spa is ok, on a flat track it don't help (Zolder). :finga:

[O'Neill]

Sloppy suspension at spa is ok, on a flat track it don't help (Zolder). :finga:

Eat some carbs, you're too serious ;)

[shimmy]

Eat some carbs, you're too serious ;)

How is the YouTube visualisation practice going?

[O'Neill]

How is the YouTube visualisation practice going?

Fantastic :hahaha:

[flow]

Sloppy suspension at spa is ok, on a flat track it don't help (Zolder). :finga:

Haha , i think at zolder it was supersports VS cups :gayfight:

Shimmy i sold the 996 GT3 and bought a 996 cup :beer:

[shimmy]

Shimmy i sold the 996 GT3 and bought a 996 cup :beer:

wow, now who you gonna race in that (between gearbox rebuilds)

ps tyres did make a huge difference that day but as its your home track i would have expected a bigger fight :)

[flow]

wow, now who you gonna race in that (between gearbox rebuilds)

ps tyres did make a huge difference that day but as its your home track i would have expected a bigger fight :)

friends who also drive cups ;) .

You were faster at zolder , no doubt about that .
I have said it before , you are a better driver then me ;) .

But zolder is not my home track , i drive there once a year .

[shimmy]

friends who also drive cups ;) .

You were faster at zolder , no doubt about that .
I have said it before , you are a better driver then me ;) .

But zolder is not my home track , i drive there once a year .

so are you racing the Cup car or just TD?

[flow]

No time and money to race the cup , just TD .
I had an offer to trade my GT3 with a cup .
I only used the GT3 for TD's so why not use a cup for it , looks like fun .

[Porker]

edit

[Porker]

Original knocking sound was solved, appeared to be one of the bushes on the rear axle. Meanwhile my subframe has been repaired and reinforced, and all subframe bushes have been changed.

Yet, I'm still left with a knocking sound coming from the rear, although it seems it's more a diff related 'knock' than a worn bushing. It happens when suddenly accelerating in 1st/2nd or suddenly getting of the throttle in 1st/2nd. It only happens when everything is properly warm as well, no such knocking on short drives.

Note, my car is fully stripped, I obviously hear more mechanical noises than intended.

Car is booked in for new Cups and alignment this week, would be great to give them a heads up on what the problem is, so they can sort that out as well.

[Porker]

Original knocking sound was solved, appeared to be one of the bushes on the rear axle. Meanwhile my subframe has been repaired and reinforced, and all subframe bushes have been changed.

Yet, I'm still left with a knocking sound coming from the rear, although it seems it's more a diff related 'knock' than a worn bushing. It happens when suddenly accelerating in 1st/2nd or suddenly getting of the throttle in 1st/2nd. It only happens when everything is properly warm as well, no such knocking on short drives.

Note, my car is fully stripped, I obviously hear more mechanical noises than intended.

Car is booked in for new Cups and alignment this week, would be great to give them a heads up on what the problem is, so they can sort that out as well.

Delighted to say the knocking issue had been solved. It was one of the bolts holding the diff in place, it had come loose.

Tightened and car is perfect again, very relieved!