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TBE997
Silverstone


Joined: 19 Mar 2017
Posts: 112
Location: London


PostPosted: Sun Jan 07, 2018 8:55 pm    Post subject: Exhaust Rattle Sound Reply with quote

still haven't managed to get the car inspected by a garage/shop (any recommendations in/around London appreciated).

on very low revs (below 1k), when i slow release the clutch and gentle touch the gas pedal (i.e. in stop and go traffic), i get this exhaust rattle. I suspect a broken or cracked exhaust bracket.. anyone any clue by any chance? don't think it's the engine i.e. something going bad?

i have tried to replicated the noise yesterday and recorded it:


Open Youtube Page


https://www.youtube.com/watch?v=f-A5yddQmkM
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resigner
Suzuka


Joined: 19 Dec 2013
Posts: 1056



PostPosted: Sun Jan 07, 2018 9:20 pm    Post subject: Reply with quote

Whereabouts in London? If North, look up Matt at Porschacare, based around codicote/welwyn garden city. Knows his stuff......
 
  
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jpsh120
Hockenheim


Joined: 30 Aug 2015
Posts: 640
Location: Somerset


PostPosted: Sun Jan 07, 2018 9:50 pm    Post subject: Reply with quote

Almost certainly the exhaust brackets that are welded between the pipes. Take the bumper off and have a good look.

I had exactly the same noise on mine, you could also hear it by hitting the tailpipe end on.

I found 3 in total that had split, a few dabs of weld had it all sorted.
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pcat
Spa-Francorchamps


Joined: 16 Oct 2013
Posts: 281



PostPosted: Sun Jan 07, 2018 11:19 pm    Post subject: Reply with quote

I had this - turned out to be PSE actuator rod snapped leaving the butterfly valve flapping about inside
 
  
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leasky
Silverstone


Joined: 05 May 2010
Posts: 149
Location: NE Scotland / Middle of the Sand Pit (Iraq)


PostPosted: Mon Jan 08, 2018 5:54 am    Post subject: Reply with quote

pcat wrote:
I had this - turned out to be PSE actuator rod snapped leaving the butterfly valve flapping about inside


Was that an easy fix?

Colin.
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elliot_holder
Spa-Francorchamps


Joined: 15 Nov 2010
Posts: 374
Location: Guildford


PostPosted: Mon Jan 08, 2018 8:54 am    Post subject: Reply with quote

Either it'll be one of the issues listed above (which are most likely culprits).

If not it could be the baffles inside the PSE. I've come across this a few time now.

If you can get user the car you'll quickly spot a broken actuator or fixing, if there is nothing obvious it could well be a broken baffle. (Sorry pictures don't work anymore due to photobucket)

Baffles are fixable but it's a bit of a faff.

http://911uk.com/viewtopic.php?t=98717&highlight=
 
  
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Shurv
Albert Park


Joined: 09 Jan 2013
Posts: 1709
Location: Northampton


PostPosted: Mon Jan 08, 2018 9:19 am    Post subject: Reply with quote

I had a load of rattling at low revs, especially under load, and since I changed my cats and boxes, it has gone away. My guess was the baffles in the exhaust had rotted away and were rattling around. These boxes rot from the inside out,so you can't see the state they are in,only hear it.
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pcat
Spa-Francorchamps


Joined: 16 Oct 2013
Posts: 281



PostPosted: Mon Jan 08, 2018 4:58 pm    Post subject: Reply with quote

leasky wrote:
pcat wrote:
I had this - turned out to be PSE actuator rod snapped leaving the butterfly valve flapping about inside


Was that an easy fix?

Colin.


OPC = 1500 quid for half a PSE system + labour
Indie = 100 quid welding job
 
  
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deMort
Reims


Joined: 21 Mar 2015
Posts: 4316
Location: Brighton


PostPosted: Mon Jan 08, 2018 7:41 pm    Post subject: Reply with quote

A picture of the brackets i think you have that cause problems ..

Ive bent away the one in the picture for the photo , normally you dont see the crack you lever bar it and find it that way.

Some can be welded and some are a bit more tricky to gain access .. bending the bracket away is also an option .
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TBE997
Silverstone


Joined: 19 Mar 2017
Posts: 112
Location: London


PostPosted: Wed Jan 10, 2018 7:33 pm    Post subject: Reply with quote

Thanks for all the replies.

I suspected that it might be one of the brackets, good that most agree based on the sound clip. Will probably try 9e and see if they can fix it

FYI, this is a Tubi aftermarket exhaust, didnt have the rattle with the original PSE, so some of clamps and brackets might have cracked/been damaged when the swapped the exhausts and cats.

Cheers
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TBE997
Silverstone


Joined: 19 Mar 2017
Posts: 112
Location: London


PostPosted: Sun Jan 14, 2018 4:59 pm    Post subject: Reply with quote

So after visiting 9e yesterday (great shop and Adam and Ken have been extremely helpful and caring, will definitely go there again) and getting the car up, it seems that the rattle is due to the connecting pipe between muffler and tips on the left sits on another exhaust pipe, which is likely to cause the rattle under low load (there are also marks on the lower pipe).

Left side (where they sit on top of each other)





Right side, the way it supposed to be




these pipes were not supplied by Tubi back then, so my options are either contacting Tubi (i bought the exhaust through scuderiaparts.com) or getting them custom made... will try option 1 first!

Brackets and clamps seem all seem ok..
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