Posted: Sun Jan 07, 2018 8:55 pm Post subject: Exhaust Rattle Sound
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:
Joined: 09 Jan 2013 Posts: 1725 Location: Northampton
Posted: Mon Jan 08, 2018 9:19 am Post subject:
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. _________________ 996 C4S Arctic Silver Black leather
Joined: 16 Oct 2013 Posts: 314
Posted: Mon Jan 08, 2018 4:58 pm Post subject:
I had this - turned out to be PSE actuator rod snapped leaving the butterfly valve flapping about inside
Was that an easy fix?
OPC = 1500 quid for half a PSE system + labour
Indie = 100 quid welding job
Joined: 21 Mar 2015 Posts: 5154 Location: Brighton
Posted: Mon Jan 08, 2018 7:41 pm Post subject:
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 . _________________
7pm - 9pm
At an Indy these days !
Joined: 19 Mar 2017 Posts: 127 Location: London
Posted: Wed Jan 10, 2018 7:33 pm Post subject:
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.
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!
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