FUG Posted September 24, 2013 Share Posted September 24, 2013 Hi guys noticing a rattling noise when coming down the revs , not sure if it's coming from under the car or wheels , typically rev along in 2nd or 3rd up to 4k and let the revs come back down and can hear it for a few seconds , doesn't seem to make the noise when stationary though?? Any ideas ?? Quote Link to comment Share on other sites More sharing options...
ianphampton Posted September 24, 2013 Share Posted September 24, 2013 Is yours an aftermarket or stock exhaust? I have a Crapspeed K2 zorst and mine rattles a bit when cold, disappears when warmed up - perhaps yours is loose baffle or something? Quote Link to comment Share on other sites More sharing options...
FUG Posted September 24, 2013 Author Share Posted September 24, 2013 I have a milltek system , standard cats ? Is it fairly straight forward to check / change baffles ? Expensive ? The noise has only appeared recently and makes the noise when cold or hot Quote Link to comment Share on other sites More sharing options...
Hooch Posted September 24, 2013 Share Posted September 24, 2013 Exhaust heat shields? I have heard that stones can easily get caught in one of the mid heat shields above the exhaust, could be that? Quote Link to comment Share on other sites More sharing options...
deankenny Posted September 25, 2013 Share Posted September 25, 2013 MY recently sold 350z rattle on the down revs also, only did it when after i fitted a Stillen Y-Pipe, which does not have the flexi Quote Link to comment Share on other sites More sharing options...
FUG Posted September 27, 2013 Author Share Posted September 27, 2013 The garage I spoke to seemed to think it may be oil starvation?? The dip stick is such a shite design IMO it wasnt until the 5th attempt smear free where it may potentially be low , had a full oil change not so long ago though... :/ Quote Link to comment Share on other sites More sharing options...
deankenny Posted September 27, 2013 Share Posted September 27, 2013 The garage I spoke to seemed to think it may be oil starvation?? The dip stick is such a shite design IMO it wasnt until the 5th attempt smear free where it may potentially be low , had a full oil change not so long ago though... :/ Not heard that one before Quote Link to comment Share on other sites More sharing options...
peteman35 Posted September 27, 2013 Share Posted September 27, 2013 Cat heat shields mine did it ripped one off it stopped. Now the other has started so that one will be beaten to death as well. Simple job just takes patience Quote Link to comment Share on other sites More sharing options...
WINKJ Posted September 28, 2014 Share Posted September 28, 2014 Sorry for the thread revival, however I have recently fitted a stillen cat back exhaust and I now have a terrible rattle/bang when the exhaust it warmed up. Not got a clue what it is and it's been driving me nuts all day. Just can't seem to spot it and sort it!!! A lot of the U.S. forums suggest that the exhaust is hitting the Crossbrace but I seem to have enough clearance... Quote Link to comment Share on other sites More sharing options...
Lexx Posted September 28, 2014 Share Posted September 28, 2014 It may look like enough clearance, but if you give a good yank down on the exhaust it could hit it. I had the same issue on the RX8 with an aftermarket exhaust. I just spaced the cross brace with a few washers. Solved it. Quote Link to comment Share on other sites More sharing options...
WINKJ Posted September 28, 2014 Share Posted September 28, 2014 It may look like enough clearance, but if you give a good yank down on the exhaust it could hit it. I had the same issue on the RX8 with an aftermarket exhaust. I just spaced the cross brace with a few washers. Solved it. Thanks lexx, does the fact that it only seems to be when its hot make a difference? Quote Link to comment Share on other sites More sharing options...
comrade Posted September 28, 2014 Share Posted September 28, 2014 Lift the car up and bang on the exhaust with something soft to make it vibrate, you will tell straight away where the rattle is coming from. Mine was due to the cat heatshields being so rusted that they were pretty much not there anymore. Quote Link to comment Share on other sites More sharing options...
WINKJ Posted September 28, 2014 Share Posted September 28, 2014 Also been pulling it around etc... No sounds or movement at all Quote Link to comment Share on other sites More sharing options...
WINKJ Posted September 28, 2014 Share Posted September 28, 2014 (edited) Lift the car up and bang on the exhaust with something soft to make it vibrate, you will tell straight away where the rattle is coming from. Mine was due to the cat heatshields being so rusted that they were pretty much not there anymore. The car is pretty much brand new!!! Will give it a go Just tried... No luck. It's more of a clunk than a rattle too. Also sounds like a scraping clunk when taking a hard left turn!! Very odd. The When th car is hot it does it even going slow in a straight line on any small bump Edited September 28, 2014 by WINKJ Quote Link to comment Share on other sites More sharing options...
GIXXERUK Posted September 28, 2014 Share Posted September 28, 2014 (edited) The only movement the exhaust shouldl get is from the engine mounts Have you checked all the rubber hangers are still in place Esp. The two hangers that stick out after the mid pipe silencers Edited September 28, 2014 by GIXXERUK Quote Link to comment Share on other sites More sharing options...
comrade Posted September 28, 2014 Share Posted September 28, 2014 Lift the car up and bang on the exhaust with something soft to make it vibrate, you will tell straight away where the rattle is coming from. Mine was due to the cat heatshields being so rusted that they were pretty much not there anymore. The car is pretty much brand new!!! Will give it a go Just tried... No luck. It's more of a clunk than a rattle too. Also sounds like a scraping clunk when taking a hard left turn!! Very odd. The When th car is hot it does it even going slow in a straight line on any small bump Oh, i didn't realise that yours is a 370. Even the newest 350s will have rust underneath by now Are you sure that it is the exhaust that it is clunking? Did the noise appear straight away after fitting it? Did you change anything else on the car at the same time? Quote Link to comment Share on other sites More sharing options...
WINKJ Posted September 28, 2014 Share Posted September 28, 2014 Lift the car up and bang on the exhaust with something soft to make it vibrate, you will tell straight away where the rattle is coming from. Mine was due to the cat heatshields being so rusted that they were pretty much not there anymore. The car is pretty much brand new!!! Will give it a go Just tried... No luck. It's more of a clunk than a rattle too. Also sounds like a scraping clunk when taking a hard left turn!! Very odd. The When th car is hot it does it even going slow in a straight line on any small bump Oh, i didn't realise that yours is a 370. Even the newest 350s will have rust underneath by now Are you sure that it is the exhaust that it is clunking? Did the noise appear straight away after fitting it? Did you change anything else on the car at the same time? Nope just the exhaust. I think I may know what the problem is. When you fit the stillen you have to remove a bracket which is specific to the nismo exhaust to make it line up. As a result the nut sits higher than it would normally. Which is rubbing against the nismo ARB. (I think it is called a that). Normally it would sit lower due to the bracket. Which may also explain the noise when turning left!!! So the solutin would be to fit a nut that isn't as long. Popping back to the garage to see if they can sort it.. Hopefully won't charge me!!!! Quote Link to comment Share on other sites More sharing options...
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