Andy Posted August 15, 2007 Share Posted August 15, 2007 Hope you guys can help me here. When under acceleration going past 2.5k revs and coming back down through the rev range, again at 2.5k, I am getting a rather nasty metallic sounding rattle coming from what seems to be coming from somewhere near the front nearside wing. I spent the best part of 4 hours on Sunday investigating it, wondering if it was something like a loose CAI pipe or something but I can't find anything at all. The only thing I can think of is that one of my cats has broken down internally. The fact that is only happens at a certain rev range, to me, says it is either something loose and hence the resonance created at 2.5k is making it rattle or it is something to do with the exhaust gasses at that rev range, hence me thinking it is a cat but the noise seems too far forward in the engine for that!! I know it is a huge long shot with me saying "I have a rattle, what is it?" but I am hoping someone may have had something similar. The car is off the road at the moment until I have time to take the cats off an have a look at them but it's quite a long job!! Any help would be greatly appreciated! Cheers, Andy Quote Link to comment Share on other sites More sharing options...
live2themaxuk Posted August 16, 2007 Share Posted August 16, 2007 http://www.my350z.com/forum/showthread.php?t=258813 Quote Link to comment Share on other sites More sharing options...
Andy Posted August 16, 2007 Author Share Posted August 16, 2007 Thankyou so much for the link! Very useful indeed! Many thanks. Quote Link to comment Share on other sites More sharing options...
live2themaxuk Posted August 16, 2007 Share Posted August 16, 2007 no probs. had me stumped too. . . . . Quote Link to comment Share on other sites More sharing options...
Guest prescience Posted August 16, 2007 Share Posted August 16, 2007 Did I miss something I can't see that you got an answer except maybe its non-resonated test pipes? IMO if you have cats, it's the cat matrix Quote Link to comment Share on other sites More sharing options...
live2themaxuk Posted August 17, 2007 Share Posted August 17, 2007 bascially the rasp is characterisic of the engine/ exhaust setups. . .like on the BMW M3. . . you wont rid it very easily. . Quote Link to comment Share on other sites More sharing options...
GlenMH Posted August 17, 2007 Share Posted August 17, 2007 Ahh - that explains why the stealer couldn't find anything when I asked them to find the cause. I had run over a rock on an alpine pass when on holiday and was concerned I had dislodged something.... Glen Quote Link to comment Share on other sites More sharing options...
Guest prescience Posted August 17, 2007 Share Posted August 17, 2007 bascially the rasp is characterisic of the engine/ exhaust setups. . .like on the BMW M3. . . you wont rid it very easily. . I had the same set-up as Andy though, NISMO and hi-flows and definitely no rasp? Quote Link to comment Share on other sites More sharing options...
Andy Posted August 17, 2007 Author Share Posted August 17, 2007 The Plenum certainly gives off a rasp but this is definatley not right and shouldn't be there!!! Quote Link to comment Share on other sites More sharing options...
Guest prescience Posted August 17, 2007 Share Posted August 17, 2007 The Plenum certainly gives off a rasp but this is definatley not right and shouldn't be there!!! I assume you have adjusted the tower bar, this does foul the Kinetix plenum and cause a noise, because I had this myself - it needs to be raised. In fact my tip would be to temporarily remove the tower bar and run the car around to see if the noise disappears, then you know it's down to adjustment Quote Link to comment Share on other sites More sharing options...
live2themaxuk Posted August 17, 2007 Share Posted August 17, 2007 make a sound clip of it. There are clips of the sound that i had are on my350z.com Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.