07 HR Exhaust Buzzing around 2K RPMs - Nissan 350Z Forum, Nissan 370Z Tech Forums
User Tag List

 
LinkBack Thread Tools Search this Thread
post #1 of 2 (permalink) Old 03-22-2017, 01:29 PM Thread Starter
Base Member
 
Join Date: Feb 2017
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
07 HR Exhaust Buzzing around 2K RPMs

I have seen a lot of threads regarding exhaust vibration/buzz/hiss after adding high flow cats but I dont really see any definitive answers on how to eliminate it. So far I went and had a resonator added right behind the factory resonator, did nothing. I checked and/or removed any heat shield that might be vibrating and have checked every inch of the exhaust for leaks or weak links. It seems to be the worst when I am driving normally, particularly when I take off or when I let off the throttle, sounds like a Honda Civic with a tin can muffler. Sounds great at idle, nice low rumble and also sounds good when I gun it. The noise does sound like it may be coming from the y-pipe or possibly the flex pipe on the passenger side but I cant really find any leaks of vibrations there, kind of a whisping sound in that area. So now, my last resort is to have a small turbo muffler welded in place of the factory resonator before going back to factory cats. I know I may lose a little bit of mid/top end due to the addition of a little back pressure but I dont race it so Im ok with that, I just want it to sound good, right now it sounds cheap. I've had cars with rasp before, this doesnt sound like rasp, it sounds like crap, lol. Before I do this I had a couple of questions that Im hoping someone might can help out on.

1) Has anyone else tried this and if so did it work.
2) Is there any chance of creating issues due to the added back pressure of the muffler replacing the straight through resonator. (running rich/heat/etc)
350GC is offline  
Sponsored Links
Advertisement
 
post #2 of 2 (permalink) Old 03-24-2017, 09:55 AM Thread Starter
Base Member
 
Join Date: Feb 2017
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
I got a glass pack installed in place of the factory resonator, actually made it sound a little more aggressive, did nothing for the buzz. I was worried the turbo muffler idea might create too much back pressure. When I got home from the exhaust shop I got back under the car and removed the heat shield around the junction point of the y pipe where the pipes go from 2 to 1 and the buzzing got worse...ah-ha! Im on to something, the buzzing seems to be the y pipe resonating. I plan to insulate the y pipe this evening with exhaust wrap, may even double wrap it.
350GC is offline  
Sponsored Links
Advertisement
 
Reply

Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
Replace with
For the best viewing experience please update your browser to Google Chrome