Exhaust Rattle/weird Noise

[like_spike]

Hi Guys,

My exhaust is making some f**ked up sounds.

Between about 3200 and 3500rpm, the note coming from the exhaust is very very wrong. It almost sounds like a grinding noise.

It only happens while accelerating, and the sound is most noticeable in second gear.

Any ideas on what is up?

Scott

[R34_Wong]

Only when moving or does it do it when stationary?

Check the exhaust hangers and see if any of the flanges are grinding the underbody

Edited June 3, 2011 by R34_Wong

[Miguelone]

Could also be a broken baffle in your muffler or something.

[starwarz]

Rev it and see where the noise is comming from, mine was near the Cataytic converter so i figured it was stuffed.....turned out the component inside was loose so i replaced it....its sounded like metal grinding on cement.

[StevenCJR31]

yeah, i agree with the above, loose baffle in muffler syndrome

[Pal]

or poisoned cat

[Vermin]

Heat sheild for the exhaust before it hits the Cat??? Similar thing on my old Silvia. Just had it cut off. no real problems without it.

[SiNNO]

I've got the exact problem, happens around 3k - 3.5k rpm, only while accelerating, does not happen when it's in neutral.

Narrowed it down, and it seems to be coming from somewhere before the cat, hope someone could shed some light. Driving me insane lol

[gwin]

Just drop the whole exhaust and inspect... drive up on car ramps, shouldn't be too much of an issue for a weekend job, at least you'll start to eliminate possibilities

You'll be surprised on what you find, it's like a kinder surprise in there!

[NISMØ]

I swear to god this exact same question has been asked literally 100 times, why do people not use the search bar?

Here is a few threads that will tell you the same thing, terrible exhaust + twin cam N/A Rb engine (any of them) = rasp.

http://www.skylinesaustralia.com/forums/topic/261047-funny-sound-coming-out-of-the-exhaust/page__p__4477941__hl__exhaust+rasp__fromsearch__1#entry4477941

http://www.skylinesaustralia.com/forums/topic/258232-exhaust-clicking-noise/page__p__4452430__hl__exhaust+rasp__fromsearch__1#entry4452430

http://www.skylinesaustralia.com/forums/topic/246469-problems-with-exhaust-sound-r33-gts4/page__p__4294911__hl__exhaust+rasp__fromsearch__1#entry4294911

http://www.skylinesaustralia.com/forums/topic/197985-rasp/page__p__3552659__hl__exhaust+rasp__fromsearch__1#entry3552659

http://www.skylinesaustralia.com/forums/topic/304891-new-exhaust/page__hl__exhaust

http://www.skylinesaustralia.com/forums/topic/313221-buzzing-noise/page__p__5146577__hl__exhaust__fromsearch__1#entry5146577

[UWAM]

You need to replace your muffler bearing.

http://kalecoauto.com/index.php?main_page=product_info&cPath=3&products_id=10