Exhaust really raspy at high RPM - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Jonnyblaze · 01-25-2009, 02:06 PM

Hey, I have a custom 3in catback with a Tanabe Hyper Medallion muffler on my ka24de and above 3k rpm the exhaust is really raspy and sounds pretty bad. My stock exhaust did this too. I'm positive my cat has shit the bed but do you think that is what's causing the sound?

Also, there's a rattling sound above 3k as well. Coming from underneath the car. What could that be?

origin_s135 · 01-25-2009, 02:49 PM

try 2.5"
YouTube - 240sx 2.5" Megan Racing Exhaust

rattling sound could be a hanger, did u look under the car while it's on?
maybe you have a leak somewhere?

BoostedCoupe · 01-25-2009, 03:04 PM

Rattlen could be a hanger, heat shield or many other things. It could be raspy for many diffrent reassons as well.
1. How was it bent? Was it scrushed or mandrel bent?
2. How and where does the catback bend? If it was ran just like the factory exhaust then thats your problem. Look at most aftermarket catbacks, they have as minimum bends as possible.

gyula hlavati · 01-25-2009, 03:14 PM

My cat made that sound when I bought my car.I switched it to testpipe and no noises after that.

Rapier46 · 01-25-2009, 06:46 PM

the sound and "raspiness" is ALL in the shape and resonation of the exhaust. removing cap could hlep, tyr taking out your cat and putting in a oval shaped resonator.

Jonnyblaze · 01-25-2009, 07:59 PM

Yeah, it's press bent and is run exactly like the stock exhaust. It was $45 so I'm not really complaining right now. But does the fact that the stock exhaust was really raspy as well mean that something else may be causing the sound?

DMaxUSA · 01-25-2009, 11:30 PM

It could be the construction of your 3" inch piping. If you had custom piping made, and welded on a universal muffler, then your exhaust would sound raspy if the airflow isnt smooth.

That's why so many Japanese companies charge more for exhausts. They actually engineer and test their exhaust for airflow and sound quality.

If your raspiness was always there, check your exhaust manifold as well as your cat/downpipe.

gun · 01-25-2009, 11:37 PM

^agree-gree^ check your downpipe. Also, make sure there are no gaps where flange meets flange, mine wasnt tight once and sounded like shit allll day until i found the prob, gl

astrophixvox · 01-25-2009, 11:48 PM

I had a washer moving around one time on my exhaust and made the whole thing sound like shit. It's probably something small. Get the car on a lift or get under some how and kinda shake things around. If not its your cat.

01-25-2009, 02:06 PM	#1
Jonnyblaze Zilvia Member Join Date: Feb 2007 Location: Oxnard, CA Posts: 262 Trader Rating: (1)	Exhaust really raspy at high RPM Hey, I have a custom 3in catback with a Tanabe Hyper Medallion muffler on my ka24de and above 3k rpm the exhaust is really raspy and sounds pretty bad. My stock exhaust did this too. I'm positive my cat has shit the bed but do you think that is what's causing the sound? Also, there's a rattling sound above 3k as well. Coming from underneath the car. What could that be? __________________ '91 Hatch - Work in Progress

01-25-2009, 02:49 PM	#2
origin_s135 Zilvia FREAK! Join Date: Dec 2006 Location: 湾区域 Posts: 1,348 Trader Rating: (1)	try 2.5" YouTube - 240sx 2.5" Megan Racing Exhaust rattling sound could be a hanger, did u look under the car while it's on? maybe you have a leak somewhere? __________________ -robo

01-25-2009, 03:04 PM	#3
BoostedCoupe Zilvia FREAK! Join Date: Nov 2006 Location: South Fulton, TN Age: 19 Posts: 1,031 Trader Rating: (3)	Rattlen could be a hanger, heat shield or many other things. It could be raspy for many diffrent reassons as well. 1. How was it bent? Was it scrushed or mandrel bent? 2. How and where does the catback bend? If it was ran just like the factory exhaust then thats your problem. Look at most aftermarket catbacks, they have as minimum bends as possible. __________________ 92 vert converted 5speed and other little things

01-25-2009, 06:46 PM	#5
Rapier46 Zilvia Member Join Date: Oct 2008 Location: Calgary Age: 19 Posts: 260 Trader Rating: (0)	the sound and "raspiness" is ALL in the shape and resonation of the exhaust. removing cap could hlep, tyr taking out your cat and putting in a oval shaped resonator. __________________ Left hand drive 240sx's ARE NOT SILVIAS.

01-25-2009, 07:59 PM	#6
Jonnyblaze Zilvia Member Join Date: Feb 2007 Location: Oxnard, CA Posts: 262 Trader Rating: (1)	Yeah, it's press bent and is run exactly like the stock exhaust. It was $45 so I'm not really complaining right now. But does the fact that the stock exhaust was really raspy as well mean that something else may be causing the sound? __________________ '91 Hatch - Work in Progress

01-25-2009, 03:14 PM	#4
gyula hlavati Leaky Injector Join Date: Sep 2006 Location: Jacksonville,Florida Age: 30 Posts: 108 Trader Rating: (4)	My cat made that sound when I bought my car.I switched it to testpipe and no noises after that.

01-25-2009, 11:30 PM	#7
DMaxUSA Zilvia Junkie Join Date: Jun 2008 Location: Torrance, CA Posts: 566 Trader Rating: (0)	It could be the construction of your 3" inch piping. If you had custom piping made, and welded on a universal muffler, then your exhaust would sound raspy if the airflow isnt smooth. That's why so many Japanese companies charge more for exhausts. They actually engineer and test their exhaust for airflow and sound quality. If your raspiness was always there, check your exhaust manifold as well as your cat/downpipe. __________________ d-maxusa.blogspot.com

01-25-2009, 11:37 PM	#8
gun Zilvia Junkie Join Date: Mar 2006 Location: Folsom Prison Posts: 431 Trader Rating: (1)	^agree-gree^ check your downpipe. Also, make sure there are no gaps where flange meets flange, mine wasnt tight once and sounded like shit allll day until i found the prob, gl __________________

01-25-2009, 11:48 PM	#9
astrophixvox Leaky Injector Join Date: Oct 2007 Location: Pharr, Tx Age: 25 Posts: 87 Trader Rating: (0)	I had a washer moving around one time on my exhaust and made the whole thing sound like shit. It's probably something small. Get the car on a lift or get under some how and kinda shake things around. If not its your cat. __________________

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