Raspy, buzzing exhaust @2500-3000 rpm
#181
Registered User
Join Date: Jun 2004
Location: Florida
Posts: 41
Likes: 0
Received 0 Likes
on
0 Posts
Re: Raspy, buzzing exhaust @2500-3000 rpm
Originally posted by KISS
Does anyone else have this problem. I have Rt cats, JIC y-pipe and Magnaflow exhaust. The car sound fine but when I'm at 2500-3000 rpm's it buzzes. Sometimes I'll hear it on the highway at full throttle. I've heard some other Z owners have this problem.
Does anyone else have this problem. I have Rt cats, JIC y-pipe and Magnaflow exhaust. The car sound fine but when I'm at 2500-3000 rpm's it buzzes. Sometimes I'll hear it on the highway at full throttle. I've heard some other Z owners have this problem.
I just installed the Rt cats and it now has atasp to it @2500 to 3000 rpm. So probably the cats are the reason for the rasp wich is not a problem it only means you have not had your car tuned since you installed the cats. Reason being with high flow cats you have less back presure witch results in running rich and less HP.To get the most out of your mods for the z33 you must flash and tune your ECU . You can try TECHNOSQUARE.COM
#182
New Member
iTrader: (2)
Join Date: Jan 2003
Location: Keller, TX
Posts: 709
Likes: 0
Received 0 Likes
on
0 Posts
Re: Re: Raspy, buzzing exhaust @2500-3000 rpm
Originally posted by techz33
I just installed the Rt cats and it now has atasp to it @2500 to 3000 rpm. So probably the cats are the reason for the rasp wich is not a problem it only means you have not had your car tuned since you installed the cats. Reason being with high flow cats you have less back presure witch results in running rich and less HP.To get the most out of your mods for the z33 you must flash and tune your ECU . You can try TECHNOSQUARE.COM
I just installed the Rt cats and it now has atasp to it @2500 to 3000 rpm. So probably the cats are the reason for the rasp wich is not a problem it only means you have not had your car tuned since you installed the cats. Reason being with high flow cats you have less back presure witch results in running rich and less HP.To get the most out of your mods for the z33 you must flash and tune your ECU . You can try TECHNOSQUARE.COM
#183
Registered User
iTrader: (2)
Join Date: Mar 2004
Location: bradenton florida
Posts: 1,056
Likes: 0
Received 0 Likes
on
0 Posts
& so did i. i was the first person who ever mentioned the kinetix resonated test pipes(resonators in general actually). i even posted how they did the research & designed thier resonated pipes just for this reason. its funny, if you look back to when i first started replying you can see i was touching on this very issue but noone was listening. then when somone finally responded to what i was saying there was an argument about how wrong i was & thst there was still a major problem..........just funny how everyone is now going the resonator route, lol! im glad that somone had started applying thier own resonators to thier testpipes to save from overspending to eliminate the rasp. i still highly recommend the kinetix resonated pipes for those that have not went with test pipes yet. it will be about the same as if you purchase non resonated pipes & add your own resonators, just easier from the get go...............good luck!
-justin
-justin
#187
Registered User
iTrader: (2)
Join Date: Oct 2004
Location: San Diego, CA
Posts: 289
Likes: 0
Received 0 Likes
on
0 Posts
Well, although this is not related directly to the topic, I had a vibration coming from the rear of the car at around 1.8 - 2k after installing a y-pipe and resonated test pipes (stock exhaust). It also made some strange noises at higher RPM's under WOT. I later swapped the test pipes out for hi-flow cats (for other reasons) and the vibration was still there.
Well it turns out it was the thin flimsy V-shaped air shield that is bolted onto the stock muffler. Everything was nice and tight, but apparently it's so thin that it just naturally resonates at those frequencies or something...?
So I ripped it off and the sound is gone. I don't really think the shield did much for airflow anyway, the stock muffler is already pretty oval in shape, you would probably have to be going 150 for it to make much difference.
Well it turns out it was the thin flimsy V-shaped air shield that is bolted onto the stock muffler. Everything was nice and tight, but apparently it's so thin that it just naturally resonates at those frequencies or something...?
So I ripped it off and the sound is gone. I don't really think the shield did much for airflow anyway, the stock muffler is already pretty oval in shape, you would probably have to be going 150 for it to make much difference.
#188
Registered User
iTrader: (1)
Join Date: Apr 2004
Location: Florida
Posts: 878
Likes: 0
Received 0 Likes
on
0 Posts
You have any pics of that V shaped shield? Btw, what is "rasp"? I have a sound that sounds like a metal on metal vibration. This appeared with the install of my Stillen Test Pipes. Is this Rasp and would resonators cure them?
Also, where can I find a good muffler shop in FL?
Also, where can I find a good muffler shop in FL?
#190
Registered User
iTrader: (4)
Join Date: Jan 2003
Location: Schaumburg, IL
Posts: 601
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by 350Zenophile
I read all ten pages of this thread and I seem to be the only one with this setup...
TopSpeed Headers and Kinetix HF Cats.
I have the rasp at 3-4k rpm at WOT and wonder if anyone knows if replacing the HF Cats with resontated test pipes will improve or worsen this?
I read all ten pages of this thread and I seem to be the only one with this setup...
TopSpeed Headers and Kinetix HF Cats.
I have the rasp at 3-4k rpm at WOT and wonder if anyone knows if replacing the HF Cats with resontated test pipes will improve or worsen this?
#191
Registered User
iTrader: (41)
Originally posted by Z350Lover
don't know if anyone has brought this up... but in Nismo website, they put an end note at the end of their cats product page.... it says that their high flow cats will produce a metal rattle noise at around 3500 - 4000 rpm as well... and it is NORMAL!
so I guess most of the high flow cats will produce this kind of metal vibration due to the resonance....
cheers,
richie
don't know if anyone has brought this up... but in Nismo website, they put an end note at the end of their cats product page.... it says that their high flow cats will produce a metal rattle noise at around 3500 - 4000 rpm as well... and it is NORMAL!
so I guess most of the high flow cats will produce this kind of metal vibration due to the resonance....
cheers,
richie
If the very manufacturer of our cars says the rasp is normal with their very own hf cats, then there's not much more to be said, imo, other than to find a type/brand of rasp you can live with for the gains produced, and move on to cracking the great ecu mystery!
#195
Registered User
iTrader: (3)
Join Date: Apr 2006
Location: mcallen, tx
Posts: 130
Likes: 0
Received 0 Likes
on
0 Posts
i have topspeed headers and kinetix HFC..and i do have that metal on metal ringing at certain rpm's (3-4)..its damn annoying and im thinking bout putting my stock cats back on and seeing if the problem is solved..ill post when i do
#199
Hardest Setting
iTrader: (3)
Join Date: Feb 2008
Location: MexiCali dodging potholes
Posts: 13,406
Received 130 Likes
on
102 Posts
let's bump an old a$$ thread why don't we...
the clip below is of my Z with *AAM test pipes & y-pipe, stock mid-pipe without the resonator and stock muffler. So I've read this thread and it's the only one with a distinct title to my problem.
BUZZING!
I don't mind rasp however much but this buzzing noise is killing me...
I might have an exhaust leak, cause I was excited while installing it so I might not have tighten down everything. I removed the metal heat shields above the muffler and the two over the test pipes. There is one more over the mid-pipe, I'm planning to remove it as well seeing that it might be it vibrating...
So in short I think it might be either of the following with my setup.
- mid-pipe without the resonator
- last heat shield over the mid-pipe
- chambers in the muffler itself
really don't want to ditch this parts due to the sound...cause the instant felt change it power was great...
EDIT:
Also the buzzing is from the very rear no where near the test pipes.
the clip below is of my Z with *AAM test pipes & y-pipe, stock mid-pipe without the resonator and stock muffler. So I've read this thread and it's the only one with a distinct title to my problem.
BUZZING!
I don't mind rasp however much but this buzzing noise is killing me...
I might have an exhaust leak, cause I was excited while installing it so I might not have tighten down everything. I removed the metal heat shields above the muffler and the two over the test pipes. There is one more over the mid-pipe, I'm planning to remove it as well seeing that it might be it vibrating...
So in short I think it might be either of the following with my setup.
- mid-pipe without the resonator
- last heat shield over the mid-pipe
- chambers in the muffler itself
really don't want to ditch this parts due to the sound...cause the instant felt change it power was great...
EDIT:
Also the buzzing is from the very rear no where near the test pipes.
Last edited by KingBaby; 03-13-2011 at 08:06 AM.