Exhaust Noise Solution
#1
Exhaust Noise Solution
Hello Everyone
After do lots and lots of searching, with no answer, I'm now reaching out for help.
I installed Reso Test Pipes, Magnaflow X, and X02 catback. I've gotten the nasty whistle explained.......
http://www.zcar.com/forums/read/5/1805863
and
https://my350z.com/forum/intake-exha...oll-video.html
Has anyone come to a definitive solution to this problem? or does anyone have any suggestions to fix this?
**Edit**
I've already got new gaskets in place, I just need to know if I need to get my hands on anything else to get rid of the sound.
After do lots and lots of searching, with no answer, I'm now reaching out for help.
I installed Reso Test Pipes, Magnaflow X, and X02 catback. I've gotten the nasty whistle explained.......
http://www.zcar.com/forums/read/5/1805863
and
https://my350z.com/forum/intake-exha...oll-video.html
Has anyone come to a definitive solution to this problem? or does anyone have any suggestions to fix this?
**Edit**
I've already got new gaskets in place, I just need to know if I need to get my hands on anything else to get rid of the sound.
Last edited by Chi-TownWarrior; 11-02-2009 at 10:22 AM.
#5
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I got it fixed with the Magnaflow X-pipe installed. However, it is not really a fix, it just silence the whistle noise with the build-in resonator. I can still hear it slightly under full throttle, but still much better than before.
In your case, if it is still very loud. Check carefully for exhaust leak or any damaged/cracked exhaust components first. Also, make sure all the welds are good, *sometime* the muffler exhaust may missed a spot and causing the exhaust leak.
In your case, if it is still very loud. Check carefully for exhaust leak or any damaged/cracked exhaust components first. Also, make sure all the welds are good, *sometime* the muffler exhaust may missed a spot and causing the exhaust leak.
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#8
I got it fixed with the Magnaflow X-pipe installed. However, it is not really a fix, it just silence the whistle noise with the build-in resonator. I can still hear it slightly under full throttle, but still much better than before.
In your case, if it is still very loud. Check carefully for exhaust leak or any damaged/cracked exhaust components first. Also, make sure all the welds are good, *sometime* the muffler exhaust may missed a spot and causing the exhaust leak.
In your case, if it is still very loud. Check carefully for exhaust leak or any damaged/cracked exhaust components first. Also, make sure all the welds are good, *sometime* the muffler exhaust may missed a spot and causing the exhaust leak.
Thanks.
#10
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I believe the hissing is due to turbulence in the exhaust caused by different piping diameters.
I've got the same sound when the revs drop from 2.5k to 2k rpms with HFCs on stock exhaust
I've got the same sound when the revs drop from 2.5k to 2k rpms with HFCs on stock exhaust
#11
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I only know what I have tried myself. Hope this helps:
TPs + stock y-pipe + stock mid pipe + Greddy SE = very raspy
TPs + xyz-pipe w/res + stock mid pipe + Greddy SE= Rasp
HFCs + xyz y-pipe w/res + stock mid pipe + Greddy SE= No rasp but too quiet
HFCs + xyz y-pipe w/straight pipe + stock mid pipe + Greddy SE= Almost no rasp and best combo so far for me. Still fairly quiet at high speed yet deep at low speed.
I think RAYZ33 is right "...caused by different piping diameters" ...
My midpipe (2.75") and Greddy SE (2.5") may need to go. I kinda want to get a 3" exhaust from the y-pipe all the way to the back. But now I just want a 40" LCD tv... So for now Yoshimi will have to wait.
TPs + stock y-pipe + stock mid pipe + Greddy SE = very raspy
TPs + xyz-pipe w/res + stock mid pipe + Greddy SE= Rasp
HFCs + xyz y-pipe w/res + stock mid pipe + Greddy SE= No rasp but too quiet
HFCs + xyz y-pipe w/straight pipe + stock mid pipe + Greddy SE= Almost no rasp and best combo so far for me. Still fairly quiet at high speed yet deep at low speed.
I think RAYZ33 is right "...caused by different piping diameters" ...
My midpipe (2.75") and Greddy SE (2.5") may need to go. I kinda want to get a 3" exhaust from the y-pipe all the way to the back. But now I just want a 40" LCD tv... So for now Yoshimi will have to wait.
#12
Thanks for the responses everyone.
I just ordered a few things I'm going to try with a shop local to me. Once everything comes in and I get to work, I'll post my results. I've ordered new flanges, new flex pipe, and all new gaskets. I'm going to get to the bottom of this.
I just ordered a few things I'm going to try with a shop local to me. Once everything comes in and I get to work, I'll post my results. I've ordered new flanges, new flex pipe, and all new gaskets. I'm going to get to the bottom of this.
#13
**UPDATE**
Well the solution has been found. It's simple...............
Have the flex pipes removed, and just have the person weld in a regular pipe. That removed the loud whistling noise I was experiencing at 2k RPM when the engine was down revving.
I did however take a look inside the flex pipe, and it seems to have a liner like the flex pipe that is suggested. I'll post pics of that if needed.
Well the solution has been found. It's simple...............
Have the flex pipes removed, and just have the person weld in a regular pipe. That removed the loud whistling noise I was experiencing at 2k RPM when the engine was down revving.
I did however take a look inside the flex pipe, and it seems to have a liner like the flex pipe that is suggested. I'll post pics of that if needed.
#16
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**UPDATE**
Well the solution has been found. It's simple...............
Have the flex pipes removed, and just have the person weld in a regular pipe. That removed the loud whistling noise I was experiencing at 2k RPM when the engine was down revving.
I did however take a look inside the flex pipe, and it seems to have a liner like the flex pipe that is suggested. I'll post pics of that if needed.
Well the solution has been found. It's simple...............
Have the flex pipes removed, and just have the person weld in a regular pipe. That removed the loud whistling noise I was experiencing at 2k RPM when the engine was down revving.
I did however take a look inside the flex pipe, and it seems to have a liner like the flex pipe that is suggested. I'll post pics of that if needed.
i was going to recommend wrapping your flex bung things heavily with some 30 $ exhaust wrap but you got it.
#17
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Wouldn't completely replacing the flex pipes eventually cause cracking at flanges and such? Since it can't "flex" at those joints when the car is under load and there's torque applied from the engine....
(Same concept as to why people request HFC's or TP's with mounting brackets welded on)
(Same concept as to why people request HFC's or TP's with mounting brackets welded on)
#18
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Wouldn't completely replacing the flex pipes eventually cause cracking at flanges and such? Since it can't "flex" at those joints when the car is under load and there's torque applied from the engine....
(Same concept as to why people request HFC's or TP's with mounting brackets welded on)
(Same concept as to why people request HFC's or TP's with mounting brackets welded on)
#19
Wouldn't completely replacing the flex pipes eventually cause cracking at flanges and such? Since it can't "flex" at those joints when the car is under load and there's torque applied from the engine....
(Same concept as to why people request HFC's or TP's with mounting brackets welded on)
(Same concept as to why people request HFC's or TP's with mounting brackets welded on)
I've gotten extra flanges, and got some better quality flex pipe, so if something breaks, I can fix it.
Last edited by Chi-TownWarrior; 11-07-2009 at 07:07 PM.
#20
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idk but if you look at the exhaust design i beleive the whistling noise is caused by that tube that runs up to the back part of the muffler. where it bends and goes up. try seeing if you can stuff a towl in it and see if it goes away. i hated the way it did that when i had my hks. but im pretty sure thats where it comes from.