Weird noise coming from my exhaust. Berk HFC and Magnaflow
03-16-2009, 09:18 AM
#91
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^ did you have the resonated X pipe so 11385 or 14385? Because while i was under the car I can hear the sound come from the Y pipe like where the gasses meet, so i'm guessing if we get a resonated one like the mufflers i mentioned it should muffle out the sound? because i know people with the FI exhaust + hfc dont have this problem. At least not when i ask them.
I dont want to sound like a d!ck but it seems as if the info we keep giving you is not being retained. To answer your question there is no resonated X-pipe/Y-pipe or any kind of crossover pipe. An exhaust does have resonators connected to a X/Y pipe. If you purchase an exhaust most chances it will be resonated.I also thought the noise was coming from the gaskets that meet the HFC and X-pipe but it's not.Once again i will tell you to read post 25 and 45 heck even read 68 to learn where the noise is coming from.
This is what an exhaust looks like. You can see the X-pipe up by the black bars (part of the lift) and the 2 shiny cans are the resonators.
<a href="http://s89.photobucket.com/albums/k212/Dipstix6996/Rides/G37S/Exhaust/?action=view¤t=IMG_0723.jpg" target="_blank"><img src="http://i89.photobucket.com/albums/k212/Dipstix6996/Rides/G37S/Exhaust/IMG_0723.jpg" border="0" alt="Photobucket"></a>
03-16-2009, 10:27 AM
#92
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I know and I've read the whole of this thread, and also all the other threads, but you can get a resonated/muffler with an Xpipe in it, The 2 parts I listed are just like that.
Look at the Fast intentions exhaust
That Thing in the middle is a magnaflow part, it's got an X pipe in it.
this is what it says on the Magnaflow website
Features and Benefits: Straight-Through Wide-Open Performance, Reversible, Tru-X Perforated Core, Lifetime Warranty, Dyno Tested And Proven To Make Power, Performance Gains In Horsepower And Torque, Great Sound - Has A Smooth Deep Tone, All Welded, Built To Last.
I've mentioning this because Last time i asked Blueslate if he had a sound like this with his FI HFCs and Exhaust he said no, maybe it's something else that FI did that got rid of this sound, but this is what I came up with.
Also it might be different on your car but with mine my pipes don't shake.
I know it might sound like I'm not listening/being difficult but it's because I want to find a solution to this. Also i said i think the sound it coming from the Y pipe where the 2 pipes meet so where the gases meet each other not at the gaskets, so there might not be a solution to this as it's just the type of resonance our engines make.
Look at the Fast intentions exhaust
That Thing in the middle is a magnaflow part, it's got an X pipe in it.
this is what it says on the Magnaflow website
Features and Benefits: Straight-Through Wide-Open Performance, Reversible, Tru-X Perforated Core, Lifetime Warranty, Dyno Tested And Proven To Make Power, Performance Gains In Horsepower And Torque, Great Sound - Has A Smooth Deep Tone, All Welded, Built To Last.
I've mentioning this because Last time i asked Blueslate if he had a sound like this with his FI HFCs and Exhaust he said no, maybe it's something else that FI did that got rid of this sound, but this is what I came up with.
Also it might be different on your car but with mine my pipes don't shake.
I know it might sound like I'm not listening/being difficult but it's because I want to find a solution to this. Also i said i think the sound it coming from the Y pipe where the 2 pipes meet so where the gases meet each other not at the gaskets, so there might not be a solution to this as it's just the type of resonance our engines make.
Last edited by Csquared; 03-16-2009 at 12:03 PM.
03-16-2009, 07:42 PM
#93
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C2, I just asked the question on another forum and was told an answer I never thought of before but makes perfect sense....
The hiss noise we're hearing on our cars is due to the excess gases flowing through the exhaust. When we add, Test Pipes, High Flow Cats and Cat Delete Pipes to our exhaust systems, we're placing our cars in a situation where a larger volume of air mass is now flowing through the exhaust upon acceleration and deceleration.
My hypothesis:
Under factory emissions regulation, a certain % of air is designed to flow from the motor's exhaust manifold, through the stock Catalytic Converter, burned, cleaned and forced out the Y Pipe, Mid pipe and out the mufflers into the air you and I breathe.
Since G35, 350z, G37s etc are Low Emission Vehicles, the stock cats have a major responsibility of not only burning off harmful carbons, but also controlling excess air mass that could potentially contain harmful carbons which could become potentially released into the atmosphere contributing to global pollution.
This is the reason why stock Cats are ALWAYS restrictive towards performance applications because as we all know the more air you can force into /out of an engine the better it performs.
What does this have to do with us?
Simple:
You, I and everyone who's decided we wanted to upgrade Cats to Higher Flowing Cats, Test Pipes, or Cat Delete Pipes chose to forgo the OEM's recommendation of restricted air mass aka our stock Catalytic Converter.
As a result, we experience more air flowing through our exhaust system and a slight boost in performance due to our now less restrictive exhaust system.
As a result, of the excess air mass that now flows through our Hi Flow Cats/Test Pipes and Cat Delete Pipes, we're hearing the result of that process.
Excess air mass = more gases flowing through our exhaust system.
The system has to regulate itself somehow. So now our HFCs etc are acting like blow off valves for turbo systems.
Relieving back pressure!
This is why a swap of a Y pipe may or may not solve the excess gas hiss sound.
Its also another reason why Dipstix checked and found all his pipes and bolts connected properly. There are no leaks in our systems.
The best way to test this is to have our car on a lift right. Have someone up there in the driver's chair revving the motor while we record and observe the sound the HFC/TP/CDPs are making and write down the area where the hiss sound is coming from.
I'm willing to bet its in the HFC/TP/CDP unit itself. Hope this helps! Feel free to add anything you see fit. We're finally getting somewhere
The hiss noise we're hearing on our cars is due to the excess gases flowing through the exhaust. When we add, Test Pipes, High Flow Cats and Cat Delete Pipes to our exhaust systems, we're placing our cars in a situation where a larger volume of air mass is now flowing through the exhaust upon acceleration and deceleration.
My hypothesis:
Under factory emissions regulation, a certain % of air is designed to flow from the motor's exhaust manifold, through the stock Catalytic Converter, burned, cleaned and forced out the Y Pipe, Mid pipe and out the mufflers into the air you and I breathe.
Since G35, 350z, G37s etc are Low Emission Vehicles, the stock cats have a major responsibility of not only burning off harmful carbons, but also controlling excess air mass that could potentially contain harmful carbons which could become potentially released into the atmosphere contributing to global pollution.
This is the reason why stock Cats are ALWAYS restrictive towards performance applications because as we all know the more air you can force into /out of an engine the better it performs.
What does this have to do with us?
Simple:
You, I and everyone who's decided we wanted to upgrade Cats to Higher Flowing Cats, Test Pipes, or Cat Delete Pipes chose to forgo the OEM's recommendation of restricted air mass aka our stock Catalytic Converter.
As a result, we experience more air flowing through our exhaust system and a slight boost in performance due to our now less restrictive exhaust system.
As a result, of the excess air mass that now flows through our Hi Flow Cats/Test Pipes and Cat Delete Pipes, we're hearing the result of that process.
Excess air mass = more gases flowing through our exhaust system.
The system has to regulate itself somehow. So now our HFCs etc are acting like blow off valves for turbo systems.
Relieving back pressure!
This is why a swap of a Y pipe may or may not solve the excess gas hiss sound.
Its also another reason why Dipstix checked and found all his pipes and bolts connected properly. There are no leaks in our systems.
The best way to test this is to have our car on a lift right. Have someone up there in the driver's chair revving the motor while we record and observe the sound the HFC/TP/CDPs are making and write down the area where the hiss sound is coming from.
I'm willing to bet its in the HFC/TP/CDP unit itself. Hope this helps! Feel free to add anything you see fit. We're finally getting somewhere
03-16-2009, 08:37 PM
#94
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[SIZE="4"]C2, I just asked the question on another forum and was told an answer I never thought of before but makes perfect sense....
The hiss noise we're hearing on our cars is due to the excess gases flowing through the exhaust. When we add, Test Pipes, High Flow Cats and Cat Delete Pipes to our exhaust systems, we're placing our cars in a situation where a larger volume of air mass is now flowing through the exhaust upon acceleration and deceleration.
The hiss noise we're hearing on our cars is due to the excess gases flowing through the exhaust. When we add, Test Pipes, High Flow Cats and Cat Delete Pipes to our exhaust systems, we're placing our cars in a situation where a larger volume of air mass is now flowing through the exhaust upon acceleration and deceleration.
03-16-2009, 08:48 PM
#95
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I had my car up on ramps and I reved the engine, I'm getting the sound at the Y pipe where the the 2 pipes meet at the pipe so where the gasses meet. No idea... But i know it's not counter weights like DipStix said because my pipes don't move at all.
So i figured its' just the resonance, i guess like Berk said.
So i figured its' just the resonance, i guess like Berk said.
03-16-2009, 09:01 PM
#96
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Yeah so i thought it was resonance like both you dipstix and the people from berk said but I think the sound is from when the gases mix, at the Y pipe, so if we used the muffled X pipe it might get rid of the sound?
03-16-2009, 09:52 PM
#97
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I think its a science fair project waiting to happen. Anyone willing to test it out for themselves?
C2 if you have your hands on an X pipe keep us posted. I want to see where this goes. Do you have any video clips of your findings?
C2 if you have your hands on an X pipe keep us posted. I want to see where this goes. Do you have any video clips of your findings?
03-16-2009, 10:01 PM
#99
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c2, you think the resonator might be it? The resonator's function is to muffle the loudness of your exhaust system. You can try but I doubt removing the resonators will stop the hiss
03-16-2009, 10:22 PM
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no not the resonators, i think it's coming from when the gases from both side of the engine meet, because for me the noise comes from the Y pipe. Like the middle of the Y and the magnaflow part is a resonator that has a X pipe inside it. So maybe if i change it to that the magnaflow part would muffle the sound that it's making. Do you understand where i'm going?
03-16-2009, 10:24 PM
#101
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here i'm talking about cutting off the Y pipe and putting this there.
http://www.planetmagnaflow.com/shop/...14385-330.html
http://www.planetmagnaflow.com/shop/...14385-330.html
03-17-2009, 10:58 PM
#102
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SO yeah I went a head cut off my resonators and my Y pipe installed the magnaflow 11385 which is an X pipe that is in a muffler/is a resonator, and On the acceleration front totally fixed the sound issue. I can only get this weird sound now only if i have it stationary in park then rev is hard to 3 k and let the revs drop, so jabbing at the gas peddle, then i get it. It's a lot softer and it's a slightly different tone. I was at HTP in MO worked with Matt, awesome guy, had it up on the lift for a hour trying to figure out the noise, did the install (Awesome welds btw) and then spent another hour trying to figure out the remaining noise, so it was way past closing time. In the end we couldn't figure out there it was coming from, seems to be the whole way down the pipe, so i'm guessing it's a resonance the engine makes. like i said only way to get it is to Jab at the throttle and it's at exactly 2.7-2.8 revs.
Other than that i'm happy with this mod, now i have a true dual and a sweet acceleration note.
Hope this helps, i'll post pics later.
Other than that i'm happy with this mod, now i have a true dual and a sweet acceleration note.
Hope this helps, i'll post pics later.
03-18-2009, 06:56 PM
#103
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C2 you know what this means...pics, vids and specs (including how much that magnaflow part and labor cost) haha
Thanks. I want to hear this. I spent a good part of today learning about this
Just imagine how amplified our HFC hiss sound would be if we had one of these installed on our cars....
See below
<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/356LMb9d10c&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/356LMb9d10c&hl=en&fs=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>
Thanks. I want to hear this. I spent a good part of today learning about this
Just imagine how amplified our HFC hiss sound would be if we had one of these installed on our cars....
See below
<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/356LMb9d10c&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/356LMb9d10c&hl=en&fs=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>
03-18-2009, 07:51 PM
#104
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Yeah I'll post pics any everything once i get back up to Wisc the thing is with the windows up and you're just driving around you dont' hear anything, i'm sure it's possible at certain times when you pull up next to some one they might hear it but they might think it's a blow off valve and be scared that you might have a turbo lol. my main goal was to get rid of the other sounds when i accelerate and this did it. Along with giving me a true dual setup.
03-19-2009, 12:09 AM
#105
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Well... I went to all this thread (very interested btw) because I have same "F" sound since I installed a borla cat back (OEM cats where not removed at that time). I called the shingle bells. Pay attention when driving next median barriers with windows down and,, wallaaa,, Santa Claus is some where with you. So, is NOT the addition of HFC what causes the sound. Then I installed Berk's HFC and the F.. sound was not intensify is the same. IMO the OEM exhaust was so well designed that took this out. The SS pipes used in after market exhaust may be more durable ect... but also more hard that may increase the HISS produced by the air flow. OEM steel pipes are a softer material that may attenuate the hiss sound. IF some one find a solution not altering gained performance please post it.