Exhaust Poll

synolimit · 10-16-2013, 12:57 PM

Where's the custom poll button

Quote:

Originally Posted by Sh0velMan

That percentage is grossly incorrect, as 99% of the forum will be in excess of 124,000 people, and FI to date has shipped under 1000 units.

Also, it's popular because it's the best exhaust offered for this car.

I think you win with custom! I know you said you have insane rasp. We'll I did too with LTH but after a fix, no more rasp and it's all custom done be me. You should really fix yours!!

Sh0velMan · 10-16-2013, 01:20 PM

Quote:

Originally Posted by synolimit

Where's the custom poll button

I think you win with custom! I know you said you have insane rasp. We'll I did too with LTH but after a fix, no more rasp and it's all custom done be me. You should really fix yours!!

Nothing to fix brosef.

Exhaust rasp is about the least offensive noise my car makes... lmao.

synolimit · 10-16-2013, 01:30 PM

Quote:

Originally Posted by Sh0velMan

Nothing to fix brosef.

Exhaust rasp is about the least offensive noise my car makes... lmao.

Wow I'd kill myself if I thought rasp was a good thing. Might be the most ghetto, cheap, horrible sound a car could make. Rasp to me would be like people who say "you spent $30k plus on a car, do it right and don't cheap out." I'm not saying your header back is cheap but for a free fix it could be what its supposed to sound like.

snowsurfdirtx · 10-16-2013, 01:32 PM

Quote:

Originally Posted by synolimit

Wow I'd kill myself if I thought rasp was a good thing. Might be the most ghetto, cheap, horrible sound a car could make. Rasp to me would be like people who say "you spent $30k plus on a car, do it right and don't cheap out." I'm not saying your header back is cheap but for a free fix it could be what its supposed to sound like.

LOL guess you should never buy and modify a Porsche then.

synolimit · 10-16-2013, 03:10 PM

Quote:

Originally Posted by snowsurfdirtx

LOL guess you should never buy and modify a Porsche then.

Well I have a fix but he don't want it. I'm sure there's a way for them too.

Sh0velMan · 10-16-2013, 10:11 PM

I think.... I think you guys don't really "get it" when it comes to my car.

Maybe if you saw and heard it in person? I think you have this impression that the car sounds like a small displacement Honda 4 cylinder with a straight pipe on it...

It doesn't.

Is there rasp? Yes, I can detect the sound of the rasp amid the other exhaust noises, but it definitely doesn't sound like yard equipment.

I mean, I've posted a video in my build thread of revving the damned thing, if all you hear in that sound clip is rasp, then I can't help you. My car is loud and in your face, and if people are laughing at the way it sounds, well, good for them. I'm glad I could give them something to laugh about.

And what's this about power? I'm losing power because I don't have extra pipes hanging off of my exhaust? Do you just make this stuff up as you go along? lmao. Do you even understand what causes the rasp? The mere act of acoustically cancelling out the pulses that generate the rasp can cause back pressure in the exhaust system. You're far more likely to see a power dip at specific RPMs WITH extra resonating chambers attached than you are with a straight pipe as 'canceling out the rasp' is breaking up an acoustic wavefront that helps with scavenging. I assume you know what that is, at least, and why you would not want to do so? This is exactly why you have to be careful with resonance alterations that close to the engine and why I will do no such thing.

THAT is fact, THAT is science. I don't want to make this an acoustics and fluid dynamics debate thread, it's already ridiculous enough.

chii370 · 10-16-2013, 10:19 PM

rasp isnt that weed whacker buzz noise. thats just ..... shitty sounding exhaust. you only hear rasp when you let off the gas JUST as the rpms are about to the 1k-500 level.

heres a raspy **** example. Nismo 370z with ARK high flow cats and ARK DTS exhaust with techno tips - YouTube

heres a non raspy **** example of the same exhaust

ARK Performance Nissan 370z DT-S Exhaust - YouTube

listen for when the engine RPM's drop from rev, to almost idle. its that noise thats like someone sticking there toung out and blowing.

and good for you, you get a bro high five. im not lecturing you about THIS car. Im lecturing you about ALL cars. physics just so happen to apply to all of them. just sayin. so stop acting like a know it all and do the research for yourself. Im sure for your super ultra 1337 "in your mind" build only useful on a track that about 2% of the community would ever care to do will be awesome. but im talking about the real world, where dyno numbers arent the only thing that matters about owning a vehicle that most of us drive daily. derp

Chuck33079 · 10-16-2013, 10:22 PM

Quote:

Originally Posted by chii370

rasp isnt that weed whacker buzz noise. thats just ..... shitty sounding exhaust. you only hear rasp when you let off the gas JUST as the rpms are about to the 1k-500 level.

heres a raspy **** example. Nismo 370z with ARK high flow cats and ARK DTS exhaust with techno tips - YouTube

heres a non raspy **** example of the same exhaust

ARK Performance Nissan 370z DT-S Exhaust - YouTube

listen for when the engine RPM's drop from rev, to almost idle. its that noise thats like someone sticking there toung out and blowing.

Are we discussing rasp, or the "VQ hiss"?

Sh0velMan · 10-16-2013, 10:23 PM

Quote:

Originally Posted by Chuck33079

Are we discussing rasp, or the "VQ hiss"?

rofl

chii370 · 10-16-2013, 10:29 PM

wow theres an aweful lot of other cars besides Z's and G's that must use the VQ then. I should go inform them that we have solved it. its gotta be the "VQ hiss" since its obviously the only engine ever made that does it. trademark that ****. I get whats being refered too as rasp here now, the annoying buzz fart can sound? never really put a word to it. just **** exhaust. my bad there.

and just sayin, I care about that. as well as any other annoying/bad noise an exhaust makes. regardless of your reasoning, point is gaining a little HP and making your car sound like **** is a giant fail imo.

Sh0velMan · 10-16-2013, 10:23 PM

Quote:

Originally Posted by chii370

rasp isnt that weed whacker buzz noise. thats just ..... shitty sounding exhaust. you only hear rasp when you let off the gas JUST as the rpms are about to the 1k-500 level.

heres a raspy **** example. Nismo 370z with ARK high flow cats and ARK DTS exhaust with techno tips - YouTube

heres a non raspy **** example of the same exhaust

ARK Performance Nissan 370z DT-S Exhaust - YouTube

.. are... are you serious?

This entire time, you think we're talking about the HR/VHR 'hiss'????

That's a phenomena that's been around since the HR and is caused by the VVT system on the exhaust side.... You can get rid of that by running a simple resonator (glass pack) in the exhaust stream.

The grown ups are talking about exhaust rasp during WOT use caused by supersonic wave fronts within the exhaust stream as the exhaust valves open.

At least, this grown up is. I respect Synolimit's grounding in the subject, so I am assuming he is referring to the same thing.

Not the stupid hiss. Who cares about that ****.

synolimit · 10-16-2013, 10:48 PM

Quote:

Originally Posted by Sh0velMan

I think.... I think you guys don't really "get it" when it comes to my car.

Maybe if you saw and heard it in person? I think you have this impression that the car sounds like a small displacement Honda 4 cylinder with a straight pipe on it...

It doesn't.

Is there rasp? Yes, I can detect the sound of the rasp amid the other exhaust noises, but it definitely doesn't sound like yard equipment.

I mean, I've posted a video in my build thread of revving the damned thing, if all you hear in that sound clip is rasp, then I can't help you. My car is loud and in your face, and if people are laughing at the way it sounds, well, good for them. I'm glad I could give them something to laugh about.

And what's this about power? I'm losing power because I don't have extra pipes hanging off of my exhaust? Do you just make this stuff up as you go along? lmao. Do you even understand what causes the rasp? The mere act of acoustically cancelling out the pulses that generate the rasp can cause back pressure in the exhaust system. You're far more likely to see a power dip at specific RPMs WITH extra resonating chambers attached than you are with a straight pipe as 'canceling out the rasp' is breaking up an acoustic wavefront that helps with scavenging. I assume you know what that is, at least, and why you would not want to do so? This is exactly why you have to be careful with resonance alterations that close to the engine and why I will do no such thing.

THAT is fact, THAT is science. I don't want to make this an acoustics and fluid dynamics debate thread, it's already ridiculous enough.

Well I have LTH also so I know what It sounds like. It was nothing but rasp as I'm sure yours is also. Reving a car doesn't count. I heard yours under load and my statement stands.

If you have rasp you're losing power, period. Read Chii post again. All that is from Tony at motordyne. Do you think tony makes more power with his ART pipes and CBE over straight pipes and other CBE because he lucky? No he's not lucky. He's smart and combated the rasp and drone with a proper setup using Helmholtz resonators which you don't have and I do. Guess what? I don't rasp or drone ever, and to boot because of the way a Helmholtz works with storing air pressure and acting as a vacuum when the flow has a gap in it, I bet I make more power than you too. The fact that you're talking about back pressure automatically makes you unqualified for this conversation. You need to read more and learn.

PS your science is wrong because your source you got it from don't have an understanding and years after years people are just passing BS along and down the line.

chii370 · 10-16-2013, 10:59 PM

well your right about one thing shov. a resonator too close is bad, but a resonator further down stream is not, where it helps create a negative pressure zone. You would also want it as far away from the originating source anyway to help dissipate the sound waves before they even GET to the resonators for frequency cancel. So I see no reason at all why it would rob power unless its improperly designed with too little flow, too little velocity, or improperly shaped entry and exit to the resonating chamber that causes turbulence. I would like to see something to back that claim up, as in my personal experience thats just not true. cats sure, resonators, no.

synolimit · 10-16-2013, 11:12 PM

Quote:

Originally Posted by chii370

well your right about one thing shov. a resonator too close is bad, but a resonator further down stream is not, where it helps create a negative pressure zone. You would also want it as far away from the originating source anyway to help dissipate the sound waves before they even GET to the resonators for frequency cancel. So I see no reason at all why it would rob power unless its improperly designed with too little flow, too little velocity, or improperly shaped entry and exit to the resonating chamber that causes turbulence. I would like to see something to back that claim up, as in my personal experience thats just not true. cats sure, resonators, no.

But you do realize a Helmholtz isn't an inline resonator right? Two different things.

chii370 · 10-16-2013, 11:22 PM

no idea what Helmholtz is, was just speaking from a general standpoint. wasnt arguing with you, was arguing with shovelman. but it must be said that both parties are right on various points. Im saying this through a mostly lifetime of experience of being involved with building cars since i was old enough for my dad to force his mechanical way of life on me. not just from 100 dyno runs with a Z. these principles apply to every car, its science/physics as we have both stated. If you wanna make a useless million HP noisebox go right ahead, by all means its your right to do so. But passing on your dumbfuck logic to people who DONT understand the science behind it will cause people to follow in your tracks unknowingly and be disappointing in the results for their daily driving car. theres a difference between doing things the right way, and doing things the 1% way that also just so happens to work. dont know about you, but im humble enough to say i learned something today.

View Poll Results: Which exhaust do you have or recommend I get???
Stillen	34	14.29%
FI	108	45.38%
ARK	31	13.03%
Berk	30	12.61%
Invidia	35	14.71%
Voters: 238. You may not vote on this poll

10-16-2013, 10:11 PM	#6 (permalink)
Sh0velMan A True Z Fanatic Join Date: Jan 2012 Location: Dallas/Ft.Worth Posts: 3,349 Drives: Noisily. Rep Power: 21	I think.... I think you guys don't really "get it" when it comes to my car. Maybe if you saw and heard it in person? I think you have this impression that the car sounds like a small displacement Honda 4 cylinder with a straight pipe on it... It doesn't. Is there rasp? Yes, I can detect the sound of the rasp amid the other exhaust noises, but it definitely doesn't sound like yard equipment. I mean, I've posted a video in my build thread of revving the damned thing, if all you hear in that sound clip is rasp, then I can't help you. My car is loud and in your face, and if people are laughing at the way it sounds, well, good for them. I'm glad I could give them something to laugh about. And what's this about power? I'm losing power because I don't have extra pipes hanging off of my exhaust? Do you just make this stuff up as you go along? lmao. Do you even understand what causes the rasp? The mere act of acoustically cancelling out the pulses that generate the rasp can cause back pressure in the exhaust system. You're far more likely to see a power dip at specific RPMs WITH extra resonating chambers attached than you are with a straight pipe as 'canceling out the rasp' is breaking up an acoustic wavefront that helps with scavenging. I assume you know what that is, at least, and why you would not want to do so? This is exactly why you have to be careful with resonance alterations that close to the engine and why I will do no such thing. THAT is fact, THAT is science. I don't want to make this an acoustics and fluid dynamics debate thread, it's already ridiculous enough. __________________ Buy My Car! \| Build Thread

10-16-2013, 10:19 PM	#7 (permalink)
chii370 Track Member Join Date: Jul 2010 Location: . Posts: 642 Drives: . Rep Power: 16	rasp isnt that weed whacker buzz noise. thats just ..... shitty sounding exhaust. you only hear rasp when you let off the gas JUST as the rpms are about to the 1k-500 level. heres a raspy ** example. Nismo 370z with ARK high flow cats and ARK DTS exhaust with techno tips - YouTube heres a non raspy ** example of the same exhaust ARK Performance Nissan 370z DT-S Exhaust - YouTube listen for when the engine RPM's drop from rev, to almost idle. its that noise thats like someone sticking there toung out and blowing. and good for you, you get a bro high five. im not lecturing you about THIS car. Im lecturing you about ALL cars. physics just so happen to apply to all of them. just sayin. so stop acting like a know it all and do the research for yourself. Im sure for your super ultra 1337 "in your mind" build only useful on a track that about 2% of the community would ever care to do will be awesome. but im talking about the real world, where dyno numbers arent the only thing that matters about owning a vehicle that most of us drive daily. derp Last edited by chii370; 10-16-2013 at 10:24 PM.

10-16-2013, 10:29 PM	#10 (permalink)
chii370 Track Member Join Date: Jul 2010 Location: . Posts: 642 Drives: . Rep Power: 16	wow theres an aweful lot of other cars besides Z's and G's that must use the VQ then. I should go inform them that we have solved it. its gotta be the "VQ hiss" since its obviously the only engine ever made that does it. trademark that **. I get whats being refered too as rasp here now, the annoying buzz fart can sound? never really put a word to it. just exhaust. my bad there. and just sayin, I care about that. as well as any other annoying/bad noise an exhaust makes. regardless of your reasoning, point is gaining a little HP and making your car sound like ** is a giant fail imo. Last edited by chii370; 10-16-2013 at 10:33 PM.

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10-16-2013, 10:59 PM	#13 (permalink)
chii370 Track Member Join Date: Jul 2010 Location: . Posts: 642 Drives: . Rep Power: 16	well your right about one thing shov. a resonator too close is bad, but a resonator further down stream is not, where it helps create a negative pressure zone. You would also want it as far away from the originating source anyway to help dissipate the sound waves before they even GET to the resonators for frequency cancel. So I see no reason at all why it would rob power unless its improperly designed with too little flow, too little velocity, or improperly shaped entry and exit to the resonating chamber that causes turbulence. I would like to see something to back that claim up, as in my personal experience thats just not true. cats sure, resonators, no.

10-16-2013, 11:22 PM	#15 (permalink)
chii370 Track Member Join Date: Jul 2010 Location: . Posts: 642 Drives: . Rep Power: 16	no idea what Helmholtz is, was just speaking from a general standpoint. wasnt arguing with you, was arguing with shovelman. but it must be said that both parties are right on various points. Im saying this through a mostly lifetime of experience of being involved with building cars since i was old enough for my dad to force his mechanical way of life on me. not just from 100 dyno runs with a Z. these principles apply to every car, its science/physics as we have both stated. If you wanna make a useless million HP noisebox go right ahead, by all means its your right to do so. But passing on your dumbfuck logic to people who DONT understand the science behind it will cause people to follow in your tracks unknowingly and be disappointing in the results for their daily driving car. theres a difference between doing things the right way, and doing things the 1% way that also just so happens to work. dont know about you, but im humble enough to say i learned something today.

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