Exhaust Poll

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.

synolimit · 10-16-2013, 11:46 PM

Quote:

Originally Posted by chii370

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.

Just google. It's also whats welded to the art motordyne test pipes, the guy you quoted...tony.

forza370z · 10-17-2013, 12:50 AM

Wow... Absolutely some good readings here!! I tend to agree with synolimit's theory on Helmholtz resonators. I thought they are mainly used to cancel out the drone, but this "restore air pressure" thing totally makes sense to me.

And that's why it makes the HKS Hi Power THE best exhaust out there because it has Helmholtz resonators!

JK JK...

I also agree with Chii on the exhaust piping diameter theory. The bigger piping and less restrictive exhaust systems aren't always good for NA cars. It's not like the bigger the better. It has a limit. I learned this in a hard way.

2.5 inch piping is close to the optimal for the NA setup on our car.

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

10-17-2013, 12:50 AM	#5 (permalink)
forza370z A True Z Fanatic Join Date: Oct 2011 Location: 403 Forbidden Posts: 2,512 Drives: 2009 NISMO 370Z Rep Power: 20	Wow... Absolutely some good readings here!! I tend to agree with synolimit's theory on Helmholtz resonators. I thought they are mainly used to cancel out the drone, but this "restore air pressure" thing totally makes sense to me. And that's why it makes the HKS Hi Power THE best exhaust out there because it has Helmholtz resonators! JK JK... I also agree with Chii on the exhaust piping diameter theory. The bigger piping and less restrictive exhaust systems aren't always good for NA cars. It's not like the bigger the better. It has a limit. I learned this in a hard way. 2.5 inch piping is close to the optimal for the NA setup on our car. __________________ 09 PW 370z Nismo \| K&N Drop Ins \| HKS Hi Power \| Berk HFCs \| Work Meister S1 3P \| Project Kics R40 Neo Chrome Lug Nuts \| KW V1 \| SPC rear camber arms/toe bolts \| Southbend Stage 3 daily clutch \| Southband 19Ib Steel Flywheel \| ZSpeed CSC

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10-16-2013, 10:59 PM	#1 (permalink)
chii370 Track Member Join Date: Jul 2010 Location: . Posts: 642 Drives: . Rep Power: 17	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	#3 (permalink)
chii370 Track Member Join Date: Jul 2010 Location: . Posts: 642 Drives: . Rep Power: 17	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.