!@#$%^ ark performance exhaust and dual chamber explained in detail

TeamARK · 01-27-2011, 06:44 PM

For you Physics guys, comments and suggestions are welcome.

Works cited:
Exhaust system - Wikipedia, the free encyclopedia
HowStuffWorks "How Mufflers Work"
Helmholtz resonance - Wikipedia, the free encyclopedia
http://www.paraglidingteam.nl/PPGTec...1155795969.pdf

TongMan · 01-27-2011, 07:53 PM

That is one detailed article.

Trips · 01-27-2011, 07:55 PM

My eyes started to hurt!!

Nice Job

XwChriswX · 01-27-2011, 08:07 PM

Based on the first pic there... Does this mean ARK is doing a shorty header as well?

Will these fit with stock Cats/aftermarket HFC's/Test pipes or ARK HFC's etc?

Haven't seen a thread on them so just wondering...

xsnapshot · 01-27-2011, 08:21 PM

First off, this makes the nerd in me get all excited.

A few quick constructive questions....

Question: If the exhaust is supposed to be reducing drone, of which complaints come from those experiencing it usually at lower RPM's, then why are you comparing the exhaust tone at 5000 RPM? Wouldn't a better test be where you hold the throttle constant at 1500/2000/2500/3000 RPM and then record the differences in decibel level between resonated and non-resonated?

To my ears it did sound less noisy at the very low RPM's and idle, but it was difficult to discern IMO. It would be interesting to take some in car audio samples of a resonator equipped Z cruising at 75mph and likewise with a non-resonator equipped Z. (or any two identical sporty cars for that matter)

Question 2: Underneath "ark performance resonators", the first paragraph:
"The resonator is designed to work best in the frequency range where the engine makes the most noise". Would the engine not make the most noise in the high RPM's at WOT, where the frequencies encountered might differ greatly from those at cruising RPM's? Thus wouldn't it be ideal to design the resonator towards those specific frequencies? I would think the resonator would work best at any RPM dominated by the frequency to which the resonator was designed.

Question 3: Just curious on your correlation of pipe diameter to the given ranges of Hp. I come from the Subaru realm where not much gain is to be had going from a 2.5" pipe to a 3" pipe (below about 400 crank hp), as long as the muffler designs are similar. 3" exhausts with straight through mufflers seem to work well for people all the way up to 600 crank horsepower. Still single exhaust. IMO a 4" exhaust recommendation for someone at 450 Hp seems like it might just add a lot of unnecessary weight and more area for heat transfer to occur.

Overall great presentation. I love the engineering side of it, and can tell your marketing people and your engineers must have a happy relationship.

XwChriswX · 01-27-2011, 08:28 PM

The most 'noise' I get from my exhaust is at 2000rpms... That's when the resonaton is really felt through the car.

Red__Zed · 01-27-2011, 10:44 PM

Great looking exhaust, neat little article.

Nice use of wikipedia math too

Junior370z · 01-27-2011, 10:59 PM

I bet if i bought this exhaust it would probably make me smarter lol!

VQinside · 01-30-2011, 08:30 PM

how much does it weigh?
how much does it cost?
how many HP do you get out of it?

'10Anamoly · 01-31-2011, 08:52 AM

Isn't it Helmholtz, not Hemholtz..? Great article, needs proofing though.

Sibze · 01-31-2011, 09:22 AM

wow, that was cool

xsnapshot · 01-31-2011, 11:18 AM

bump for answers to my questions....

Sibze · 01-31-2011, 11:24 AM

Quote:

Originally Posted by xsnapshot

bump for answers to my questions....

NO!

lol I'm not one to help, sorry dude

TeamARK · 01-31-2011, 02:57 PM

Quote:

Originally Posted by xsnapshot

First off, this makes the nerd in me get all excited.

A few quick constructive questions....

Question: If the exhaust is supposed to be reducing drone, of which complaints come from those experiencing it usually at lower RPM's, then why are you comparing the exhaust tone at 5000 RPM? Wouldn't a better test be where you hold the throttle constant at 1500/2000/2500/3000 RPM and then record the differences in decibel level between resonated and non-resonated?

To my ears it did sound less noisy at the very low RPM's and idle, but it was difficult to discern IMO. It would be interesting to take some in car audio samples of a resonator equipped Z cruising at 75mph and likewise with a non-resonator equipped Z. (or any two identical sporty cars for that matter)

Question 2: Underneath "ark performance resonators", the first paragraph:
"The resonator is designed to work best in the frequency range where the engine makes the most noise". Would the engine not make the most noise in the high RPM's at WOT, where the frequencies encountered might differ greatly from those at cruising RPM's? Thus wouldn't it be ideal to design the resonator towards those specific frequencies? I would think the resonator would work best at any RPM dominated by the frequency to which the resonator was designed.

Question 3: Just curious on your correlation of pipe diameter to the given ranges of Hp. I come from the Subaru realm where not much gain is to be had going from a 2.5" pipe to a 3" pipe (below about 400 crank hp), as long as the muffler designs are similar. 3" exhausts with straight through mufflers seem to work well for people all the way up to 600 crank horsepower. Still single exhaust. IMO a 4" exhaust recommendation for someone at 450 Hp seems like it might just add a lot of unnecessary weight and more area for heat transfer to occur.

Overall great presentation. I love the engineering side of it, and can tell your marketing people and your engineers must have a happy relationship.

Answer 1: We do test it at certain RPMS. However, you must take into account that its easier to hear or notice frequencies at a high range than low. This is because of how combustion engines function. It functions as a pulse. For during low RPM's it the gaps between the pulses are more apart than the pulses between high RPM.

Hopefully when do produce our next video, we will be able to show a picture in picture of the Speedometer.

Answer 2: Adding on to how I explained about the pulsing of the engine, We have to control the variables we have to work with to find the best range in frequencies to eliminate.

Variables . Size in piping, Piping diameter, thickness of pipes, size of perforation, size of chamber, thickness of chamber, placement of chamber, volume of the resonators.

Answer 3: This is subjective. We can only guess how big the piping diameter should be for best performance. You must take into account for where the testing is done as well. There is no best way to measure this. It all comes down to trial and error and the resources that each exhaust manufacturer has

01-27-2011, 06:44 PM	#1 (permalink)
TeamARK Track Member Join Date: Jul 2009 Location: CHINO Posts: 957 Drives: Black 350z/370z Rep Power: 17	!@#$%^ ark performance exhaust and dual chamber explained in detail For you Physics guys, comments and suggestions are welcome. Works cited: Exhaust system - Wikipedia, the free encyclopedia HowStuffWorks "How Mufflers Work" Helmholtz resonance - Wikipedia, the free encyclopedia http://www.paraglidingteam.nl/PPGTec...1155795969.pdf

01-27-2011, 07:55 PM	#3 (permalink)
Trips Administrator Join Date: May 2009 Location: Disneyland, Ca Posts: 8,732 Drives: 🔰 Rep Power: 10	My eyes started to hurt!! Nice Job __________________

01-27-2011, 08:07 PM	#4 (permalink)
XwChriswX WFLYIDNNE Join Date: Jul 2009 Location: In The Fastlane Posts: 50,648 Drives: 02 GDB WRX Rep Power: 452	Based on the first pic there... Does this mean ARK is doing a shorty header as well? Will these fit with stock Cats/aftermarket HFC's/Test pipes or ARK HFC's etc? Haven't seen a thread on them so just wondering... __________________ Bonnie - Stage 2, Audio build coming this fall! R.I.P. Abby 3/29/10 - 3/30/14

01-27-2011, 08:28 PM	#6 (permalink)
XwChriswX WFLYIDNNE Join Date: Jul 2009 Location: In The Fastlane Posts: 50,648 Drives: 02 GDB WRX Rep Power: 452	The most 'noise' I get from my exhaust is at 2000rpms... That's when the resonaton is really felt through the car. __________________ Bonnie - Stage 2, Audio build coming this fall! R.I.P. Abby 3/29/10 - 3/30/14

01-27-2011, 10:59 PM	#8 (permalink)
Junior370z A True Z Fanatic Join Date: Apr 2009 Location: Las Vegas Age: 50 Posts: 1,024 Drives: over the speed limit Rep Power: 293	I bet if i bought this exhaust it would probably make me smarter lol! __________________ DON'T DO IT! ( Click to show/hide ) Stillen CBECAI-U/D PulleyGround KitSwaysSetrab Oil CoolerIchiba Rear Camber KitAgility CoiloverBerk HFCTechnosquare TuneGT-R ButtonVenaci MeshSP Performance Cross Drilled/Slotted RotorsSPC Toe BoltsBomex LipMud flapsAero Jacket Type III WingSold

01-27-2011, 07:53 PM	#2 (permalink)
TongMan A True Z Fanatic Join Date: Feb 2010 Location: NorCal Posts: 1,297 Drives: 2013 Nissan GTR Rep Power: 715	That is one detailed article.

01-27-2011, 08:21 PM	#5 (permalink)
xsnapshot Base Member Join Date: Jan 2011 Location: Nebraska Posts: 21 Drives: 2004 WRX Rep Power: 14	First off, this makes the nerd in me get all excited. A few quick constructive questions.... Question: If the exhaust is supposed to be reducing drone, of which complaints come from those experiencing it usually at lower RPM's, then why are you comparing the exhaust tone at 5000 RPM? Wouldn't a better test be where you hold the throttle constant at 1500/2000/2500/3000 RPM and then record the differences in decibel level between resonated and non-resonated? To my ears it did sound less noisy at the very low RPM's and idle, but it was difficult to discern IMO. It would be interesting to take some in car audio samples of a resonator equipped Z cruising at 75mph and likewise with a non-resonator equipped Z. (or any two identical sporty cars for that matter) Question 2: Underneath "ark performance resonators", the first paragraph: "The resonator is designed to work best in the frequency range where the engine makes the most noise". Would the engine not make the most noise in the high RPM's at WOT, where the frequencies encountered might differ greatly from those at cruising RPM's? Thus wouldn't it be ideal to design the resonator towards those specific frequencies? I would think the resonator would work best at any RPM dominated by the frequency to which the resonator was designed. Question 3: Just curious on your correlation of pipe diameter to the given ranges of Hp. I come from the Subaru realm where not much gain is to be had going from a 2.5" pipe to a 3" pipe (below about 400 crank hp), as long as the muffler designs are similar. 3" exhausts with straight through mufflers seem to work well for people all the way up to 600 crank horsepower. Still single exhaust. IMO a 4" exhaust recommendation for someone at 450 Hp seems like it might just add a lot of unnecessary weight and more area for heat transfer to occur. Overall great presentation. I love the engineering side of it, and can tell your marketing people and your engineers must have a happy relationship.

01-27-2011, 10:44 PM	#7 (permalink)
Red__Zed A True Z Fanatic Join Date: Jul 2010 Location: window seat Posts: 28,940 Drives: Mostly on two wheels Rep Power: 120	Great looking exhaust, neat little article. Nice use of wikipedia math too

01-30-2011, 08:30 PM	#9 (permalink)
VQinside Base Member Join Date: Oct 2010 Location: Atlanta GA Posts: 109 Drives: 2010 370Z Rep Power: 15	how much does it weigh? how much does it cost? how many HP do you get out of it?

01-31-2011, 08:52 AM	#10 (permalink)
'10Anamoly Track Member Join Date: May 2010 Location: GA Posts: 882 Drives: 2010 370Z BS M6 Rep Power: 16	Isn't it Helmholtz, not Hemholtz..? Great article, needs proofing though. __________________ 2013 Ford Mustang GT 374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd

01-31-2011, 09:22 AM	#11 (permalink)
Sibze A True Z Fanatic Join Date: May 2009 Location: Ontario, Canada Posts: 16,202 Drives: In your way Rep Power: 63	wow, that was cool __________________ RIP Tony.

01-31-2011, 11:18 AM	#12 (permalink)
xsnapshot Base Member Join Date: Jan 2011 Location: Nebraska Posts: 21 Drives: 2004 WRX Rep Power: 14	bump for answers to my questions....

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