AAM Short Tails Exhaust Question

kbc749 · 05-03-2016, 11:17 PM

Hello,

So I have the typhoon intakes, upper intake manifold Berk HFC, and as of yesterday the AAM Short Tails.

So anyone who has these Short tails knows there is a large drone from 3-4k RPM. And what I'd like someone who understands it better to explain to me is how does the drone occur? Like is the sound echoing through the pipes and resonating at some frequency that magnifies it? or what happens?

TLDR; why is it that I get loud noises from 1-2k, quiet from 2-3k, loud from 3-4k, and then back to quiet (relatively) all the way to redline? Like what is the process that causes this fluctuation?

Thanks,

KBC749

2011 Nismo#91 · 05-04-2016, 08:23 AM

Resonance and fundamental frequencies. The tube length is fixed but the frequency of pulses, air velocities, and pressure all vary so you get many different resonances and volumes.

https://en.wikipedia.org/wiki/Acoustic_resonance

Joey370Z · 05-05-2016, 10:11 AM

I bought resonated AAM short tails.. very worth it, no annoying sounds with a perfect roar.

SS_Firehawk · 05-05-2016, 10:54 AM

How did u buy them resonated

FPenvy · 05-05-2016, 11:32 AM

Quote:

Originally Posted by SS_Firehawk

How did u buy them resonated

he bought them lol

AAM Competition - Nissan GT-R, 370Z Turbo Performance Specialists

SS_Firehawk · 05-05-2016, 12:09 PM

**********!?!?! Son of a bitch!

N1SMOZ · 05-05-2016, 01:48 PM

I got Z1 test pipes with AAM Short Tails. Love it.

Joey370Z · 05-07-2016, 08:07 AM

Haha I actually contacted AAM to ask for them before they put them on the website. They just added the Resonated short tails on the website a few weeks ago but I've had mine on my car for at least a month now and I LOVE them. Sound is perfect. Now I have never heard the non resonated tails in person so I'm at a disadvantage. But I'm Also buying the motordyne ART test pipes today.

05-03-2016, 11:17 PM	#1 (permalink)
kbc749 Base Member Join Date: Jan 2015 Location: Columbus Ohio Posts: 161 Drives: 2010 370z 6MT Rep Power: 10	AAM Short Tails Exhaust Question Hello, So I have the typhoon intakes, upper intake manifold Berk HFC, and as of yesterday the AAM Short Tails. So anyone who has these Short tails knows there is a large drone from 3-4k RPM. And what I'd like someone who understands it better to explain to me is how does the drone occur? Like is the sound echoing through the pipes and resonating at some frequency that magnifies it? or what happens? TLDR; why is it that I get loud noises from 1-2k, quiet from 2-3k, loud from 3-4k, and then back to quiet (relatively) all the way to redline? Like what is the process that causes this fluctuation? Thanks, KBC749 __________________ 2010 Black Cherry 370Z Admin 3" intakes, Motordyne LTH, ART Pipes, AAM Catback, Z1 Anti Starve Kit, and some other stuff too

05-05-2016, 10:11 AM	#3 (permalink)
Joey370Z Base Member Join Date: Jan 2016 Location: Sarasota, Florida Posts: 95 Drives: 2010 370Z 40th ANNIV Rep Power: 9	I bought resonated AAM short tails.. very worth it, no annoying sounds with a perfect roar. __________________ 2010 40th Anniversary 6MT \| Motordyne shockwave catback \| Motordyne ART test pipes \| Stillen Gen 3's

05-05-2016, 10:54 AM	#4 (permalink)
SS_Firehawk Premium Member Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7334	How did u buy them resonated __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction

05-05-2016, 12:09 PM	#6 (permalink)
SS_Firehawk Premium Member Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7334	********!?!?! Son of a bitch! jaytirbhaw and 2011 Nismo#91 like this. __________________ Old Car:GTM TSC'd** 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction

05-07-2016, 08:07 AM	#8 (permalink)
Joey370Z Base Member Join Date: Jan 2016 Location: Sarasota, Florida Posts: 95 Drives: 2010 370Z 40th ANNIV Rep Power: 9	Haha I actually contacted AAM to ask for them before they put them on the website. They just added the Resonated short tails on the website a few weeks ago but I've had mine on my car for at least a month now and I LOVE them. Sound is perfect. Now I have never heard the non resonated tails in person so I'm at a disadvantage. But I'm Also buying the motordyne ART test pipes today. cameronZ likes this. __________________ 2010 40th Anniversary 6MT \| Motordyne shockwave catback \| Motordyne ART test pipes \| Stillen Gen 3's

05-04-2016, 08:23 AM	#2 (permalink)
2011 Nismo#91 A True Z Fanatic Join Date: Mar 2011 Location: NJ Posts: 2,381 Drives: slowly Rep Power: 33858	Resonance and fundamental frequencies. The tube length is fixed but the frequency of pulses, air velocities, and pressure all vary so you get many different resonances and volumes. https://en.wikipedia.org/wiki/Acoustic_resonance

05-05-2016, 01:48 PM	#7 (permalink)
N1SMOZ Base Member Join Date: Oct 2015 Location: Woodbridge,VA Age: 30 Posts: 62 Drives: 12 370z Nismo BS 6MT Rep Power: 9	I got Z1 test pipes with AAM Short Tails. Love it.

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