Fancy Tech: How to Get Rid of Exhaust Drone, works great!

TeamARK · 05-26-2011, 02:55 PM

What some of the guys are mentioning here is the incorporation of the quarter length pipe.

Length of pipe needed = Speed of sound / (4*/Frequency)

*4 is the factor for the quarter length

TeamARK · 05-26-2011, 02:56 PM

What some of the guys are mentioning here is the incorporation of the quarter length pipe.

Length of pipe needed = Speed of sound / (4*/Frequency)

*4 is the factor for the quarter length

'10Anamoly · 05-26-2011, 05:52 PM

Typically, 28-30" of length for each pipe will kill a lot of drone from 2300-2900rpms. Mine are 28".

6MT · 05-26-2011, 06:02 PM

And I thought a banana in the tail pipe cured all exhaust woes.

ka8 · 12-26-2011, 12:48 AM

Hello! Not to hijack a thread but...I searched google to fix drone in my Z32TT and somehow found this thread.

My setup is 3'' dp and 3''->2.5'' tp with 2.5'' Greddy SP exhaust. My butt-dyno is saying I gained about 30whp but I do have annoying drone at 2300rpm-2900rpm lol. I have to speed up to 75+ mph to quiet down drone.

Since exhaust diameter is different which diameter should I use for my setup? 2.5'' or 3''? Based on what I've read 28-30'' capped pipe sounds about right? Thanks in advance!

'10Anamoly · 12-26-2011, 03:18 PM

29" Capped tubes (one per side) at 2.5" each. The pipes need to mate to the exhaust at a 90 degree angle but the bends afterwards dont matter as long as the length and diameter are right.

'10Anamoly · 12-29-2011, 07:44 PM

Lemme know if that worked for you bud.

Cyberium · 12-29-2011, 09:07 PM

Cutting and welding sounds a bit too much... has anyone used Dynamat (or similar material) with F.I Catback to help kill the drone inside the cab? I could care less about it being loud outside =)

ka8 · 12-30-2011, 08:58 PM

Quote:

Originally Posted by '10Anamoly

Lemme know if that worked for you bud.

Just got this done today. But I was only able to squeeze in 20'' of piping because as you probably know already nothing's easy with Z32's. Well I thought I was going to go back to muffler shop but no need to. About 90% of drone is gone at cruising speeds. Just curious now is there any performance loss with this? I don't mind sacrificing 2-3whp for quiet cabin.

Here's my progress for reference.

https://www.300zxclub.com/showthread.php?t=202092

Thanks for your help.

'10Anamoly · 12-31-2011, 08:13 AM

Glad it helps! I am surprised that 20" helped but thats definately cool.

blazen · 03-02-2012, 05:22 PM

Just wondering, how long did the install take and how much did the shop charge you to do this?

Juice14 · 08-23-2012, 04:36 PM

so is it possible to fit a 12 in resonator on there?

'10Anamoly · 08-24-2012, 08:40 AM

Install took about 1.5 hours and cost me $220. No performance loss.

TeamARK · 08-24-2012, 02:37 PM

Another thing you guys should look into is widen the diameter for these helmholtz pipes. It covers a wider range in the area of where the drone occurs

boyboydan · 03-21-2013, 09:22 AM

Hi to all!

I went to do some experiment rite aft I read this post, because my muffler drone like hell at 1300-2500rpm!! My pipe is 2-1/2 inch and I had a 2" pipe weld side by side with the main pipe with the length about 1.3 meter. Unfortunately, it still drone at the same rpm.. is there anything else I could do??

Thx for the help!!

05-26-2011, 05:52 PM	#78 (permalink)
'10Anamoly Track Member Join Date: May 2010 Location: GA Posts: 882 Drives: 2010 370Z BS M6 Rep Power: 16	Typically, 28-30" of length for each pipe will kill a lot of drone from 2300-2900rpms. Mine are 28". __________________ 2013 Ford Mustang GT 374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd

05-26-2011, 06:02 PM	#79 (permalink)
6MT A True Z Fanatic Join Date: May 2009 Location: ITU Zone 2 Posts: 22,459 Drives: Reliant Robin Rep Power: 1790	And I thought a banana in the tail pipe cured all exhaust woes. __________________ Andrew 2009 370Z Sport/Touring 6MT sold 2013 Honda Civic Si coupe D/D

12-26-2011, 12:48 AM	#80 (permalink)
ka8 Base Member Join Date: Dec 2011 Location: SOCAL Posts: 2 Drives: Z32TT Rep Power: 14	Hello! Not to hijack a thread but...I searched google to fix drone in my Z32TT and somehow found this thread. My setup is 3'' dp and 3''->2.5'' tp with 2.5'' Greddy SP exhaust. My butt-dyno is saying I gained about 30whp but I do have annoying drone at 2300rpm-2900rpm lol. I have to speed up to 75+ mph to quiet down drone. Since exhaust diameter is different which diameter should I use for my setup? 2.5'' or 3''? Based on what I've read 28-30'' capped pipe sounds about right? Thanks in advance! Jorbes13 likes this.

12-26-2011, 03:18 PM	#81 (permalink)
'10Anamoly Track Member Join Date: May 2010 Location: GA Posts: 882 Drives: 2010 370Z BS M6 Rep Power: 16	29" Capped tubes (one per side) at 2.5" each. The pipes need to mate to the exhaust at a 90 degree angle but the bends afterwards dont matter as long as the length and diameter are right. __________________ 2013 Ford Mustang GT 374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd

12-29-2011, 07:44 PM	#82 (permalink)
'10Anamoly Track Member Join Date: May 2010 Location: GA Posts: 882 Drives: 2010 370Z BS M6 Rep Power: 16	Lemme know if that worked for you bud. __________________ 2013 Ford Mustang GT 374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd

05-26-2011, 02:55 PM	#76 (permalink)
TeamARK Track Member Join Date: Jul 2009 Location: CHINO Posts: 957 Drives: Black 350z/370z Rep Power: 17	What some of the guys are mentioning here is the incorporation of the quarter length pipe. Length of pipe needed = Speed of sound / (4/Frequency) 4 is the factor for the quarter length

05-26-2011, 02:56 PM	#77 (permalink)
TeamARK Track Member Join Date: Jul 2009 Location: CHINO Posts: 957 Drives: Black 350z/370z Rep Power: 17	What some of the guys are mentioning here is the incorporation of the quarter length pipe. Length of pipe needed = Speed of sound / (4/Frequency) 4 is the factor for the quarter length

12-29-2011, 09:07 PM	#83 (permalink)
Cyberium Enthusiast Member Join Date: Mar 2009 Location: Vermont Posts: 379 Drives: 370z Touring \| Sport Rep Power: 16	Cutting and welding sounds a bit too much... has anyone used Dynamat (or similar material) with F.I Catback to help kill the drone inside the cab? I could care less about it being loud outside =) __________________ Stillen G3 Intakes \| F. I TDX

12-31-2011, 08:13 AM	#85 (permalink)
'10Anamoly Track Member Join Date: May 2010 Location: GA Posts: 882 Drives: 2010 370Z BS M6 Rep Power: 16	Glad it helps! I am surprised that 20" helped but thats definately cool. __________________ 2013 Ford Mustang GT 374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd

03-02-2012, 05:22 PM	#86 (permalink)
blazen Base Member Join Date: Feb 2012 Location: nyc Posts: 1 Drives: 08 maxima Rep Power: 13	Just wondering, how long did the install take and how much did the shop charge you to do this?

08-23-2012, 04:36 PM	#87 (permalink)
Juice14 Base Member Join Date: Nov 2011 Location: International Posts: 132 Drives: Red 370Z Rep Power: 14	so is it possible to fit a 12 in resonator on there?

08-24-2012, 08:40 AM	#88 (permalink)
'10Anamoly Track Member Join Date: May 2010 Location: GA Posts: 882 Drives: 2010 370Z BS M6 Rep Power: 16	Install took about 1.5 hours and cost me $220. No performance loss. __________________ 2013 Ford Mustang GT 374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd

08-24-2012, 02:37 PM	#89 (permalink)
TeamARK Track Member Join Date: Jul 2009 Location: CHINO Posts: 957 Drives: Black 350z/370z Rep Power: 17	Another thing you guys should look into is widen the diameter for these helmholtz pipes. It covers a wider range in the area of where the drone occurs

03-21-2013, 09:22 AM	#90 (permalink)
boyboydan Base Member Join Date: Mar 2013 Location: hong kong Posts: 1 Drives: 370z Rep Power: 12	Hi to all! I went to do some experiment rite aft I read this post, because my muffler drone like hell at 1300-2500rpm!! My pipe is 2-1/2 inch and I had a 2" pipe weld side by side with the main pipe with the length about 1.3 meter. Unfortunately, it still drone at the same rpm.. is there anything else I could do?? Thx for the help!!

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