Stop the Drone - Helmholtz Style - Page 11 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Roger Ramjet · 09-30-2010, 04:24 PM

usmcjlp: Got Drone?

usmcjlp · 10-01-2010, 11:14 AM

I had the exhaust work done yesterday and am very happy with the results. Roger really hooked me up. For anyone who has issues with drone, this really works. I met him at a local shop in Lexington Park Maryland just outside Pax River. Rusty, who owns the shop, and his crew were great to work with. They were very professional and know their stuff

I had a set of Kooks resonators installed to bring the overall volume down. I also had a set of helmholtz pipes installed to eliminate a loud drone I picked up that seemed to center in between 1700-1800 rpm. Basically, the rpm band for cruising in 6th gear at 70-80 mph. The volume in the cabin is much lower, but the sound outside is still very aggressive. The entire cabin used to hum whenever the rpm was less than 2000. Now it is entirely gone in 1st through 5th. 6th is completely quiet except when accelerating uphill, but even then it is less than half the previous volume. Roger is confident that we can adjust the length of the tube to target the frequency. But to be honest, I was trying to make it drone. I normally would downshift in that situation. Here are some pictures that Roger provided.

First is the entire exhaust assembly. Then a close up of the Helmholtz pipes and the resonators installed on the car. The helmholtz pipes are forward facing but they sit higher than the bottom of the headers or suspension. They are also braced at the ends. I'm not sure if that is clear in the pictures. The resonators required a little modification to match up with the x-pipe and fit inside the tunnel.

MillerTime · 10-01-2010, 11:17 AM

I like! I will be doing this soon myself!

BigRed585Lbs · 10-01-2010, 12:56 PM

Outside the box? What box? I threw that thing away when the parts came in!

Wow! All of you really did a good job on that set-up. It's the first example I've seen of Helmholtz chambers that far up in the system. So it looks like they'll work anywhere there's room for the right length. Great job!!

4xchamp · 10-01-2010, 01:23 PM

Thanks , Roger .
http://www.camaro5.com/forums/showthread.php?t=108623

usmcjlp · 10-01-2010, 02:47 PM

Quote:

Originally Posted by BigRed585Lbs

Outside the box? What box? I threw that thing away when the parts came in!

Wow! All of you really did a good job on that set-up. It's the first example I've seen of Helmholtz chambers that far up in the system. So it looks like they'll work anywhere there's room for the right length. Great job!!

Yes, the helmholtz pipes will work regardless of where they are in the system. I was actually surprised when I contacted Pypes exhaust company and they recommended I place the resonators as far forward as possible.

zepcom · 10-02-2010, 07:14 AM

I like that unique chambers setup, however, it looks like it's possible that road debris or something could get "hooked on it" and cause damage to the rest of the exhaust system.

I once witnessed someone with an old pickup truck who had a rear pipe assembly hanging down and disconnnected (rusted out) in the front, and he hit a pothole with the hanging rear section, and it ripped off his right rear side of the axle, damaged the tire, as the rest of the exhaust bent away from the impact.

Hope this doesn't happen to you! Wonder if even a 'plate' near the tips of those chambers may deter something like this from happening.

BigRed585Lbs · 10-02-2010, 07:35 AM

That's the very reason I NEVER mount u-bolts or clamps with threads pointing in any direction but UP. Catch just one of those discarded plastic bags on one and you've got a melted plastic mess on your exhaust, not to mention the possibility of FIRE!

That's not a good burn-out!

NEGXXIS · 10-05-2010, 06:46 PM

Awesome ideas guys !!

I plan on trying this to my car pretty soon

MillerTime · 10-09-2010, 02:57 PM

Had this done yesterday. Works like a dream!!!

Roger Ramjet · 10-09-2010, 06:41 PM

Quote:

Originally Posted by MillerTime

Had this done yesterday. Works like a dream!!!

Where are the pix?

BigRed585Lbs · 10-09-2010, 07:09 PM

I can't see; I can't hear.

NEGXXIS · 10-20-2010, 11:12 AM

Finally started building my tubes last night.

Got it all finished and hope to drive it today and see how well it works

NEGXXIS · 10-28-2010, 11:10 AM

Well it worked GREAT !!

Mine were actually too long (33" on the long side and 28" on the short side) and it targeted the 1400 rpm range and still left the 1800-2000 rpm drone.

So I removed the mufflers again and cut 5" off the get the long side down to 28" and re-installed the mufflers.

Took it for a test drive and it was perfect !!

Like the other guys have said....it toned down the loudness of the exhuast system at idle and all the lower RPM ranges, but from around 3000 RPM and higher it still sounds very aggressive...just exactly how I wanted it to be.

BTW..my Exhaust is OBX longtubes with high flow metallic cats (3" inlet and outlet) and Flowmaster American Thunder Cat back
I also cutoff the 2.5" section on the flowmaster pipes where it connects to the factory cat pipes so that the whole exhaust system is 3" from the header collectors back.

09-30-2010, 04:24 PM	#141
Roger Ramjet Motor Head Drives: CTS-V Join Date: Feb 2009 Location: So MD Posts: 494	usmcjlp: Got Drone? __________________ History Camaro's: 83, 93, 95, 98, & 10.

10-01-2010, 11:14 AM	#142
usmcjlp Drives: 2SS/RS LS3 RJT Join Date: Jun 2009 Location: Northern Virginia Posts: 755	I had the exhaust work done yesterday and am very happy with the results. Roger really hooked me up. For anyone who has issues with drone, this really works. I met him at a local shop in Lexington Park Maryland just outside Pax River. Rusty, who owns the shop, and his crew were great to work with. They were very professional and know their stuff I had a set of Kooks resonators installed to bring the overall volume down. I also had a set of helmholtz pipes installed to eliminate a loud drone I picked up that seemed to center in between 1700-1800 rpm. Basically, the rpm band for cruising in 6th gear at 70-80 mph. The volume in the cabin is much lower, but the sound outside is still very aggressive. The entire cabin used to hum whenever the rpm was less than 2000. Now it is entirely gone in 1st through 5th. 6th is completely quiet except when accelerating uphill, but even then it is less than half the previous volume. Roger is confident that we can adjust the length of the tube to target the frequency. But to be honest, I was trying to make it drone. I normally would downshift in that situation. Here are some pictures that Roger provided. First is the entire exhaust assembly. Then a close up of the Helmholtz pipes and the resonators installed on the car. The helmholtz pipes are forward facing but they sit higher than the bottom of the headers or suspension. They are also braced at the ends. I'm not sure if that is clear in the pictures. The resonators required a little modification to match up with the x-pipe and fit inside the tunnel. Attached Images

10-01-2010, 11:17 AM	#143
MillerTime Blowin the doors off! Drives: A 2013 SS RS 6M SR Join Date: Apr 2010 Location: Phoenix, AZ Posts: 2,390	I like! I will be doing this soon myself! __________________ 2G1FS1EWXD9163847

10-01-2010, 01:23 PM	#145
4xchamp MURC 666 Drives: 69 Pace Car 68 Camaro Restomod 81 Z Join Date: Jan 2010 Location: New England , U.S.A. Posts: 480	Thanks , Roger . http://www.camaro5.com/forums/showthread.php?t=108623 __________________ Guys hoarding their Camaros are depriving some youngster the opportunity to restore it 25 years from now . Drive it like you stole it , let the next guy baby it !

10-02-2010, 07:14 AM	#147
zepcom Zeta Brother to Camaro Drives: 2009 Pontiac G8 GT Join Date: Oct 2009 Location: Buffalo NY Posts: 43 View My Garage	I like that unique chambers setup, however, it looks like it's possible that road debris or something could get "hooked on it" and cause damage to the rest of the exhaust system. I once witnessed someone with an old pickup truck who had a rear pipe assembly hanging down and disconnnected (rusted out) in the front, and he hit a pothole with the hanging rear section, and it ripped off his right rear side of the axle, damaged the tire, as the rest of the exhaust bent away from the impact. Hope this doesn't happen to you! Wonder if even a 'plate' near the tips of those chambers may deter something like this from happening. __________________ --zepcom 2009 Pontiac G8 GT SOLO Performance HF-Cats & SOLO Mach Unbalanced Catback with drone-free J-pipes

10-01-2010, 12:56 PM	#144
BigRed585Lbs Drives: Sierra and Tahoe Join Date: Jul 2010 Location: By Marion, MS Posts: 1,324 View My Garage	Outside the box? What box? I threw that thing away when the parts came in! Wow! All of you really did a good job on that set-up. It's the first example I've seen of Helmholtz chambers that far up in the system. So it looks like they'll work anywhere there's room for the right length. Great job!!

10-02-2010, 07:35 AM	#148
BigRed585Lbs Drives: Sierra and Tahoe Join Date: Jul 2010 Location: By Marion, MS Posts: 1,324 View My Garage	That's the very reason I NEVER mount u-bolts or clamps with threads pointing in any direction but UP. Catch just one of those discarded plastic bags on one and you've got a melted plastic mess on your exhaust, not to mention the possibility of FIRE! That's not a good burn-out!

10-05-2010, 06:46 PM	#149
NEGXXIS Drives: 2019 Camaro SS A10 Join Date: May 2009 Location: Tempe, Arizona Posts: 1,062 View My Garage	Awesome ideas guys !! I plan on trying this to my car pretty soon __________________ 2020 Range Rover Sport HSE P525 Supercharged 5.0 - Firenze Red - 9012 wheels SOLD 2019 Camaro SS -Wrapped in Matte Magnectic Black - Anderson Carbon Hood and Rear Spoiler – Ikon front spoiler – OEM ZL1 Side Rockers - ZL1 Addons Diffuser - BMR 1.0” Lowering Springs - MRR 228 Wheels 20x10 and 20x11 RIP 2016 Camaro SS https://www.camaro6.com/forums/showthread.php?t=565453 SOLD 2010 Camaro SS Featured in GM High Tech Performance and Camaro Now Magazines - http://www.superchevy.com/features/g...of-perfection/

10-09-2010, 02:57 PM	#150
MillerTime Blowin the doors off! Drives: A 2013 SS RS 6M SR Join Date: Apr 2010 Location: Phoenix, AZ Posts: 2,390	Had this done yesterday. Works like a dream!!! __________________ 2G1FS1EWXD9163847

10-09-2010, 07:09 PM	#152
BigRed585Lbs Drives: Sierra and Tahoe Join Date: Jul 2010 Location: By Marion, MS Posts: 1,324 View My Garage	I can't see; I can't hear.

10-20-2010, 11:12 AM	#153
NEGXXIS Drives: 2019 Camaro SS A10 Join Date: May 2009 Location: Tempe, Arizona Posts: 1,062 View My Garage	Finally started building my tubes last night. Got it all finished and hope to drive it today and see how well it works Attached Images __________________ 2020 Range Rover Sport HSE P525 Supercharged 5.0 - Firenze Red - 9012 wheels SOLD 2019 Camaro SS -Wrapped in Matte Magnectic Black - Anderson Carbon Hood and Rear Spoiler – Ikon front spoiler – OEM ZL1 Side Rockers - ZL1 Addons Diffuser - BMR 1.0” Lowering Springs - MRR 228 Wheels 20x10 and 20x11 RIP 2016 Camaro SS https://www.camaro6.com/forums/showthread.php?t=565453 SOLD 2010 Camaro SS Featured in GM High Tech Performance and Camaro Now Magazines - http://www.superchevy.com/features/g...of-perfection/ Last edited by NEGXXIS; 10-22-2010 at 11:14 AM.

10-28-2010, 11:10 AM	#154
NEGXXIS Drives: 2019 Camaro SS A10 Join Date: May 2009 Location: Tempe, Arizona Posts: 1,062 View My Garage	Well it worked GREAT !! Mine were actually too long (33" on the long side and 28" on the short side) and it targeted the 1400 rpm range and still left the 1800-2000 rpm drone. So I removed the mufflers again and cut 5" off the get the long side down to 28" and re-installed the mufflers. Took it for a test drive and it was perfect !! Like the other guys have said....it toned down the loudness of the exhuast system at idle and all the lower RPM ranges, but from around 3000 RPM and higher it still sounds very aggressive...just exactly how I wanted it to be. BTW..my Exhaust is OBX longtubes with high flow metallic cats (3" inlet and outlet) and Flowmaster American Thunder Cat back I also cutoff the 2.5" section on the flowmaster pipes where it connects to the factory cat pipes so that the whole exhaust system is 3" from the header collectors back. __________________ 2020 Range Rover Sport HSE P525 Supercharged 5.0 - Firenze Red - 9012 wheels SOLD 2019 Camaro SS -Wrapped in Matte Magnectic Black - Anderson Carbon Hood and Rear Spoiler – Ikon front spoiler – OEM ZL1 Side Rockers - ZL1 Addons Diffuser - BMR 1.0” Lowering Springs - MRR 228 Wheels 20x10 and 20x11 RIP 2016 Camaro SS https://www.camaro6.com/forums/showthread.php?t=565453 SOLD 2010 Camaro SS Featured in GM High Tech Performance and Camaro Now Magazines - http://www.superchevy.com/features/g...of-perfection/

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