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Old 02-26-2004, 02:27   #1 (permalink)
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Resolving Exhaust Drone

Guys,

Interesting topic which im sure alot of guys suffer from. Ive done the exhaust system on my EL XR8 with Pacemekers into a Twin 2 1/4 system with twin hi-flow cats,
No X-pipe, Goes into a single 3" pipe over the diff and out to the rear. Got a Chrome twin type tip to make it look stock on the rear.

Now ive always suffered from some drone. The cars auto so that doesnt help. Got a resonator welded onto the 3" pipe tucked just under the bodykit behind the right rear wheel. Made differance in sound and quietened it down too but i still do get some drone in low revs. Kinda shits me but ive always put up with it.
Im not 100% what brand the mufflers are as i got the system done nearly 3 yrs ago. How can drone be overcome? Ive had heaps of comments on the exhaust setup and the way it looks is neat. Pitty i cant take some shots as i havnt a hoist. Do mufflers play a role in drone at all? From the setup i have you would think drone wouldnt occur but it does.

Anyone got any suggestions........
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Old 02-26-2004, 02:36   #2 (permalink)
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Re: Resolving Exhaust Drone

umm... i dont know much on it, but i found that installing my extractors removed the drone in my car.. but i've only got a 2.5" exhaust, with one muffler. and i got no idea what kind of muffler it is, but its quiet at idle.

for you tho, i think it'd be a muffler/resonator thing, where you need a resonator tuned for the frequency of sound of the drone.
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Old 02-26-2004, 04:22   #3 (permalink)
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Re: Resolving Exhaust Drone

Where abouts does the twin 2 1/4" pipes connect to make a 3" system. To stop the drone you need to change the 3" part to 2 1/2", or at least at the start of the 3" pipe, cut a 1 to 2 foot section out and replace it with a 2 1/2" piece. I know some quite a few people who have done this with good results.
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Old 02-26-2004, 04:29   #4 (permalink)
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Re: Resolving Exhaust Drone

Yeah basically the bigger the system the more drone there is I think. I have a bit of it at some of the rev range but otherwise it is burble the majority of the time (yum). I also have the same system as jmartion, single 2.5" with one muffler and hot dog.

I am also a youngen so too much noise doesn't bother me much atm but I guess I will get over it. :)
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Old 02-26-2004, 04:49   #5 (permalink)
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Re: Resolving Exhaust Drone

You're all soft! Just put some 3.7's or 3.9's in the diff and it'll rev a bit higher and you won't even notice it.
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Old 02-26-2004, 05:02   #6 (permalink)
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Re: Resolving Exhaust Drone

Try replacing the hot dog with a resonator or small muffler for a cheap fix.

To do it properly and make more rwkw, ditch the 2 into 1 3" bit including muffler & replace with twin system all the way with a balance pipe or x pipe if you can afford it, otherwise join the twin into 3" single after the rear axle. It will sound better/quieter and make more power. Stay with the twin tips as single tips tend to drone more. Do a before & after dyno to confirm the power increase that you will feel thru your seat. The area of a 3" pipe is much less than the total area of two 2 1/4" pipes. Remember area of a circle = pie r squared. Single 3" systems don't work for that reason!
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Old 02-26-2004, 05:51   #7 (permalink)
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Re: Resolving Exhaust Drone

Quote:
Originally Posted by shaynet
Try replacing the hot dog with a resonator or small muffler for a cheap fix.

To do it properly and make more rwkw, ditch the 2 into 1 3" bit including muffler & replace with twin system all the way with a balance pipe or x pipe if you can afford it, otherwise join the twin into 3" single after the rear axle. It will sound better/quieter and make more power. Stay with the twin tips as single tips tend to drone more. Do a before & after dyno to confirm the power increase that you will feel thru your seat. The area of a 3" pipe is much less than the total area of two 2 1/4" pipes. Remember area of a circle = pie r squared. Single 3" systems don't work for that reason!
Actually a 3" will flow more than a twin 2 1/4" system. Although the twin system has a slightly larger cross area, turbulent flow around the outside prevents it from flowing as well. Twin 2 1/4" flows about the same amount as a single 2 1/2" system.
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Old 02-26-2004, 14:11   #8 (permalink)
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Re: Resolving Exhaust Drone

No matter what you do you will always have a little bit of drone due to your auto, as other people have said, either go 3" all the way or twin 2 1/4 all the way with a X pipe.
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Old 02-26-2004, 17:37   #9 (permalink)
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Re: Resolving Exhaust Drone

Quote:
Originally Posted by EDXR8
Where abouts does the twin 2 1/4" pipes connect to make a 3" system. To stop the drone you need to change the 3" part to 2 1/2", or at least at the start of the 3" pipe, cut a 1 to 2 foot section out and replace it with a 2 1/2" piece. I know some quite a few people who have done this with good results.
It goes into a 3" single just over the diff and connects to it via a flange. I was thinking this too and changing this bit from 3" to 2 1/2 or even 2 1/4 then use a resonator too as the 3" had. I think at the moment the where it goes into a 3" pipe it is causing some drone
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Old 02-26-2004, 17:56   #10 (permalink)
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Re: Resolving Exhaust Drone

I find my 2.5" system with pacemakers is still droney. Im considering going 3" all the way thru with a straight thru muffler and about 1-2foot piece of pipe about 2.5" diam fitted between the y piece and muffler. I hear this practically gets rid of all the drone in a single system without feeling any loss in power.

Can anyone back me up on this?
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