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.
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.
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.
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.
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!
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.
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.
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
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.
one thing i am gonna do is get flanges on where the muffler bolts in next time i replace exhaust.. that way i can swap mufflers easy if i dont like it.. (or remove for the strip)
next exhaust system i go for will be a twin 2¼ mild steel with an X pipe.
:edit: i am told that stainless is louder, which makes sense. but could it cause drone because of that?? my headers and Y pipe is stainless.. then it hits muffler. no drone.
The system for my EL 5.0l is pacemakers into twin 2.5" hi flow cats, then out through 2.5" pipes into a single 3" pipe into a 3" straight thru muffler out and over the diff in 3" pipe into a chambered 3" rear muffler with a very slight offset, then out with a 3" tip.
When the system was originally installed the drone was shocking. At that stage the rear muffler was just a resonator. Once I changed to the muffler I now have, the car was a little quieter and the drone no longer noticable. In my experience the louder the car is the worse the droning will be a single system.
Changing to the rear muffler cost me a little off-idle response, however it wasn't noticable over the rest of the rev range. More importantly the car became a pleasure to drive again.
My current system is:
Pacemaker headers, std cats and Y piece then mandrel bend 2 1/2 all the way out the back with 1 Lukey offset centre straight through muffler just before the diff bend. Sounds very quiet at idle, loud when under boot. Minimal drone but still lacks some woob woob.
Can anyone comment on a simple twin system. eg press bent twin 2 /4 from cats to tip with an auto?
i got no idea what system i have, its 2.5" non mandrel, with some kind of muffler.. but otherwise its the same as yours in being very quiet at idle, but loud when stoked.
actually i think theres a hole come through in my exhaust just near the diff.. been soundin louder lately..
not only that, i get nice pops n burbles in my exhaust when slowing down in lower gears.. adn when its coldish and i'm slowin down in 2nd or so, from 3 down to 1.5 grand, i'll get some nice snap crackle pop action comin outa my pipe.
i like it, and am not wanting to have to change, for fear of drone!!!
I've got a similar system on my ute (twin 2 1/4 into a 3 inch single) and the drone was unbearable when I had it installed (particularly below 2500 rpm). Took it back and had a crossover pipe fitted which improved the drone by 50%. Still drones a little but it's a more mellow drone and is now tolerable.
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