Got bullets? Got Drone? Look in here!
Got bullets? Got Drone? Look in here! I was having a problem with horrible drone. My td's consisted of Hooker lt's 3" td's with a H pipe and dynomax bullets dumped at the rear axle.
I was getting drone at about 1600-1800 rmp which was about 40-50 mph (most speed limits) and it was driving me crazy. I decided to do something about it the other day and was looking to install some under the axle pipe and extend it out the back.
I cut off the turndowns and plotted out my idea. I was all set to go to the auto parts store when I started my car to drive down my ramps. It sounded much deeper and interior drone was way way down. I took it for a spin and it sounded great! Almost no drone at all at cruise speeds. Even wot sounded better. I'm still going to extend it out the back but not because of drone, I just like how it looks more with pipes out the back.
Hope this helps someone out.
I was getting drone at about 1600-1800 rmp which was about 40-50 mph (most speed limits) and it was driving me crazy. I decided to do something about it the other day and was looking to install some under the axle pipe and extend it out the back.
I cut off the turndowns and plotted out my idea. I was all set to go to the auto parts store when I started my car to drive down my ramps. It sounded much deeper and interior drone was way way down. I took it for a spin and it sounded great! Almost no drone at all at cruise speeds. Even wot sounded better. I'm still going to extend it out the back but not because of drone, I just like how it looks more with pipes out the back.
Hope this helps someone out.
Hmmmm....duals out the back. What an awesome idea! 
I don't know how you guys deal with turndowns on a daily basis. I have duals out the back with 4 inch round Magnaflows. I still get some drone in the same rpm range as you talk about it but it's not the kind of drone that makes my brain itch. 
I don't know how you guys deal with turndowns on a daily basis. I have duals out the back with 4 inch round Magnaflows. I still get some drone in the same rpm range as you talk about it but it's not the kind of drone that makes my brain itch.
Originally Posted by SOM98TA
so your saying dont point it downwards? just straight out?
I do not think thats the greatest idea.
I do not think thats the greatest idea.
I've got the same problem (dumped b-4 the axle, it's a truck) and have thought about extending it out the back. I know for a fact that the exhaust dumping under the vehicle causes the resonace (sp.) because I have this bridge that I go over that has the metal grate at the top and every time I pass over it my truck sounds like it just cut off, it's that quiet...
Originally Posted by Tim @ EADPerformance
If you want to eliminate drone, point the dumps towards each other instead of to the outside of the car.
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Originally Posted by Tim @ EADPerformance
If you want to eliminate drone, point the dumps towards each other instead of to the outside of the car.
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Originally Posted by Tim @ EADPerformance
If you want to eliminate drone, point the dumps towards each other instead of to the outside of the car.
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Joined: Apr 2003
Posts: 7,133
Likes: 2
From: Miami
Originally Posted by josh99ta
Any particular reason why this works? Just wondering if its just something that works or if there is some science behind it. Getting ready to install TDs myself (Pacesetter LTs, TSP TDs w/ ORX & Moroso Spiral Flows) and wouldn't mind tweaking the TD install a little to get the turndowns pointed toward the side or towards each other if I knew for a fact that it would cut down on interior resonance/drone. Thats the only thing I'm worried about regarding the whole install.
