What part to replace to get rid of drone?
#16
Lexus Test Driver
iTrader: (2)
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Originally posted by macah:
"IMO the drone is minimal. It's bearable. ..."
I convinced myself of this as well. I definitely didn't spend 4k upgrading from standard to long tube unequal length headers just to get the car to sound better. It was an 11 sec. et I was after. The melodious sound a pleasant side effect.
And the Bazooka pipes will not reduce drone.
"IMO the drone is minimal. It's bearable. ..."
I convinced myself of this as well. I definitely didn't spend 4k upgrading from standard to long tube unequal length headers just to get the car to sound better. It was an 11 sec. et I was after. The melodious sound a pleasant side effect.
And the Bazooka pipes will not reduce drone.
#17
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Drone is caused by vibration. You either need to dampen the piping or you need to remove the frequency causing said vibration. Helmholtz chambers is what is generally used to remove this. I would imagine a strong majority of these exhausts were developed with the factory headers, thus why they seem to drone once replaced with aftermarket units.
Best best will be to have helmholtz's chambers installed.
Best best will be to have helmholtz's chambers installed.
#18
Pole Position
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Does anyone have a cutaway picture of the Borla mufflers?
I orderd some silencers to fit in two of the four exhaust outlets in the Borla mufflers.. I'm hoping blocking off 2 out of 4 will kill the loud bass tone and drone from this system.
The ISF is my daily driver, and the Borla w/stock manifolds is a little too loud for my neighbours at 5am
I orderd some silencers to fit in two of the four exhaust outlets in the Borla mufflers.. I'm hoping blocking off 2 out of 4 will kill the loud bass tone and drone from this system.
The ISF is my daily driver, and the Borla w/stock manifolds is a little too loud for my neighbours at 5am
#21
Pole Position
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Drone is caused by vibration. You either need to dampen the piping or you need to remove the frequency causing said vibration. Helmholtz chambers is what is generally used to remove this. I would imagine a strong majority of these exhausts were developed with the factory headers, thus why they seem to drone once replaced with aftermarket units.
Best best will be to have helmholtz's chambers installed.
Best best will be to have helmholtz's chambers installed.
![Frown](https://www.clublexus.com/forums/images/smilies/frown.gif)
I would love to see some Helmholtz chambers welded onto the Borla to see where they do it and see clearances?
#23
Pole Position
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Curious, let me know if and when you do this and the results!
#25
Pole Position
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I have my stock exhaust still, so I'm curious what part they're talking about and where they hooked it up?
#28
Racer
iTrader: (3)
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Makes sense. The piping on the driver side is longer so it would have more resonance. Kinda like a ruler when you pull on it at the edge of a desk. The more hanging over the edge, the more resonance and vice versa. I don't think I'm explaining myself clearly but this is something i used to do in grade school lol.
#29
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Well if this works, then talk about a cheap way to fix the drone
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#30
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I would say "drone" is subjective. Everyone is going to have an opinion on what's tolerable. My hks ssm has helmholtz resonators and all I can say is that at 2K rpm, it's quieter than the stock exhaust. 2k seems to be the most pronounced spot for drone with all exhausts with the isf.