Resonance problems
Le Mans Master
Joined: Aug 2000
Posts: 5,294
Likes: 2
From: Suffolk, Long Island NY
Re: Resonance problems (Cary)
Hey Face, what rear gears do you have? A4 (2.73 or 3.15 or 3.42) or M6 (3.42 or taller)
A4 with 3.73's and a SY3500 converter. On the parkway I'm fine since I usually travel at 60-70, but in slower traffic and main roads the drone can be very annoying.
:eek: A4 w/3.73 Wow, no wonder you have a drone. Please don't get me wrong, I know your C5 is badass on the 1/4 track. If I'm at 2200rpms at 70 mph in my A4 w/3.42 rear I wonder what your tach reads at 70 mph w/3.73?
I suppose the SY3500 has nothing to do with your drone? Maybe mine will have a less drone since my gears are not as tall as yours? I hope :confused: Or, do I have it backwards. Its the slower speed that feels the drone :mad :confused: really confused now.
[Modified by Cary, 9:57 PM 6/23/2003]
A4 with 3.73's and a SY3500 converter. On the parkway I'm fine since I usually travel at 60-70, but in slower traffic and main roads the drone can be very annoying.
:eek: A4 w/3.73 Wow, no wonder you have a drone. Please don't get me wrong, I know your C5 is badass on the 1/4 track. If I'm at 2200rpms at 70 mph in my A4 w/3.42 rear I wonder what your tach reads at 70 mph w/3.73?
I suppose the SY3500 has nothing to do with your drone? Maybe mine will have a less drone since my gears are not as tall as yours? I hope :confused: Or, do I have it backwards. Its the slower speed that feels the drone :mad :confused: really confused now.
[Modified by Cary, 9:57 PM 6/23/2003]
Safety Car
Joined: Sep 2001
Posts: 4,411
Likes: 1
From: Wilmington NC
Re: Resonance problems (Face)
Hey Face, what rear gears do you have? A4 (2.73 or 3.15 or 3.42) or M6 (3.42 or taller)
A4 with 3.73's and a SY3500 converter. On the parkway I'm fine since I usually travel at 60-70, but in slower traffic and main roads the drone can be very annoying.
:eek: A4 w/3.73 Wow, no wonder you have a drone. Please don't get me wrong, I know your C5 is badass on the 1/4 track. If I'm at 2200rpms at 70 mph in my A4 w/3.42 rear I wonder what your tach reads at 70 mph w/3.73?
I suppose the SY3500 has nothing to do with your drone? Maybe mine will have a less drone since my gears are not as tall as yours? I hope :confused: Or, do I have it backwards. Its the slower speed that feels the drone :mad :confused: really confused now.
[Modified by Cary, 9:57 PM 6/23/2003]It's backwards. When I had 3.15's, the drone was worse, and I had to apply more pedal to get out of it. With the 3.73's it feels as the range of rpms the drone occurs and the amount of pedal I need to apply to get out of the drone both decreased. If I were to do it over again I would have gone with 3.90's. :D
A4 with 3.73's and a SY3500 converter. On the parkway I'm fine since I usually travel at 60-70, but in slower traffic and main roads the drone can be very annoying.
:eek: A4 w/3.73 Wow, no wonder you have a drone. Please don't get me wrong, I know your C5 is badass on the 1/4 track. If I'm at 2200rpms at 70 mph in my A4 w/3.42 rear I wonder what your tach reads at 70 mph w/3.73?
I suppose the SY3500 has nothing to do with your drone? Maybe mine will have a less drone since my gears are not as tall as yours? I hope :confused: Or, do I have it backwards. Its the slower speed that feels the drone :mad :confused: really confused now.
[Modified by Cary, 9:57 PM 6/23/2003]It's backwards. When I had 3.15's, the drone was worse, and I had to apply more pedal to get out of it. With the 3.73's it feels as the range of rpms the drone occurs and the amount of pedal I need to apply to get out of the drone both decreased. If I were to do it over again I would have gone with 3.90's. :D
Melting Slicks
Joined: Feb 2003
Posts: 2,814
Likes: 1
From: FT Lewis WA
Re: Resonance problems (Fast one)
I bought two Car Chemistry header inserts for the exhaust pipes that are supposed to reduce resonance; these could be the cure for the stinger drone. If they work I'll let you know.
Le Mans Master
Joined: Jan 2001
Posts: 5,015
Likes: 508
From: Hilton NY
Re: Resonance problems (Cary)
Installed them last night and removed the inserts borla sent me last year; it took four hours since the whole system had to be dropped. The new inserts cut the resonance down a lot but not entirely, about 60-70%. I didn't have an industrial laser handy to put holes in the stock pipes for stainless steel pop rivets so they were tapped in right at the joint to the x-pipe. The two trailing rings of the inserts that fit into the x-pipe were ground slighty for an easy fit. For systems with no x-pipe the inserts should fit into the exit of the h-pipe, a lot less work. The Jegs part # is 176-3D135L which is a 3 disk 2 1/2" insert, two are needed.
Burning Brakes
Joined: Jun 2002
Posts: 1,202
Likes: 0
From: Clarksburg MD
Re: Resonance problems (Fast one)
One thing to consider, dunno. SLP sells an XPIPE with built-in resonator. I added this to my SLP Loud mouth and WOW what a difference. My resonance is in the 2200-2500 RPM range on my A4 and this occurs only under very light acceleration/gas (like when going up a hill with cruise control at 75mph).
I have 3.15's so my cruising RPM's are 1800-2400.
It still has a mild resonance, but if I can stop the SLP resonance, the stingers
should be a piece of cake with the SLP xpipe w/ resontaor.
Another thing I notice that helps, for you coupe guys - don't use your glass top. The painted top seems to absorb some of the resonance bouncing around in the car.
I really have 0 resonance with windows down and/or top off on my coupe. I don't know many loudmouth people who can say that with no xpipe w/ resonator. I highly recommend it.
Just my $0.02!
[Modified by gmf, 1:27 PM 6/25/2003]
I have 3.15's so my cruising RPM's are 1800-2400.
It still has a mild resonance, but if I can stop the SLP resonance, the stingers
should be a piece of cake with the SLP xpipe w/ resontaor.
Another thing I notice that helps, for you coupe guys - don't use your glass top. The painted top seems to absorb some of the resonance bouncing around in the car.
I really have 0 resonance with windows down and/or top off on my coupe. I don't know many loudmouth people who can say that with no xpipe w/ resonator. I highly recommend it.
Just my $0.02!
[Modified by gmf, 1:27 PM 6/25/2003]
Burning Brakes
Joined: Jun 2002
Posts: 1,202
Likes: 0
From: Clarksburg MD
Re: Resonance problems (gmf)
another source of help for you resonance and interior noise level is:
http://www.b-quiet.com/
I have thought of using them, but have not, yet...
:cheers: :seeya
http://www.b-quiet.com/
I have thought of using them, but have not, yet...
:cheers: :seeya
Le Mans Master
Joined: Nov 1999
Posts: 7,695
Likes: 51
From: Imperial Beach CA
Re: Resonance problems (gmf)
If the resonant sound was high frequency it would be easy. The low frequency stuff we have here is a problem. Unfortunately Lead is the most effective do to it's density but weight will kill you. I had a jet boat with a 455 Olds engine and lead was all that would work.
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