reducing drone

Zsteve · 11-27-2009, 05:54 PM

After researching and all, I have found that almost all aftermarket exhausts will have the 2K drone and that is the only time I am getting it, when around 60 mph in "D" mode at around 2k rpms. When with the wife who likes to talk while I drive its noticable but when its just me and Im usually on the gas I get that nice deep growl I like. And when Im driving at that one point it does drone I usually have the stereo up load and dont hear it. Just when the wife is with me that its a little loud. Now I willsay I love the tone of this exhaust better than any other one I heard on here so far and there are gains. Just wondering if I can cut down on the 2K drone some. Also I have the 7AT which might make a diff with the drone. So going to 18s will or wont help with this?

Zsteve · 11-27-2009, 05:58 PM

Quote:

Originally Posted by imag

Look at it this way - you're making those of us who went with Stillen feel better about it

So Stillen doesnt drone any?

m4a1mustang · 11-27-2009, 06:07 PM

Quote:

Originally Posted by imag

Look at it this way - you're making those of us who went with Stillen feel better about it

That's fine. I just make sure to be honest when giving feedback. I love the sound of my FI CBE and don't regret getting it. Yes, there is some drone at 2k but the benefit far outweighs the cost. I have heard the Stillen setup and some others and they all sound raspy to me... the only one with absolutely ZERO rasp is FI... it puts the others to shame, IMO.

If you like it, that's great. That's all that matters.

I can't count how many times I have said how much I like this exhaust, yet people continue to rag on me for talking about drone. It's ridiculous and plain childish!

m4a1mustang · 11-27-2009, 06:10 PM

Quote:

Originally Posted by Zsteve

After researching and all, I have found that almost all aftermarket exhausts will have the 2K drone and that is the only time I am getting it, when around 60 mph in "D" mode at around 2k rpms. When with the wife who likes to talk while I drive its noticable but when its just me and Im usually on the gas I get that nice deep growl I like. And when Im driving at that one point it does drone I usually have the stereo up load and dont hear it. Just when the wife is with me that its a little loud. Now I willsay I love the tone of this exhaust better than any other one I heard on here so far and there are gains. Just wondering if I can cut down on the 2K drone some. Also I have the 7AT which might make a diff with the drone. So going to 18s will or wont help with this?

We'd have to ask Tony about the difference the resonators would make.

I am the same way as you. My girlfriend has sensitive hearing so not just the drone, but the volume alone bothers her on any extended trips.

When I am by myself I am not bothered. It's there, but it's not a real bother. The ECU whine cuts through the drone and pierces my ears anyways. That's the only thing in the car noise-wise that bothers me. Actually it kills me.

imag · 11-27-2009, 06:28 PM

Quote:

Originally Posted by Zsteve

So Stillen doesnt drone any?

Not that I can tell. It sounds better, but noticeably louder, at low RPMs.

Zsteve · 11-27-2009, 07:26 PM

Quote:

Originally Posted by m4a1mustang

We'd have to ask Tony about the difference the resonators would make.

I am the same way as you. My girlfriend has sensitive hearing so not just the drone, but the volume alone bothers her on any extended trips.

When I am by myself I am not bothered. It's there, but it's not a real bother. The ECU whine cuts through the drone and pierces my ears anyways. That's the only thing in the car noise-wise that bothers me. Actually it kills me.

So far no ECU noise for me that I can hear but I have slight hearing loss at the 6K freq anyway.

Modshack · 11-27-2009, 07:27 PM

Quote:

Originally Posted by Zsteve

So Stillen doesnt drone any?

No drone from the Stillen..

Matt · 11-27-2009, 07:30 PM

Quote:

Originally Posted by Matt

My fear with Stillen, and potentially the future Berk CBE, is that it won't be loud enough. If I have to deal with a little drone to get the tone of the FI, so be it.

How aggressive is the stillen? From the look of the muffler design, I wouldn't guess it's too loud at all, just a little throatier than stock.

I'm looking hard at FI and Berk right now.

Zsteve · 11-27-2009, 07:48 PM

Was doing some research and read that side branch resonators seemed to help the drone by getting the freqs 180 degrees out of phase with each other that end up canceling each other. Is that why the Saclam exhaust looks the way it does? I was wondering if adding something like that would help reduce it but keep the same tone.

Still, I love the tone of the exhaust so I guees the wife just cant ride in it as much, cuz when Im alone in it Im hardly ever at the 2K range for my style of driving (FAST).

After reading more into their exhaust it seems that the Saclam has added side pipes to help with drone.

m4a1mustang · 11-27-2009, 07:51 PM

Quote:

Originally Posted by Matt

I think the Stillen CBE alone sounds good, but if you throw HFCs on it really sounds like crap. Some CBEs get very raspy when you add HFCs and the Stillen is one of those.

Zsteve · 11-27-2009, 08:03 PM

So if add a side pipe would reduce drone even 50% what size diameter and length would be required? Looking for all the math/science guys on this one.

m4a1mustang · 11-27-2009, 08:12 PM

I think that would just end up being an epic waste of money. I thought the Saclam exhaust had cutouts to bypass the muffler anyways... i know nothing about side tube resonators... if they exist... and if they even work.

m4a1mustang · 11-27-2009, 08:15 PM

I know the situation you are in, too. A little bit of it is guilt because you don't like that your significant other no longer likes riding in the Z with you because of the exhaust. When she's in the car with you, you feel bad because you know she's bothered.

But when you are alone, you enjoy it.

Instead of wasting money, just let time pass and you will get over it and it will get better. Don't let the guilt get to you.

Yeah, it sucks that my car gives my girlfriend headaches.... but have you heard how f'ing awesome it sounds? Priorities.

Zsteve · 11-27-2009, 08:33 PM

Quote:

Originally Posted by m4a1mustang

I know the situation you are in, too. A little bit of it is guilt because you don't like that your significant other no longer likes riding in the Z with you because of the exhaust. When she's in the car with you, you feel bad because you know she's bothered.

But when you are alone, you enjoy it.

Instead of wasting money, just let time pass and you will get over it and it will get better. Don't let the guilt get to you.

Yeah, it sucks that my car gives my girlfriend headaches.... but have you heard how f'ing awesome it sounds? Priorities.

I agree and the wife isnt in it much but now Im just more curious about all this side branch stuff. Ive been googleing it alot and it seems the side branch pipes are a legit way of getting rid of low freq noise (its used in cars, buildings, plants, etc that have generators). I think the Saclam used what is called a trombone style side branch modified a tad. The thing you have to calculate is what freq is producing the drone and then calculate the right length of the side branch to get it to bounce back 180 degrees out of phase to cancel each other out. Sounds pretty interesting. And it would be easy to tap into existing exhaust if you get the right deminsions.

Curiousity has got my attention.

Matt · 11-27-2009, 08:54 PM

Does the Ark exhaust have the pipes you are talking about?

11-27-2009, 05:54 PM	#16 (permalink)
Zsteve A True Z Fanatic Join Date: Sep 2009 Location: TX Posts: 3,298 Drives: the 2 balled club Rep Power: 22	After researching and all, I have found that almost all aftermarket exhausts will have the 2K drone and that is the only time I am getting it, when around 60 mph in "D" mode at around 2k rpms. When with the wife who likes to talk while I drive its noticable but when its just me and Im usually on the gas I get that nice deep growl I like. And when Im driving at that one point it does drone I usually have the stereo up load and dont hear it. Just when the wife is with me that its a little loud. Now I willsay I love the tone of this exhaust better than any other one I heard on here so far and there are gains. Just wondering if I can cut down on the 2K drone some. Also I have the 7AT which might make a diff with the drone. So going to 18s will or wont help with this? __________________ 2010 LS3 C6 Silver coupe corvette

11-27-2009, 07:48 PM	#24 (permalink)
Zsteve A True Z Fanatic Join Date: Sep 2009 Location: TX Posts: 3,298 Drives: the 2 balled club Rep Power: 22	Was doing some research and read that side branch resonators seemed to help the drone by getting the freqs 180 degrees out of phase with each other that end up canceling each other. Is that why the Saclam exhaust looks the way it does? I was wondering if adding something like that would help reduce it but keep the same tone. Still, I love the tone of the exhaust so I guees the wife just cant ride in it as much, cuz when Im alone in it Im hardly ever at the 2K range for my style of driving (FAST). After reading more into their exhaust it seems that the Saclam has added side pipes to help with drone. __________________ 2010 LS3 C6 Silver coupe corvette Last edited by Zsteve; 11-27-2009 at 07:59 PM. Reason: added the last line

11-27-2009, 08:03 PM	#26 (permalink)
Zsteve A True Z Fanatic Join Date: Sep 2009 Location: TX Posts: 3,298 Drives: the 2 balled club Rep Power: 22	So if add a side pipe would reduce drone even 50% what size diameter and length would be required? Looking for all the math/science guys on this one. __________________ 2010 LS3 C6 Silver coupe corvette

11-27-2009, 08:12 PM	#27 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6962	I think that would just end up being an epic waste of money. I thought the Saclam exhaust had cutouts to bypass the muffler anyways... i know nothing about side tube resonators... if they exist... and if they even work. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

11-27-2009, 08:15 PM	#28 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6962	I know the situation you are in, too. A little bit of it is guilt because you don't like that your significant other no longer likes riding in the Z with you because of the exhaust. When she's in the car with you, you feel bad because you know she's bothered. But when you are alone, you enjoy it. Instead of wasting money, just let time pass and you will get over it and it will get better. Don't let the guilt get to you. Yeah, it sucks that my car gives my girlfriend headaches.... but have you heard how f'ing awesome it sounds? Priorities. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

11-27-2009, 08:54 PM	#30 (permalink)
Matt A True Z Fanatic Join Date: Oct 2009 Location: Augusta, GA Age: 41 Posts: 1,680 Drives: 2010 Avalanche LT Rep Power: 19	Does the Ark exhaust have the pipes you are talking about? __________________ "Any man who can drive a 370z while kissing a pretty girl is simply not giving the Z the attention it deserves." Albert Einstein....modified.