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Exhaust tip to be sillent - please help

 
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Old 12-15-2014, 09:59 AM
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Exhaust tip to be sillent - please help



Ok, I drive Prelude BB9 (2.0, European market, F20A4)

In this picture you can see my exhaust setup, without CAT (removed).

1) 4-1 manifold
2) first silencer, brand new, fi 60 inside diemeter, full flow
3) second silencer, old, fi 70 inside diemeter, full flow
4) third (rear) silencer, brand new, fi 60 inside diemeter, half flow (3 chamber like in picutre).

p.s. - yellow is wool inside silencer.

My last setup was like this, but with only second fi 70 silencer and rear full flow jap style fi 60 silencer. Without first silencer.

Inside cabine in 3000 rpm was about 125 db loud . Very loud.

And now I buy this new rear half flow silencer, and put new first silncer (like in picture), a now I have in 3000 rpm 100 db. Still loud.

I must replace and second fi 70 silencer because is old and damaged (road and low car ).

Can you sugest me what to buy? If I buy new fi60 silencer and put instead second fi 70 - I think that it wil be still preaty loud.

Ok - If I buy twinn loop rear silencer - this will be good opinion, but to expansive to me. And I don't want because I have new rear silencer.

What to put in second silencer? Maybe another half flow fi 60?

Oh I forgett - in 2 week I will remove 4-1 manifold and put 4-2-1 manifold.

Tnx!
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Old 12-16-2014, 09:18 AM
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Re: Exhaust tip to be sillent - please help

Vibrant makes some fairly quiet mufflers.

They are not 60db at 3000 rpm, but not 125 either.

But check out their set up. Say an 18" (1650 mm) vibrant resonator (which I guess you call silencer) up front. It is made very durable on the inside. And their mufflers are fairly quiet...and you can get them in dual tip if you like the stealthy factory look. Or you can get their ultra quiet muffler. There are other brands. But a couple of folks I know who don't care about the cost go with vibrant, even though they are not that expensive.
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I remember my first thread, asking what a noise was when I got going 110mph.
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Old 12-17-2014, 07:10 AM
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Re: Exhaust tip to be sillent - please help

Tnx, in case I want a still good flow but not loud sound.

Now I have only loud sound in about 2700-3500 rpm, in range where engine starts to move. In cabine is cca 100-105 db. After 3500 rpm sound starts to falling and after 4500 rpm is about 70 db :D
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Old 12-17-2014, 07:19 AM
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Re: Exhaust tip to be sillent - please help

Vibrant Performance 1790 Bottle Style Resonator | eBay

But if I buy something like this and put that beside of my second resonator (silencer by me :D ) - I'm not sure if this will quiet my exhaust.

Maybe if I put new resonator like my third - a half flow resonator but smaller dimensions.
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Old 12-17-2014, 10:19 AM
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Re: Exhaust tip to be sillent - please help

Can't really comment on the number of silencers.
But I think that link you provided is the one I'm ttalking about. I'll take a photo of the one I have awaiting install on my car along with an older model 57mm thermal research system.

Just know a guy with an apexi pipe that has the 18" 450mm vibrant resonator who drives long distances on a regular basis. He has no complaints and doesn't say "what did you say?"a lot so I'm guessing he has no hearing loss.
He has a free flow exhaust system too. I'll ask him which muffler he has later today.

Oh, my previous post said '1600mm. That was incorrect. 25.4mm x 18" = 457, not 1600. Hope I didn't mislead you.
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welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
Quote:
Originally Posted by elspectro29 View Post
Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
Quote:
Originally Posted by Lindso View Post
I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

God's Not Dead

Last edited by bykfixer; 12-17-2014 at 10:24 AM.
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Old 12-17-2014, 01:18 PM
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Re: Exhaust tip to be sillent - please help

you can buy the obx twin loop on ebay for under $100
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Old 12-17-2014, 09:09 PM
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Re: Exhaust tip to be sillent - please help


^^ the vibrant resonator (silencer)
Looks like the same one you posted Tomina. Maybe the inside diameter differs between this and the 57mm (2-.25") one in the link you posted.


^^ it's a free flowing unit.

I have stock, so I'm just passing on what people who know their stuff tell me. And they say this silencer will hold up well, and not disintigrate over time like many other brands. Not trying to dis the obx one 95. I can only say the Vibrant gets the thumbs up from DEPOG.

So whenever I get to the point in my project to upgrade the exhaust, this Vibrant unit will be part of it.
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Quote:
Originally Posted by ogsmakdade View Post
welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
Quote:
Originally Posted by elspectro29 View Post
Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
Quote:
Originally Posted by Lindso View Post
I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

God's Not Dead

Last edited by bykfixer; 12-17-2014 at 09:14 PM.
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Old 12-18-2014, 08:36 AM
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Re: Exhaust tip to be sillent - please help

I will see...

For now the stupid problem is because I have only loud sound from cca 2500 to 3500 rpm.
And that is problem because 90% of drive is in this range :D

When engine revs above 3500 rpm - it is not loud.

I will see how much I have space in that second resonator in my picture, and maybe my exhaust mehanic can do a smaller twinn loop and put in instead of second muffler.

Or if not - i will buy that twin loop and repleace rear third resonator, ahhhh.

I will record sound and you will hear.
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Old 12-22-2014, 12:47 PM
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Re: Exhaust tip to be sillent - please help

I have never purchased a OBX Twin muffler, but I'm sure the quality is okay. I have had OBX headers back in 2001 / 2002 and they fell apart. (welds cracked, brackets broke off)


A OBX muffler should be okay though, a lot of good mufflers will flow freely and have a resonated chamber that will bring down sound, mufflers such as the Apexi WS2. I would assume over time the OBX muffler packing will degrade and sound will slowly get louder and louder over time.

Vibrant mufflers make good quality mufflers and resonators, highly recommended.

Resonator placement is key to tuning sound in the cabin.

If you are still running a catalytic converter, I would first put a 12 inch resonator about 3 inches after the Cat and another 18 inch resonator right before the first 90* bend. (So basically your mid section pipe will consist of 2 resonators and about 5 inches of piping)

That should help the drone at cruising speeds.
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Old 12-24-2014, 04:09 PM
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Re: Exhaust tip to be sillent - please help

Anyone tried a flowmaster or magnaflow muffler on 2.5" piping?
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Old 12-25-2014, 02:54 PM
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Re: Exhaust tip to be sillent - please help

I have a 40 series flowmaster on a mandrel bent aluminized stainless 3" summit 16 gauge piping system hooked to OEM cat and neuspeed 4-1 header without a resonator. I use double seals at bolt-joints and good mig welds so no leaks. It's pretty loud. I'm just going to get a parts house 16" resonator and mig weld it in before the bend.

Supposedly the 50 and 60 series are more quiet. None of them have fiberglass, they are all chemically treated steel chevron shaped fins inside. I've never had one rust I guess they have thermal powder coating..


SIDE NOTE: Resonated tips have NO result, I've tried multiple styles and brands..

Last edited by c340nj8; 12-25-2014 at 04:25 PM.
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