How can I make my exhaust quieter? - LotusTalk

Patricko · 10-23-2008, 02:15 PM

I don't want to change the exhaust.

Can I bolt something on the tailpipe?

Do these work? How many DBs should it take off? Any downside?

SuperTrapp: Performance Exhaust

I have heard of people putting rubber hoses on the tailpipe and pointing them at the ground. Does that work?

I might like to run Laguna Seca but I am way too loud now.

Tracktimeplz · 10-23-2008, 02:20 PM

Quote:

Originally Posted by Patricko

I don't want to change the exhaust.

Can I bolt something on the tailpipe?

Do these work? How many DBs should it take off? Any downside?

SuperTrapp: Performance Exhaust

I have heard of people putting rubber hoses on the tailpipe and pointing them at the ground. Does that work?

I might like to run Laguna Seca but I am way too loud now.

you cant be louder than the p2 cars there just last night

silly noise rules

LarryB · 10-23-2008, 02:31 PM

Was at Laguana several years ago with Chococar. Think he was ~5dbA over. He came ready with some tip extension to direct the exhaust away from the sound station. That didn't help. He also had a Supertrapp but needed some welding to get them mounted. That didn't happen and he ended up lifting. Not sure if he'd been back since and ran with them.

I'd be a little careful and you may want to do more digging about simply slapping a Supertrapp on. It will also increase back pressure, which a FI car may not be too happy with.

Corvus · 10-23-2008, 02:35 PM

Patrick, you were suppose to call me once you took final ownership of your 211. Call me now and I'll tell you what tricks can be done for Seca to make your pass sound levels.

Patricko · 10-23-2008, 02:50 PM

Quote:

Originally Posted by Corvus

Patrick, you were suppose to call me once you took final ownership of your 211. Call me now and I'll tell you what tricks can be done for Seca to make your pass sound levels.

Ring Ring...

DPM · 10-23-2008, 03:05 PM

Quote:

Originally Posted by Patricko

I don't want to change the exhaust.

Can I bolt something on the tailpipe?

Do these work? How many DBs should it take off? Any downside?

SuperTrapp: Performance Exhaust

I have heard of people putting rubber hoses on the tailpipe and pointing them at the ground. Does that work?

I might like to run Laguna Seca but I am way too loud now.

It will definitely be LOUD with a Supertrapp. We are pushing at least 105 DB with the Diasio. Sounds really good though! Just have to wear a good set of earplugs.

R'elise Me · 10-23-2008, 11:40 PM

Patrick,

Try the Larini 8". Very quiet, nice on the brain. I'm fairly certain it will pass LS standards. I have one if you want to borrow it for the event.

Glen

FLuXeXigeS · 10-24-2008, 12:02 AM

add an inline resonator

as you know they come in different sizes and shapes, heres an example

zuoom · 10-24-2008, 01:04 AM

get a control valve. (basically a butterfly valve added inline)

it will quiet down the xos alot. but do remember not to go high revs when the valve is on the semi closed position.

Lancia · 10-24-2008, 02:03 AM

I've heard of good results with an inverted cone, usually after the muffler.
They can be mounted so they can be removed.
It's not supposed to affect back pressure.

I'm not familiar with the exhaust you have.
Have you thought about the multi-tube Borla?
I have seen them in carbon fibre, though probably experimental only.

I use a turndown and that is supposed to make a difference, though I've never tested it.

Often reducing harshness is more important to the perception of noise than the db level.

Chococar · 10-24-2008, 03:36 AM

Quote:

Originally Posted by LarryB

Was at Laguana several years ago with Chococar. Think he was ~5dbA over. He came ready with some tip extension to direct the exhaust away from the sound station. That didn't help. He also had a Supertrapp but needed some welding to get them mounted. That didn't happen and he ended up lifting. Not sure if he'd been back since and ran with them.

I haven't been back yet, but I will have the Supertrap on the diverter when I do. I think I got a few dB reduction from the diverter by pointing the exhaust away from the meter, but it wasn't enough to be helpful. Short-shifting or lifting both worked, but I would up short-shifting because it was more predictable. I was right at the edge all day.

I love Laguna Seca -- I can't believe I haven't driven there recently

Good luck!

--Joe

carl · 10-24-2008, 06:50 AM

Quote:

Originally Posted by Patricko

I don't want to change the exhaust.

Can I bolt something on the tailpipe?

Do these work? How many DBs should it take off? Any downside?

SuperTrapp: Performance Exhaust

I have heard of people putting rubber hoses on the tailpipe and pointing them at the ground. Does that work?

I might like to run Laguna Seca but I am way too loud now.

Patrick, get a stock S muffler and cut the exit pipe where it comes out of the muffler that's what the factory did on Jacks car. Good seeing last weekend. carl

SweetDaddyD · 10-24-2008, 08:18 AM

at one race I saw a lot of Porsche guys with the rubber elbow clamped to their pipe. I assume it works.

Patricko · 10-24-2008, 08:22 AM

Quote:

Originally Posted by carl

Patrick, get a stock S muffler and cut the exit pipe where it comes out of the muffler that's what the factory did on Jacks car. Good seeing last weekend. carl

That comes out of the bottom, I need the side for the 2-Eleven.

25psi_Elise_Killer · 10-24-2008, 08:29 AM

electronic exhaust control valve:
A'PEXi U.S.A. - Products: Exhaust

Mimzy · 10-24-2008, 05:39 PM

I have a Super Trapp muffler on my Mazda Rx-7(first gen, headers to straight through exhaust). It is plenty loud but this nice thing about this setup is that it is easy to make it quieter. They usually come with twelve discs and the more that you install the louder it gets. Someone spoke of creating to much back pressure with these but, you can actually create negative back pressure with enough discs. Also you are able to tune the engine somewhat by adding and removing discs. More discs are supposed to make it run leaner and fewer make it run rich. For a good street sound that is not too obnoxious 6-8 discs are pretty good. I run twelve and it annoys people.

10-23-2008, 02:15 PM	#1 (permalink)
Patricko Elise Royalty Join Date: Dec 2003 Location: Huntington Beach, CA Posts: 6,058	How can I make my exhaust quieter? I don't want to change the exhaust. Can I bolt something on the tailpipe? Do these work? How many DBs should it take off? Any downside? SuperTrapp: Performance Exhaust I have heard of people putting rubber hoses on the tailpipe and pointing them at the ground. Does that work? I might like to run Laguna Seca but I am way too loud now. __________________ Providing an opportunity for others to live vicariously through me since 2004 ®

10-23-2008, 11:40 PM	#7 (permalink)
R'elise Me My other car's a mtn bike Join Date: Aug 2006 Location: Venice CA Posts: 1,356	Patrick, Try the Larini 8". Very quiet, nice on the brain. I'm fairly certain it will pass LS standards. I have one if you want to borrow it for the event. Glen __________________ Sometimes you have to go in circles to move forward. 05 Elise NA 1750 lbs w/ full cage, fuel cell, aero, 173 whp - Colin would be proud. 2008 LR3 HSE 2005 Mini S Convertible If I'd thought that one day ALL my cars would be British, I'd have laughed at myself!

10-24-2008, 12:02 AM	#8 (permalink)
FLuXeXigeS without a Lotus Join Date: Jul 2007 Location: SoCal/AZ/NV Posts: 4,708	add an inline resonator as you know they come in different sizes and shapes, heres an example __________________ -Coi- currently having Lotus withdrawals Facebook \| Twitter \| Pics \| Vids eBay Store

10-24-2008, 01:04 AM	#9 (permalink)
zuoom Registered User Join Date: Sep 2006 Posts: 45	get a control valve. (basically a butterfly valve added inline) it will quiet down the xos alot. but do remember not to go high revs when the valve is on the semi closed position. __________________ \| CelicaSG.org - CSG \|

10-24-2008, 08:29 AM	#15 (permalink)
25psi_Elise_Killer Drunk on alcohol Join Date: Feb 2007 Location: Los Angeles, CA Posts: 3,130	electronic exhaust control valve: A'PEXi U.S.A. - Products: Exhaust __________________ '06 Evo IX Stage 1E Tuned by Road Race Engineering(Stock:turbo,intake,internals,ECU) Walbro 255lph fuel pump,RC Engineering1000cc Injectors, AVO exhaust,RRE dyno tune flash, Dejon Tool boost controller (325whp @ 22PSI Costco 91 octane, 353whp @ 25psi on 100 octane, 383whp @30psi on E85) , Zeitronix wideband,Zeitronix Ethanol Content Analyzer, Defi BF gauges, Stoptech rotors, SS brakelines,Graphic/Interior Design,Brand Identities,Invitations www.nomadic-nomads.com

10-23-2008, 02:31 PM	#3 (permalink)
LarryB Registered User Join Date: Mar 2003 Location: NorCal Posts: 3,099	Was at Laguana several years ago with Chococar. Think he was ~5dbA over. He came ready with some tip extension to direct the exhaust away from the sound station. That didn't help. He also had a Supertrapp but needed some welding to get them mounted. That didn't happen and he ended up lifting. Not sure if he'd been back since and ran with them. I'd be a little careful and you may want to do more digging about simply slapping a Supertrapp on. It will also increase back pressure, which a FI car may not be too happy with.

10-23-2008, 02:35 PM	#4 (permalink)
Corvus Registered User Join Date: Jun 2005 Posts: 180	Patrick, you were suppose to call me once you took final ownership of your 211. Call me now and I'll tell you what tricks can be done for Seca to make your pass sound levels.

10-24-2008, 02:03 AM	#10 (permalink)
Lancia Registered User Join Date: Dec 2006 Posts: 1,543	I've heard of good results with an inverted cone, usually after the muffler. They can be mounted so they can be removed. It's not supposed to affect back pressure. I'm not familiar with the exhaust you have. Have you thought about the multi-tube Borla? I have seen them in carbon fibre, though probably experimental only. I use a turndown and that is supposed to make a difference, though I've never tested it. Often reducing harshness is more important to the perception of noise than the db level.

10-24-2008, 08:18 AM	#13 (permalink)
SweetDaddyD BANNED Join Date: Jan 2005 Location: ATL, GA Posts: 7,644 Images: 2	at one race I saw a lot of Porsche guys with the rubber elbow clamped to their pipe. I assume it works.

10-24-2008, 05:39 PM	#16 (permalink)
Mimzy Registered User Join Date: Nov 2007 Posts: 61	I have a Super Trapp muffler on my Mazda Rx-7(first gen, headers to straight through exhaust). It is plenty loud but this nice thing about this setup is that it is easy to make it quieter. They usually come with twelve discs and the more that you install the louder it gets. Someone spoke of creating to much back pressure with these but, you can actually create negative back pressure with enough discs. Also you are able to tune the engine somewhat by adding and removing discs. More discs are supposed to make it run leaner and fewer make it run rich. For a good street sound that is not too obnoxious 6-8 discs are pretty good. I run twelve and it annoys people.

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