Toyspeed.org.nz Message Board

by **metric** » Thu Apr 03, 2008 9:34 pm

Anyone know where i can get one of them mufflers with the butterfly valve inside it that you can change inside the car ?

have seen a few adverts but cant seem to find any at the moment!!

by **RickGT** » Thu Apr 03, 2008 10:58 pm

iirc any valve in the exhaust system is elligal, im sure i read it at ltnz

by **RickGT** » Thu Apr 03, 2008 11:05 pm

"An exhaust system must not be constructed or
modifi ed in a way that allows a person to interfere
readily with its operation or reduce its eff ectiveness"

by **metric** » Fri Apr 04, 2008 7:52 am

yeah yeah i guessed that one

if i wanted to be told off i would of asked my mother

so does anyone have one or know where to get one?

by **cogent** » Fri Apr 04, 2008 9:25 am

RickGT wrote:"An exhaust system must not be constructed or
modifi ed in a way that allows a person to interfere
readily with its operation or reduce its eff ectiveness"

wonder if that applies to good ol supatrappz

by **slighty_sykotic** » Fri Apr 04, 2008 11:05 am

metric wrote:yeah yeah i guessed that one

if i wanted to be told off i would of asked my mother

so does anyone have one or know where to get one?

How about a muffler shop!!!!!!!!!!! Shock horror!

by **solitaire** » Fri Apr 04, 2008 11:14 am

metric wrote:Anyone know where i can get one of them mufflers with the butterfly valve inside it that you can change inside the car ?

have seen a few adverts but cant seem to find any at the moment!!

Whats the point?

no grip · by **Akane** » Fri Apr 04, 2008 2:45 pm

APEX'i used to do one that's manually operated, and back in the 2003 days there was a group buy on an electronic one made by some American company.

by **TRD_ZERO** » Fri Apr 04, 2008 3:36 pm

I think its called verex muffler or something like that

by **MR2SIK** » Fri Apr 04, 2008 4:34 pm

I was thinking about using one of them recently, and have the valve controlled by a rev switch, kinda like the Jags/Astons/New Falcons use.

Website · by **Bling** » Fri Apr 04, 2008 5:04 pm

solitaire wrote:
metric wrote:Anyone know where i can get one of them mufflers with the butterfly valve inside it that you can change inside the car ?

have seen a few adverts but cant seem to find any at the moment!!
Whats the point?

with a combination of said awesome switching butterfly illegal crap and his $79 trademe fuel chip, hes going to double his power and mileage in one foul swoop :roll:

by **solitaire** » Fri Apr 04, 2008 7:25 pm

BZG|Bling wrote:with a combination of said awesome switching butterfly illegal crap and his $79 trademe fuel chip, hes going to double his power and mileage in one foul swoop

So its just so you can have your exhaust louder than the legal limit? thats it?

by **Guss** » Fri Apr 04, 2008 7:49 pm

you're all so skeptical, maybe he wants to have a normally quiet car 90% of the time and a mildly loud car the other 10% (which are hopefully during daylight hours ).
I think it is legal and can be certified provided it does not exceed 95db in any setting.

by **metric** » Fri Apr 04, 2008 8:08 pm

definably a day car only has only been out at night for some ball drop offs, but at the moment it has a flange just before the muffler that i swap before going racing as such.

the normal muffler is reasonably quiet but really cuts power in the 5000+ region would be nice to be able to get round this

was really lookin for the different companies/names, and anyone that has experienced what they are like

Website · by **Bling** » Fri Apr 04, 2008 9:23 pm

Guss wrote:you're all so skeptical, maybe he wants to have a normally quiet car 90% of the time and a mildly loud car the other 10% (which are hopefully during daylight hours ).

i'm not sure if its skepticism or being realistic as to his requirements and whats actually legal to do

Could be an option to get a better muffler then? loud doesn't equal power. A fast car can easily be quiet, so maybe look at a redesign of your current system. what size piping?

what car is it?

OMG so shiny! · by **Dell'Orto** » Fri Apr 04, 2008 10:05 pm

BZG|Bling wrote: loud doesn't equal power.

Unless its an NA rotary, quiet exhausts choke the bejesus out of them.

PICS UPDATED DAILY · by **method** » Fri Apr 04, 2008 10:47 pm

BZG|Bling wrote:loud doesn't equal power

What!?
Every one knows the louder it is the faster your car goes!

Find me a quiet car, you keep it quiet and make power, ill make it loud and have more power. :lol:

Website · by **Bling** » Fri Apr 04, 2008 11:11 pm

the more guages you have the faster you go too.... *leaves thread*

by **darkwolf** » Sat Apr 05, 2008 9:17 am

BZG|Bling wrote:the more guages you have the faster you go too.... *leaves thread*

The correct term is clocks

by **barryogen** » Sat Apr 05, 2008 1:27 pm

The altezza's have one in their factory muffler, it is spring controlled, not sure if it is on both models or not.

Can't be bothered finding, it, but when I was reading about it I followed a link from here.
http://homepages.paradise.net.nz/jswright/altezza.html

Apparently the spring breaks after a while and rattles in the exhaust, and no way to open it up without royally $&#$% it.

There is an Aussie company that makes them too, can't think of their name off the top of my head.

You could always have a go at making one yourself... would probably need some help from a physicist/spring person and a flow person to sort out the pressures you'll be dealing with.

http://autospeed.com/cms/A_1744/article.html?popularArticle

I think it's a cool idea, personally I have been wondering about fitting a wastegate type of thing to my exhaust to keep a constant amount of back pressure to keep noise to a minimum... yeah it'll use a bit more gas having to force the exhaust out, but I'm more concerned about noise than fuel consumption... at least at the moment.

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