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exhuast noise?

Guest Boxhead

By Guest Boxhead,
in Engines & Forced Induction

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Guest Boxhead

Guest Boxhead

Posted
Posted

its performance, coz i would like to let you all know that i set of my first car alarm with my exhuast, i was only doing lik 3000rpm too

basically my question is.. how can you know if yoru exchuast is over the legal limt, without actually testing it???

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doxximus Grand Master

doxximus

Posted
Posted

ok i got a 2 1/2" zorst from engine

had an epa test yesterday and with standared muffler i got 88db out of the leagal 90db

now with the big bore attached (without resinator which is gonna be added tomorrow) i dunno what it would be, but try setting off 12 car alarms just by driving past at 20km/h or less, its one loud mf!

basically if u have a standared muffler but a big ass pipe like 2 1/2" it will be almost illegal, dunno how it would be for a 3" but im guessing it would go over

chuck a big bore and see what happens hahaha, sounds mad in the cabbin to, shakes everything

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PranK Grand Master

PranK

Posted
Posted

I have a big ass 'zorst - 3 1/4 off the tubo, 4" high flow cat and 3 1/2 cat back... its stinkin' loud, over the limit for sure and sets off alarms all the time at any rev range..

if i get busted by the epa, i'll take it off - maybe even consider selling the car, its too difficult to own a nice modded car these days.

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two40 Grand Master

two40

Posted
Posted
Originally posted by PranK

if i get busted by the epa, i'll take it off - maybe even consider selling the car, its too difficult to own a nice modded car these days.

LOL

as if you would. you'd turn gay before you sell it and don't tell me otherwise cause i aint listening:talk2hand

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doxximus Grand Master

doxximus

Posted
Posted

i just got my big bore refitted with a hotdog resinator

but it didnt make all that much difference, it idles the same, its slightly a bit lower but nothing u can tell

the dude gave it to me for free coz it didnt work hahaha he is cool,

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PranK Grand Master

PranK

Posted
Posted
Originally posted by ONARUN

LOL

as if you would. you'd turn gay before you sell it and don't tell me otherwise cause i aint listening:talk2hand

shut up - i was just expressing my anger towards the way that the rta and the police treat us...

:talk2hand:

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d0p3y Grand Master

d0p3y

Posted
Posted

Hmm, that's one thing im worried about when i get my car. Noise defects = 2 point penalty

P platers only get 6 points.. i don't want to lose my liscense from defects!

I'm going with 3" right through, and an apexi N1 muffler (or look-a-like) what's the go with those silencer things? i hear they are bad for your car, and i read somewhere they cause pinging (wtf?? is that possible?!)

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Chris32 Veteran

Chris32

Posted
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I was thinking of making up a flap that sits inside the cat (the cat convetor minus its innards) which could be cable operated. If you need you car to be quiter, pull the cable, which will pull the flap down in the cat ,effectivly bouncing the sound waves back to the engine. haven't made one yet, but have seen one on a GTR with a full3.5 inch exhaust with no resonators and a straight through muffler and it made it REALLY quiet. Keep everyone posted

Chris

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Guest Boxhead

Guest Boxhead

Posted
Posted

firstly, we all know that n/a are louder then turbo powered....

im n/a...

secondly, im in sydney atm.. and well we went through burwood westfeild car park, and set off about 8 alarms in the space of about 5minutes.. most of that time was finding cars worth putting alarms on...

over 2 days my car has set off 16 alarms, half in westfeild, the others along the streets of sydney..

my back muffler is actually a twin hot dog style.. and its loud.. i hope i dont get done..the guys at the exhuast joint said it should quiten down a bit after its been used a little tho.. coz they put on a 2 1/2 cat back...

i was also told by a guy who knows cars.. that if you take out the cat convertor, and put in another muffler, it will sound much bette,r give better performance and also better fuel economy.. looks like i might do that soon.. hahaha and none of you loody tree huggin hippies better try and stop me.

by the way if any of you guys see a gunmetal grey skyline nsw plate xxx-662, thats me.. ill be around summer hill, burwood, etc etc...

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head`turner Rookie

head`turner

Posted
Posted
i was also told by a guy who knows cars.. that if you take out the cat convertor, and put in another muffler, it will sound much bette,r give better performance and also better fuel economy.. looks like i might do that soon..

Not only is it illegal, but you could be up for thousands of dollars in emission fines. Why? something called polution. Polution laws came in the early 80's, and all cars after a certain date required a cataylic converter by law. If you want better performance, get a turbo.

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Guest Boxhead

Guest Boxhead

Posted
Posted

its because of tree huggin hippes we need to have them, pffft i wont live long enough to see the difference, therefor its not my problem, and anyway by the time it makes a differece, they will have things to fix the problem without a cat convertor... ohwell.. we will see what happens, by the way, the alarm count so far is up to 31...

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PranK Grand Master

PranK

Posted
Posted

yo.

I wasn;t running a cat for a while... i have a big ass exhaust.

I got a 4" high flow put in and it has just quietened it - no performance loss at all. its not worth it for the risc of a hefty fine and destroying the environment.

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Duncan Grand Master

Duncan

Posted
Posted
Originally posted by Chris32

I was thinking of making up a flap that sits inside the cat (the cat convetor minus its innards) which could be cable operated. If you need you car to be quiter, pull the cable, which will pull the flap down in the cat ,effectivly bouncing the sound waves back to the engine. haven't made one yet, but have seen one on a GTR with a full3.5 inch exhaust with no resonators and a straight through muffler and it made it REALLY quiet. Keep everyone posted

Chris

http://www.autospeed.com/A_0883/page1.html

has an article on an exhaust noise control system.

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