Jump to content
SAU Community

Recommended Posts

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

Link to comment
https://www.sau.com.au/forums/topic/1511-exhuast-noise/#findComment-29647
Share on other sites

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.

Link to comment
https://www.sau.com.au/forums/topic/1511-exhuast-noise/#findComment-29824
Share on other sites

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,

Link to comment
https://www.sau.com.au/forums/topic/1511-exhuast-noise/#findComment-30300
Share on other sites

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:

Link to comment
https://www.sau.com.au/forums/topic/1511-exhuast-noise/#findComment-30422
Share on other sites

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?!)

Link to comment
https://www.sau.com.au/forums/topic/1511-exhuast-noise/#findComment-30680
Share on other sites

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

Link to comment
https://www.sau.com.au/forums/topic/1511-exhuast-noise/#findComment-31030
Share on other sites

Guest Boxhead

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...

Link to comment
https://www.sau.com.au/forums/topic/1511-exhuast-noise/#findComment-31429
Share on other sites

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.

Link to comment
https://www.sau.com.au/forums/topic/1511-exhuast-noise/#findComment-31449
Share on other sites

Guest Boxhead

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...

Link to comment
https://www.sau.com.au/forums/topic/1511-exhuast-noise/#findComment-32771
Share on other sites

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.

Link to comment
https://www.sau.com.au/forums/topic/1511-exhuast-noise/#findComment-32773
Share on other sites

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.

Link to comment
https://www.sau.com.au/forums/topic/1511-exhuast-noise/#findComment-32797
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • To expand on this to help understanding... The bigger/longer the block is, the more it's going to work to sit on your far away high areas, and not touch the low stuff in the middle. When you throw the guide coat, and give it a quick go with a big block, guide coat will disappear in the high spots. If those high spots are in the correct position where the panel should be, stop sanding, and fill the low spots. However, using a small block, you "fall off" one of the high spots, and now your sanding the "side of the hill". Your little block would have been great for the stone chips, where you only use a very small amount of filler, so you're sanding and area let's say the size of a 5/10cent piece, with something that is 75*150. For the big panel, go bigger!   And now I'll go back to my "body work sucks, it takes too much patience, and I don't have it" PS, I thought your picture with coloured circles was an ultra sound... That's after my brain thought you were trying to make a dick and balls drawing...
    • Oh I probably didn't speak enough about the small sanding block for blocking large areas.  In the video about 3 minutes in, he talks about creating valleys in the panel. This is the issue with using a small sanding block for a large area, it's way too easy to create the valleys he is talking about. With a large block its much easier to create a nice flat surface.  Hard to explain but in practice you'll notice the difference straight away using the large block. 
    • Yep I guessed as much. You'll find life much easier with a large block something like this -  https://wholesalepaint.com.au/products/dura-block-long-hook-loop-sanding-block-100-eva-rubber-af4437 This is a good demo video of something like this in use -    You have turned your small rock chip holes into large low spots. You'll need to fill and block these low spots.  It's always a little hard not seeing it in person, but yes I would go ahead and lay filler over the whole area. Have a good look at the video I linked, it's a very good example of all the things you're doing. They went to bare metal, they are using guide coat, they are doing a skim coat with the filler and blocking it back. If what you're doing doesn't look like what they are doing, that's a big hint for you  
    • The odometer does go up when driving.  Does this tell it is an issue with the speedometer itself?    Where can I look for replacement cluster? Or speedo? I can likely do the repair.. Will ER34 cluster work on HR34? Or do I need a HR34 20GT S2 specifically lol   
    • Mine's a bit bigger at 70x150mm roughly. The spots are flat, just can feel the edges if I dig my nail into it. I did fix some other other ones by both using my finger to sand that small spot (I'm a bit wary of doing this and creating hot spots and a bigger mess) and I also did sand over it flat and others, but this also worried me a bit because if I create an overall low spot on the panel on paint that is good.  Correct me if I'm wrong but as long as it's flat even if I can feel the edges, I can put filler because it will all be level once I sand it? I can see myself going in a circle after sanding guidecoat with 320 grit if for example the panel is flat with my hand but because I sanded the guidecoat I could have created a low spot again somewhere. Unless where I'm going wrong is what I mentioned previously where I didn't go low enough on the grits. It's 1 step forward and 2 step backwards here haha. I'll probably need to experiment with it more. Last time I go back to bare metal lol.
  • Create New...