Drop DB of Exhaust

[Guest INASNT]

Whats the easiest way to drop the db of an exhaust a few db, to under 90db coz i gotta go to bloody epa for a db and pollution control test next week?

I got a full 3inch system at the moment, with high flow cat and resonator. With a db tester from work its around 88db on idle when warm.I know they rev it to about 3000rpm for the test and i am sure it will be around 95 db at 3000rpm.

Whats the best way to quieten it down, and then ofcourse put it back to normal after the test?

[ed]

will the EPA accept cars with silencers for the test?

If you want something reversable perhaps see if you can borrow a smaller diameter muffler?

[Guest INASNT]

u have to have the silencer fully welded on, not just tach welded on for the test

[Leewah]

The test is done by an independant EPA chosen representitive. I believe that there is a listing on your piece of paper which lists who can do the test.

A silencer will only be accepted if the silencer is welded in place. A screw in silencer is not acceptable.

They reved my car to 5k and you must come in under 90db. I got 89db with a stock GTR exhuast on a totally stock R33 GTR.

[ed]

5,000? are you sure?

I thought it was half the rev limiter?

[Guest INASNT]

dave

i gotta take my car to the epa place in mcloud coz the asshole cop tha canaried me reported to the epa i had my pollution control epuipement tampered with!! pfftt, so they do a db test, pollution control test and some other crap 2!

they shouldnt rev it to 5000rpm that bullshit.

[Leewah]

I'm sure they tested my car at 5k. Maybe coz it's a 2.6 but I'm pretty sure they check it by number of cylinders in the car.

I could be wrong though....

[Guest INASNT]

u reco if i got a fake rego sticker made up with my number plates but for a stock white r33 they would even realise?? coz all they have is my number plate and thats its a skyline.

[poyz]

They test it at 2/3rds (can't remember exact figure) of the of the (stock) engine's maximum power output rpm.

[Guest INASNT]

looks like i got get a farkin another muffler in for the time being then piss it off later.

farkkkkkk

[MrR33]

if it was me, id just see if u can borrow someones stock 33 zorst 4 the test-a swap only takes half an hour max, and that way i think ud b sweet

[MotoX]

"The A'PEXi ECV (Exhaust Control Valve) allows you to control the loudness of your exhaust sound. The ECV is installed right after the catalytic converter, and adjustment of the valve is done through a cable run from the ****pit to the valve body. All you have to do is slide the lever installed in the car to get the appropriate sound. With the A'PEXi ECV you'll no longer need to get out of the car to fit a detachable silencer into the tail pipe."

get one of them, i wanted one on my old vl being a 308, i thought yeah dump pipes. but then i thought nar its jsut a shitty vl.

[ed]

Originally posted by INASNT

u reco if i got a fake rego sticker made up with my number plates but for a stock white r33 they would even realise?? coz all they have is my number plate and thats its a skyline.

not worth the risk...

maybe buy stock muffler and get muffler place like midas to put it on

[ice180]

leewah your car didn't pass the test

a swapsie was done with another stock gtr same colour - plates and rego label swapped and bob was your uncle....

[ed]

Originally posted by MotoX

"The A'PEXi ECV (Exhaust Control Valve) allows you to control the loudness of your exhaust sound. The ECV is installed right after the catalytic converter, and adjustment of the valve is done through a cable run from the ****pit to the valve body. All you have to do is slide the lever installed in the car to get the appropriate sound. With the A'PEXi ECV you'll no longer need to get out of the car to fit a detachable silencer into the tail pipe."

get one of them, i wanted one on my old vl being a 308, i thought yeah dump pipes. but then i thought nar its jsut a shitty vl.

that's a factory option on the 34's

sidewaysmambo is testing an aftermarket one out...

[Guest INASNT]

richie

my gfriends aunt works at vicroads so i can get her to make me a bodgy 1, my i might get her in trouble as well!

MotoX

where and how much would i of em be?

[MotoX]

jsut to let u guys know, from experience.

RWC places take pictures of your cars if they have suspision that u will put your goodies back or/ removal of things.

then when u get tried for defects and u think o yeah im cool its all going to be sweet ill jsut show em my new rwc cert (QLD)

they will go and ring the rwc company up, the rwc company will most probably have pictures and u will be caught.

and they do ring and follow up trust me.

and be nice to cops too. their only doing their job. but some are assholes.

[Lozza150]

http://home.vicnet.net.au/~ozhog/Technical.../ozhogtech1.pdf

this link might help to show how the test is to be done properly.....

Breakdown....

Test to be done in open area.....

Mic's to be placed on a 45 degree angle facing the exhaust....

RPM:

1-5 cyl 4,000

6 cyl 3,200

8 cyl 3,300

Rotary, 4,500

It should equate to approx 100-110 KPH (maximum speed of vehicle by LAW)

(on road of course... )

No one else to be in the location during the test.....

But have a read through it's very interesting....

oh and INASNT what sort of exhaust do you have....

Loz

:burnout:

[predator]

MotoX: its not as bad as QLD yet here in VIC, but it will soon get that way I guess. I haven't heard of anything like that happening. I think they _do_ however have a register here so if you keep getting busted you're in trouble.

Inasnt: I'd try putting back the stockie air box back on first before you go trying to change exhausts. That could make a difference to the overall noise level.

Is there anything (safe) you can stick in say, the dump pipe to deaden the noise for a little bit. Like stick in and then pull it out later?

[Guest INASNT]

Lozza150

i got a full 3 inch from turbo back. Not the loudest sysem around but at 3000rpm it will be over 90db for sure.

pred

the stock airbox wont make much difference to the exhaust sound.I am gonna chuck a stock cat back on for the test then swap it after