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Drop DB of Exhaust

Guest INASNT

By Guest INASNT,
in General Automotive Discussion

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Guest INASNT

Guest INASNT

Posted
Posted

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? :D

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Leewah Veteran

Leewah

Posted
Posted

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.

Guest INASNT

Guest INASNT

Posted
Posted

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.

MotoX Veteran

MotoX

Posted
Posted

"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 Grand Master

ed

Posted
Posted
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 :D

ed Grand Master

ed

Posted
Posted
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 :D

sidewaysmambo is testing an aftermarket one out...

MotoX Veteran

MotoX

Posted
Posted

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 Proficient

Lozza150

Posted
Posted

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 Grand Master

predator

Posted
Posted

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?

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