Jump to content
SAU Community

Another Decc Thread

SECURITY

By SECURITY,
in New South Wales

 Share

Recommended Posts

SECURITY Grand Master

SECURITY

Posted
Posted

so i got the letter in the mail and now im starting to wonder if its worth my time to go through the process or just strip out my car.

ive been reading some conflicting information on it and so far ive got the following questions.. if anyone could help it would be great ;)

1. which cat? i spoke to one of the workshops and they said any standard cat. it doesnt need to be nissan but it just cant be anything hi-flowed.

2. ive got a front mount. ive also read that as long as your emissions comply then they wont send you to the EPA because of a front mount. if i get rejected because of my front mount i think ill just strip it. ive got a front facing plenum and it will be just too much of a hassle to get it back to the side mount.

3. do i need to replace the whole exhaust? or can i just make my exhaust quieter by adding a muffler?

i tested my current exhaust and it sits at 89-90db @ 4800rpm. i did it with an iphone app so i doubt its right, but its supposed to be accurate to 2db. either way i'll be making it quieter, i just want to know if thats okay or if it NEEDS to be standard.

4. if i get an engineer certificate for the front mount, plenum and fixed exhaust, does anyone know if it will make a difference?

5. whats a good AFR to send the car in with? and timing?

Link to comment
https://www.sau.com.au/forums/topic/338654-another-decc-thread/
Share on other sites
  • Replies 51
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

phatlavish Mentor

phatlavish

Posted
Posted

1. I reckon they would pass any stock-looking cat, I think many people have passed with one of those magnaflow cats as well? pretty sure it also needs one of those bungs in it for that exhaust temp sensor that hangs near it

3. just has to pass the volume test - 90db @ 4800rpm, at 1 meter measured diagonally from the rear muffler. doesn't have to be the factory catback

Dahtone Racing Grand Master

Dahtone Racing

Posted
Posted

You need to have all emission gear functioning correctly

You will have to refit your side mount intercooler

You need a cat with nissan stamped on it.

The exhaust doesn't need to be stock it just needs to pass the noise limit.

What will happen is the workshop will take photos and do a noise test

Then they will send the results to the EPA.

If the EPA is satisfied that that car has not been Tampered with they will send you a letter of compliance.

If not they will call you in for a full emissions test.

UWISSH! Grand Master

UWISSH!

Posted
Posted

you can pass with a front mount but not 100% about the plenum.

any cat will do as long as it isnt hi flowed.

go n get a 2 1/2" exhaust made or try n borrow a stock one.

hide boost controller and any other controller you have

u need factory air box and snorkel

carbon canister

thats what i remember from when i went thru it a couple years back

s13_Skyline_inside Proficient

s13_Skyline_inside

Posted
Posted

you can pass all of it if you get a tune and a cat to pass emissions and put all your emission control stuff on etc, but that a few grand down the track including engineers cert.

you'd need to pass the im240 emissions test if you were to get an engineers cert anyway

Dahtone Racing Grand Master

Dahtone Racing

Posted
Posted

its gotten tougher

they wont pass intercoolers that aren't stock, you need all the factory emission control items fitted and operating

we've been doing a lot of this stuff lately

so we pretty much know exactly what has to be done to pass the car first time every time

SECURITY Grand Master

SECURITY

Posted
  • Author
Posted
Joe did you get stopped and get told to expect the letter or was it a random one in the mail?

i got stopped and defected a few weeks ago mate. worst thing is i was expecting it in the mail!

If the car passes the IM240 with a 5 inch cat, intercooler, FF plenum etc then what is the big deal? A pass is a pass regardless of what is on the car?

thats right, i did a bit of calling around and one of the workshops said that if you go to the IM240 test first with an intercooler and passed, he can take a copy and send that off to the DECC and that should be the end of it. the key word there is should.. its not guaranteed.

im going to give that one a go.

mr 32 Grand Master

mr 32

Posted
Posted
i got stopped and defected a few weeks ago mate. worst thing is i was expecting it in the mail!

thats right, i did a bit of calling around and one of the workshops said that if you go to the IM240 test first with an intercooler and passed, he can take a copy and send that off to the DECC and that should be the end of it. the key word there is should.. its not guaranteed.

im going to give that one a go.

that sucks

might be worth talking yavus, i belive he worked in emissions testing for a while

MBS206 Grand Master

MBS206

Posted
Posted
i got stopped and defected a few weeks ago mate. worst thing is i was expecting it in the mail!

thats right, i did a bit of calling around and one of the workshops said that if you go to the IM240 test first with an intercooler and passed, he can take a copy and send that off to the DECC and that should be the end of it. the key word there is should.. its not guaranteed.

im going to give that one a go.

If it passes, and you send it off, the only thing they can do from there, is invite you into the DECC stations and do another IM240. When you pass again, you'll be all good.

SECURITY Grand Master

SECURITY

Posted
  • Author
Posted
that sucks

might be worth talking yavus, i belive he worked in emissions testing for a while

yeah i might give him a ring if i fail the IM240 test with my home-job tune.

If it passes, and you send it off, the only thing they can do from there, is invite you into the DECC stations and do another IM240. When you pass again, you'll be all good.

yeah thats the worst case scenario, i plan on getting all the parts swapped over in a week - i'll see if i can make it to the IM240 test in time before my inspection date.

Im going through this process at the moment.

Ill have an engineers cert and a pass on an IM240 test. Cant see why i wont pass.

from what i gathered, as long as you can prove that you pass the IM240 test and pass the DECC noise test then you should be fine - just keep the car the way it was at the IM240 test till you get a response from the DECC. my only concern after all of this is to get all of my aftermarket gear engineered - i dont want to go through this again. sucky thing is, the car is worth jack all.

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • hypergear
      Hypergear Turbochargers and High flow Services Development thread

      By hypergear · Posted

      Updating results following our SR20det project. Data collected form improves future turbocharger making and high flowing services. So far differences between G and GT series turbine wheels, we are in the process of making a new turbine, the aim is for better mid top range flow without gain too much lag.  Result is back to back comparison of G25-660 and GTX2867 spec turbochargers on the same car, nothing changed apart from turbocharger. Both tuned to knock limit from pump 98 fuel (US Ron93). GTX2867 was about 400RPM more responsive making 255rwkws while G25-660 made 17 extra Kws with wider spread of torque after 4500RPM finishing off at 272rwkws.  
    • romel
      Swapped rb25de neo how to get the gear indication on the dash to work

      By romel · Posted

      @GTSBoy i tried to jumper the wires and got the steering wheel light to come on which is right under the gear indication but that still doesnt come on.  Can it be an issue with my cluster?
    • GTSBoy
      Swapped rb25de neo how to get the gear indication on the dash to work

      By GTSBoy · Posted

      Given that you have seen the dash indicator work briefly, then it would seem like you have a simple wiring problem. What happens when you simply jumper the wires on the "steering wheel switch"?
    • MBS206
      The Ls1 R33 Of Fury

      By MBS206 · Posted

      Yesterday's day in review: All the wiring to the lights up the front how I want it, is ran, terminated, and all to length. The only lighting up front I haven't finished is the side indicators, as I need to get to the partly cutup factory loom, and find the plugs for them. Interesting note, the side indicators use the exact same plug that's in the doors for something else that I don't remember what it is... So that plug better be careful...   Power steering solenoid, on the R33 is variable, and from memory PWM. The Ford's control from the docs I have so far, is it's just a on or off control. So I'm not sure it's what I want, and in any case, power steering running, but at its heaviest (solenoid off) is likely what I'll want anyway, so I'm not yet touching it at all. All the wiring I can complete so far, is done. There are 3 wires I need to make a plug for at the ECU, and these are just for the vehicle speed sensor, of which I need to get a T5 from an AU, so I can use its output that has the speed sensor on it. (My car doesn't have ABS, otherwise I'd set it up to use one of the ring gears on that). I need to buy new headlight globes and front parker globes, otherwise I could show photos of lights working. Current fuel lines in and out on this motor are "5/16". I'll order hardline, and some AN fittings for that, and I just need to 100% check fuel line size at the tank end, to get the ends for it. I'm also looking at a few options for the banjo bolts to AN fittings for the power steering rack. I'll pull the reservoir off the Barras PS pump. There's an off the shelf fitting for that pump for a -10 AN feed, and it'll use a 16mm to dash -6 an outlet to feed the rack. I'll be making my own power steering reservoir, I'm going through the thought process at the moment of how I'll run the baffles, and I need to research another idea for it too.
    • MBS206
      Coc or nox of nissan skyline

      By MBS206 · Posted

      Two inlet runners changes the engines characteristics requiring less fuel to make torque at different points in the rev range. The smaller diameter inlet runners on the DET increases air flow speed, which improves atomisation of fuel, particularly in low load/idle for better burn, and in specific areas of the engine, (areas you would use when driving normally) increases the efficiency. All of those items change how efficient the engine is at different speeds. The changes on the neo help slightly to improve emissions where it matters. The overall improvements won't be the likes of going from an engine built in the 70s to an engine built in the 2000s, it's just a small step. But still leaves it the RB with the best chance of improvement.   As for your comment about the whole using a cat to not need to worry about those gases. Two things, no system is 100% perfect. It won't eliminate everything. So reduce the quantity you put into it, you still reduce the output. Two, make that system do less work, and it's likely to survive a little bit longer. Funnily enough to, one trick employed to get cats up to temp, AND to drastically reduce emissions before they get up to temp, is to reduce ignition timing.
×
×
  • Create New...