Jump to content
SAU Community

Recommended Posts

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

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

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.

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

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

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

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.

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

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.

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



  • Similar Content

  • Latest Posts

    • Have a look at that (shitty) pic I posted. You can see AN -4 braided line coming to a -4 to 1/8 BSPT adapter, into a 1/8 BSPT T piece. The Haltech pressure sender is screwed into the long arm of the sender and factory sender (pre your pic) into the T side. You can also see the cable tie holding the whole contraption in place. Is it better than mounting the sender direct to your engine fitting......yes because it removes that vibration as the engine revs out 50 times every lap and that factory sender is pretty big. Is it necessary for you......well I've got no idea, I just don't like something important failing twice so over-engineer it to the moon!
    • Yup. You can get creative and make a sort of "bracket" with cable ties. Put 2 around the sender with a third passing underneath them strapped down against the sender. Then that third one is able to be passed through some hole at right angles to the orientation of the sender. Or some variation on the theme. Yes.... ummm, with caveats? I mean, the sender is BSP and you would likely have AN stuff on the hose, so yes, there would be the adapter you mention. But the block end will either be 1/8 NPT if that thread is still OK in there, or you can drill and tap it out to 1/4 BSP or NPT and use appropriate adapter there. As it stands, your mention of 1/8 BSPT male seems... wrong for the 1/8 NPT female it has to go into. The hose will be better, because even with the bush, the mass of the sender will be "hanging" off a hard threaded connection and will add some stress/strain to that. It might fail in the future. The hose eliminates almost all such risk - but adds in several more threaded connections to leak from! It really should be tapered, but it looks very long in that photo with no taper visible. If you have it in hand you should be able to see if it tapered or not. There technically is no possibility of a mechanical seal with a parallel male in a parallel female, so it is hard to believe that it is parallel male, but weirder things have happened. Maybe it's meant to seat on some surface when screwed in on the original installation? Anyway, at that thread size, parallel in parallel, with tape and goop, will seal just fine.
    • How do you propose I cable tie this: To something securely? Is it really just a case of finding a couple of holes and ziptying it there so it never goes flying or starts dangling around, more or less? Then run a 1/8 BSP Female to [hose adapter of choice?/AN?] and then the opposing fitting at the bush-into-oil-block end? being the hose-into-realistically likely a 1/8 BSPT male) Is this going to provide any real benefit over using a stainless/steel 1/4 to 1/8 BSPT reducing bush? I am making the assumption the OEM sender is BSPT not BSPP/BSP
    • I fashioned a ramp out of a couple of pieces of 140x35 lumber, to get the bumper up slightly, and then one of these is what I use
    • I wouldn't worry about dissimilar metal corrosion, should you just buy/make a steel replacement. There will be thread tape and sealant compound between the metals. The few little spots where they touch each other will be deep inside the joint, unable to get wet. And the alloy block is much much larger than a small steel fitting, so there is plenty of "sacrificial" capacity there. Any bush you put in there will be dissimilar anyway. Either steel or brass. Maybe stainless. All of them are different to the other parts in the chain. But what I said above still applies.
×
×
  • Create New...