Jump to content
SAU Community

Recommended Posts

im currently trying to get my R31/RB25 turbo registered in NSW. took it for an emissions test today and completely failed

using all stock parts for the emissions test bar a 3" exhaust, turbo is at 7 psi.

high flow CAT(i think this may be causing alot of the problem it may be screwed)

any advice on wtf went wrong would be great

here are the test results.

post-88957-0-21318200-1320668750_thumb.jpg

Edited by r31rb25help
Link to comment
https://www.sau.com.au/forums/topic/382353-rb25-failed-nsw-emissions-test/
Share on other sites

Yep.

And why do u need an emmisions test with a standard ecu? Have the rules changed? Try another engineer

apparently i need the test because the engine im using is imported.

im thinking i should just replace the entire exhaust system on it for something with passing this damn test in mind

and i dont know what to to about it dumping about 2x the fuel its allowed to into the exhaust at the moment,

Edited by r31rb25help

dug up my old stock exhaust and put 2 3way CATs on it after some advice from a mechanic, looks like horrid and runs horrid but it will apparently pass.

he also recommended i dont run my intercooler at all just a "straight" pipe.

dug up my old stock exhaust and put 2 3way CATs on it after some advice from a mechanic, looks like horrid and runs horrid but it will apparently pass.

he also recommended i dont run my intercooler at all just a "straight" pipe.

blink.gif

He's trolling for sure. Ask him if he will pay for the new engine after yours goes bang from detonation?

apparently i need the test because the engine im using is imported.

im thinking i should just replace the entire exhaust system on it for something with passing this damn test in mind

and i dont know what to to about it dumping about 2x the fuel its allowed to into the exhaust at the moment,

why is it dumping 2x fuel it should be into the exhaust? if it is overfueling heaps then theres no way it will pass have you got bigger injectors in it or something?

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

    • So I'll put filler past the repair area a bit to make sure I don't miss anything. Then I'll block it until it's almost level, put the guidecoat, then keep blocking until it's gone. Then it's still wavy.  In regards to hitting the panel, I saw this video might give more context - Skip to 0:47 he knocks it down. But yeah I'm sanding until the guidecoat is gone then checking because otherwise my filler is still well above the bodyline. Unless what you're saying is I should put guidecoat around it early, surrounding the filler then stip once it's gone?
    • I refreshed the OEM injectors with the kit and connected it up. It now ideals okay even with the IACV removed. Driving still has the same cutoff issue like the 550cc injectors so the issue is somewhere else. I bought FPG's Fuel Pump Hanger. I will be installing it next, but it is not as straightforward as I thought it was with my limited wiring knowledge and no instruction on the specific model I purchased (FPG-089). I also got the incorrect billet clamp as I could not find info on the OEM sizing.
    • Stop looking at the garage floor, and turn the radio up a bit louder if there's any strange noises...
    • No. Turbo shuffle and surge/flutter are not the same thing. Specifically, on a GTR, turbo shuffle has a definite meaning. On a GTR, the twin turbos are assumed to be the same thing and to operate the same way, exactly. In reality, they do not. Their exhaust sides are fed and exhaust a little differently, to each other. Their inlet sides are fed and exhausted a little differently, to each other. Consequently, when they are "working" they are often at slightly different points on the compressor map compared to each other. What this means, particularly when coming on boost, is that one of them will spool up and start producing extra flow compared to the other, which will put back pressure on that other compressor, which will push the operating point on that other compressor up (vertically). This will generally result in it bumping up against the surge line on the map, but even if it doesn't, it upsets the compressor and you get this surging shuffle back and forth between them That is "turbo shuffle" on a GTR. It is related to other flutter effects heard on other turbo systems, but it is a particular feature of the somewhat crappy outlet piping arrangement on RB26s. There are plenty of mods that have been attempted with varying levels of success. People have ground out and/or welded more material into the twin turbo pipe to try to prevent it. Extending the divider inside it works, removing material doesn't. There are aftermarket replacement twin turbo pipes available, and these exist pretty mush purely because of this shuffle problem.
    • You can temporarily* use lock collars to keep it in place until you can do the bushes, back the nuts off, slide them in, snug back up. *temporarily is often for ever
×
×
  • Create New...