Jump to content
SAU Community

Recommended Posts

hey mate

Yes i did lose quite a bit of power. I still have the same cat on since the test i think its 2 and 3 quarter inch.

not interested in power atm.. i gotta upgrade the fuel pump and retune it on boost to go for around 350 - 380rwkw so I am going to invest into a 4" high flow cat which will cost around $400.

For now i will go back to using my xforce 3" highflow

Is it restrictive?

Did you loose much more power when you used this cat?

  • Replies 185
  • Created
  • Last Reply

Top Posters In This Topic

IF it does cost that much in VIC to get the test then you should look for a tuner that has a 5gas sensor system and pay him to tune it so you can pass the test the first go.

i cant stress how important it is to get a HIGH quality cat that has been proven to remove emissions. Catco is the way to go - i believe there is one that is a little better.

What was the procedure for the test? What did they do...

Max 4 min test on a dyno designed to simulate various load conditions (eg normal driving). Will stop earlier if it has clearly passed/failed the test, otherwise will continue for the full 240 seconds (hence the name).

The full 240 second test simulates driving over a 3.1 km course with an average speed of 47.3 km/h and a maximum speed of 91.2 km/h.

wooahhh.. nice answer :(

but they never stopped when i went the first time and leaned it off and the nox went up like nothing else :) they kept going and gave me a print out.

if you look at the sheet that i posted you can see the different gas's and the speed that the car was going as well. the top line is the speed the bottom is the emissions - as you can see its very low on bottom one. i should scan my first test and show you.. its pretty interesting the differences between the 2 tunes.

They drive it for around 30 seconds and then they come to a complete stop then keep going and then get up to 90ks an hour and cruise then come to a complete stop.

I think a stock turbo r33 would go into boost - so maybe disconnecting the actuator might help ;)

Max 4 min test on a dyno designed to simulate various load conditions (eg normal driving). Will stop earlier if it has clearly passed/failed the test, otherwise will continue for the full 240 seconds (hence the name).

The full 240 second test simulates driving over a 3.1 km course with an average speed of 47.3 km/h and a maximum speed of 91.2 km/h.

UPDATE !!

I passed the noise test today!!! just scraped in by 1db :)

got 87db at 3500rpm and 89db at 4000rpm

So now its smooth sailing to my engineers certificate !! just got to brace the huge hole i got the 3" intake pipe going through and take it back and pay my money!

UPDATE !!

I passed the noise test today!!! just scraped in by 1db :ninja:

got 87db at 3500rpm and 89db at 4000rpm

So now its smooth sailing to my engineers certificate !! just got to brace the huge hole i got the 3" intake pipe going through and take it back and pay my money!

how have you been advised to do this bracing?

  • 2 months later...

Congrats on passing the emissions testing!

I wonder though, what the point of it was? You say that you pro-actively submitted your car to these tests because you "wanted your car to be legal"...

But you say that you are going to replace the very restrictive catco cat with a 3" and possibly a 4" cat. That will render this passed test obsolete and irrelevant? Are you going to keep this tune, or are you going to lean it out again for greater fuel economy?

Fantastic job building and tuning your own car to a degree that you can control gas emissions to such a fine line, but I have to wonder what the point is, if you're just going to continue modifying your car and render this passed test useless?

The reason i did this was to get my car legally engineered. The way it works is that you must get the IM240 test to get a engineers certificate to prove that the modifications you have made ie - intercooler and plenums and exaust manifolds and injectors and ECU etc etc do not change the emissions of the car.

I have heard that EPA can do road side tests and when they do the legal limits are different to what the RTA is - i have heard that the RTAs IM240 is twice the limits as the EPA so if you get a good high flow CAT the EPA tests will pass without any issues.

Oh and i have not touched the cruise tune since the testing at all as it is fine as it is and still gets good fuel economy but not as good as it was.. bit of a trade off i guess.

Edited by Guilt-Toy
  • 5 months later...
  • 1 month later...

Good to hear is all clear..

I got detoured to an epa station last night.

They got me for;

* Exhaust (noise)

* Air Filter (induction noise)

* non-standard intercooler - turbo

* adjustable fuel pressure regulator

* catch can has a filter on it

Can anyone give me some more advice as to what i should change or do.

Car - 1990 R32 GTR

Current Mods

* PowerFC dejetro

* cams

* Single hi-mount turbo

* bigger fmic

* airfilter

* exhaust

* Fuel pressure regulator

* External Gate

* Catch can

Your help would be greatly appreciated

Dave

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

    • I had 3 counts over the last couple of weeks once where i got stranded at a jdm paint yard booking in some work. 2nd time was moving the car into the drive way for the inspection and the 3rd was during the inspection for the co2 leak test. Fix: 1st, car off for a hour and half disconnected battery 10mins 4th try car started 2nd, 5th try started 3rd, countless time starting disconnected battery dude was under the hood listening to the starting sequence fuel pump ect.   
    • This. As for your options - I suggest remote mounting the Nissan sensor further away on a length of steel tube. That tube to have a loop in it to handle vibration, etc etc. You will need to either put a tee and a bleed fitting near the sensor, or crack the fitting at the sensor to bleed it full of oil when you first set it up, otherwise you won't get the line filled. But this is a small problem. Just needs enough access to get it done.
    • The time is always correct. Only the date is wrong. It currently thinks it is January 19. Tomorrow it will say it is January 20. The date and time are ( should be ! ) retrieved from the GPS navigation system.
    • Buy yourself a set of easy outs. See if they will get a good bite in and unthread it.   Very very lucky the whole sender didn't let go while on the track and cost you a motor!
    • Well GTSBoy, prepare yourself further. I did a track day with 1/2 a day prep on Friday, inpromptu. The good news is that I got home, and didn't drive the car into a wall. Everything seemed mostly okay. The car was even a little faster than it was last time. I also got to get some good datalog data too. I also noticed a tiny bit of knock which was (luckily?) recorded. All I know is the knock sensors got recalibrated.... and are notorious for false knock. So I don't know if they are too sensitive, not sensitive enough... or some other third option. But I reduced timing anyway. It wasn't every pull through the session either. Think along the lines of -1 degree of timing for say, three instances while at the top of 4th in a 20 minute all-hot-lap session. Unfortunately at the end of session 2... I noticed a little oil. I borrowed some jack stands and a jack and took a look under there, but as is often the case, messing around with it kinda half cleaned it up, it was not conclusive where it was coming from. I decided to give it another go and see how it was. The amount of oil was maybe one/two small drops. I did another 20 minute session and car went well, and I was just starting to get into it and not be terrified of driving on track. I pulled over and checked in the pits and saw this: This is where I called it, packed up and went home as I live ~20 min from the track with a VERY VERY CLOSE EYE on Oil Pressure on the way home. The volume wasn't much but you never know. I checked it today when I had my own space/tools/time to find out what was going on, wanted to clean it up, run the car and see if any of the fittings from around the oil filter were causing it. I have like.. 5 fittings there, so I suspected one was (hopefully?) the culprit. It became immediately apparent as soon as I looked around more closely. 795d266d-a034-4b8c-89c9-d83860f5d00a.mp4       This is the R34 GTT oil sender connected via an adapter to an oil cooler block I have installed which runs AN lines to my cooler (and back). There's also an oil temp sensor on top.  Just after that video, I attempted to unthread the sensor to see if it's loose/worn and it disintegrated in my hand. So yes. I am glad I noticed that oil because it would appear that complete and utter catastrophic engine failure was about 1 second of engine runtime away. I did try to drill the fitting out, and only succeeded in drilling the middle hole much larger and now there's a... smooth hole in there with what looks like a damn sleeve still incredibly tight in there. Not really sure how to proceed from here. My options: 1) Find someone who can remove the stuck fitting, and use a steel adapter so it won't fatigue? (Female BSPT for the R34 sender to 1/8NPT male - HARD to find). IF it isn't possible to remove - Buy a new block ($320) and have someone tap a new 1/8NPT in the top of it ($????) and hope the steel adapter works better. 2) Buy a new block and give up on the OEM pressure sender for the dash entirely, and use the supplied 1/8 NPT for the oil temp sender. Having the oil pressure read 0 in the dash with the warning lamp will give me a lot of anxiety driving around. I do have the actual GM sensor/sender working, but it needs OBD2 as a gauge. If I'm datalogging I don't actually have a readout of what the gauge is currently displaying. 3) Other? Find a new location for the OEM sender? Though I don't know of anywhere that will work. I also don't know if a steel adapter is actually functionally smart here. It's clearly leveraged itself through vibration of the motor and snapped in half. This doesn't seem like a setup a smart person would replicate given the weight of the OEM sender. Still pretty happy being lucky for once and seeing this at the absolute last moment before bye bye motor in a big way, even if an adapter is apparently 6 weeks+ delivery and I have no way to free the current stuck/potentially destroyed threads in the current oil block.
×
×
  • Create New...