your lack of backpressure on the EGR i would think if the motor has an egr.....

 

There is no EGR because its a JDM motor. I also had the silencer on the muffler which reduced the 3" to 2.5".

 

There is no EGR because its a JDM motor.

This... is why you fail... lol

EGR exists to control NOx emissions. How it works is beyond the scope of this post. Just know that you need one. You'll have to swap to a USDM head and intake manifold so that you can bolt an EGR up. The you'll have to find a way to control it. If done right, it should pass as clean as any US spec model.

Collin

 

Hi,
I think that you have retarted ignition,
JDM cars run on 102+RON rocket fuel and is very possible that your ECU "see" knocking on 95RON,
The detection of knocking is very advanced in Toyota OBDI

 

^ i disagree.

zazzn ran his aristo car untouched and he passed with flying colors, with way better emissions results than most newer cars.

my car passed with flying colors without an egr as well.

something is wrong with your engine or the way it is running like said above, maybe timing. the silencer added to the backpressure which creates more heat, and that's what NOx is, so i might try pulling that silencer. also check codes, air filter, pcv

 

Hella crazy, passing with a EGR... but yeah, in most cases, w/o an egr, it would cause high NOX... aight peace :chicken:

 

Can timing be adjusted? I thought the ecu controls it.

 

ignition timing is controlled by ecu, unless there are some problems with the sensors (cam/crank/knock/tps).

check your tps to see if it's within spec.

valve timing can be off by a tooth and mess everything up too

 

Slip the guy an extra hundred...passed!

 

No EGR = FAIL no matter how you look at it. Fails visual & sniffer. Especially in Cali.

 

*Sigh*

Mine pass exhaust emissions just fine 2 times, no egr, no special anything, just 91 octane and a full 3inch exhaust.

Oh, and this is in Cali by the way.

 

california is the only exception, your car WILL pass the sniffer if it's in good running condition with a good/new cat. it has been done, no sense in saying it's not possible. i've done it with a 7m-gte, and zazzn has done it with his aristo 2jz.

 

1. NOx is a result of high heat and compression
2. EGR (exhaust gas recirculation) lets exhaust gasses(CO2) back into the intake manifold to take up space as an "inert to burn" gas, thus lowering the temperatures in the combustion chamber.
3. NOT ALL CARS HAVE/NEED EGR, i live in cali neither of my 2 porsche 944's had egr. so i read up on it.

 

100% correct!

The guys above were able to pass because they were not being tested by CA standards.

It is true that many cars do not use an EGR, and I can't tell you exactly how they manage to emit low NOx. I have not personally done enough research. Can anybody shed some light on this for me?

Collin

 

Uh, talking about that isnt allowed here I believe.
And I wouldnt give that information out anyway even if it was.

 

I just passed emissions the other day and in fact I ran into the same problem as you as my nox where to high, I raised my fuel pressure from 39psi to 42psi and I passed with flying colors

HC 0.88 1.60
CO 9.00 15.00
NOX 1.78 2.50

 

I don't understand. How does raising fuel pressure lower NOx? Is that the same as increasing A/F ratio?

 

it lowered his NOx because he was probably running lean, and as we all know, running lean increases your EGT's (which is heat), and therefore increased his NOx.

what would be interesting to try is running meth while doing the emissions test, should be very interesting.

 

yup that is correct thank you for verifying that.

 

You can also hook up a Hydrogen feed to your intake and that will lower numbers by quite a bit.

 

where the hell do you get hydrogen gas? isn't hydrogen explosive? fuck, with my luck my car would blown up on the dyno

 

so i gasoline vapor, and its not explosive its combustible with oxygen creating water,
it burns at a cooler temperature then gasoline too, ever hear of fuel cell cars?

plus meth may throw of the CO readings, but there is no reading for hydrogen on the smog dyno.

 

You get hydrogen from electrolysis. Well that is one way. Yes, it is explosive (Hindinberg?), but if you create it as you use it, then no worries as water is self extingushing.

 

Hindenburg didn't explode it cough fire and as the mix of helium and hydrogen was escaping it just burned, unable to keep ballast it dropped to the ground. They really need to get the education system in this country sorted out. Speaking of this country "we"(USA) refused to sell the German blimp helium and sold them hydrogen instead.

 

add about a gallon of 98-99% isoprofyln alcohol from your local pharmacy and try again. I've passed cars with no emissions equipment and no freaken cats with that. setup.

 

This is 1JZ that sat for at least 6 months, had new plugs, Tbelt and all that jazz.
Factory ypipe, 3inch downpipe bolted to factory NA Cat/Exhaust.
These are the results, tested in Cali, and Passed just fine.

This is from an old post, cant find the smog paper to show the NOx but, it passed either way so, their you have it.

Idle - Max - Results
HC - 120 - 107
CO - 1.00 - 0.03

2500RPM - Max - Results
HC - 140 - 40
CO - 1.00 - 0.04

 

...so deck....did you pass? if so, how?

i have to get my car inspected when i get it back...so i'd like to pass my first time instead of having to deal with failing and going back

 

I have'nt gone back yet. Do you know how many times you're allowed to fail
before they tell you have to get it fixed? And if you don't pass do you know
of somewhere? If you know what I mean. PM me if you know someone.