I don't have a cat on this car. But it needs to be registered. I failed the Memphis sniffer test, but not by very much considering.
HC emmissions: standard is 220 ppm, mine was 1,169.59 ppm. That's a little over 5 times
CO emmissions: standard is 1.2% mine is 5.23% about the same.
So this is my idea, I take my air pump that has been disconnected ever since I got the header and presilencer, I put it in and connect the output to the ait tube on the presilencer to force oxygen into the exhaust.
this I think will do two things, dilute the ppm and cause any unburned fuel to burn off.
Do you think I would be able to pass by doing this or not?

 

Why go through all that trouble, when a new catalyic converter is a sure shot at passing?

People try all these tricks for passing, but all you need is a healthy motor, a cat, and properly functioning emissions equipment.

 

Or you could just run alcohol. Thats the trick I use.

Jarrett

 

first off, what's your basis for "not much considering"? do you know the efficiency of a catalytic converter?
CO is nearly 4.5X what it should be at most.
and hooking your smog pump to your exhaust will do one thing, be a hole in the exhaust. thats what exhausts with holes do, they suck in more oxygen. the air will not magically do anything EXCEPT run up the oxygen reading on the sniffer. your HC will still be through the roof (and PPM is parts per million). your CO will also definately kill you. it takes the cat to make it CO2, not air alone.
in short, this will not work, period.
a smog pump isnt there to pump air into the system, its there to pump air into the catalyst so it can be that, a catalyst. study how catalysts work, there's actually intriguing. i know i was shocked.

 

I am familar with how they opperate, Casio. However, this car doesn't see much road time. but it is illegal to have a non registered car that isn't in a garage. this is going to be a track mostly car. a cat would be a waste of time an power.
the HC and CO are measured in part per million. if you dilute it with any other gas, it will have a lower concentration. Just like lemonade, you can measure the ppm of the sugar. If you add more water the ppm of the sugar will be less.
I said "considering" becuase our combustion camber is less than ideal. because of the apex of the rotor, the fuel/air mixture doesn't burn at the tips in the chamber, it burns in the pipe. this makes our exhaust very dirty. Why do you think they came with three cats?
Anyway, I think since the tests are free and it's only a peice of hose to try it, I think I will do it tommorow and let you guys know.

 

y dont u put a new cat on there, and when u pass, get rid of it and put a pipe there again. thats what i do

 

you can try leaning it out too. pickup a safc or if you have a standalone use it. if you're down on money therea are other ways to trick it (do what a safc does but with potentiometers)

 

i understand a cat is a waste of power, but you're trying to pass emissions, not become the dyno king. they will be diluted, but not solved. and i believe they can tell if there's a hole in the exhaust by the excess oxygen. the number will be higher than normal and if they've been working emissions for a decent period of time, it'd probably be easy to pick off.
sugar and lemonade are not combustion. if you're oxygen is through the roof, wouldn't that hint towards impossibly lean?
burns in the pipe? the exhaust pipe? than how would there be internal combustion? it burns in the phase before it becomes an exhaust, then exits through the ports. the emissions are less than ideal for other reasons. they run richer than other engines and have more overlap. don't always seem to be perfectly tuned, then also their age. very modded cars with a good standalone may pass easier. hell, i flunked 6/6, bought a brand new cat and passed 4/6. BDC passed legally when he had 420whp, and my car was bone stock N/A with a cone filter.
our car came with 3 cats, or i believe 2 are "thermal reactors." we also have 3-way instead of 2-way cats, dealing with even more scenarios. but you can't just add a bunch of cats in a row, only one can be a "main cat." the main cat completes Oxidation Reduction --> Oxidation. i haven't read about the ones that came stock on our car, the only thing i can guess is that they're merely Oxidation Reduction cats. they can't perform the same task as the main cat, that would be ineffectively repetative.

your idea won't work unless the mechanic is a moron. your car would have to be way out of stoich range to meet legal requirements for the CO, HC, and NOx.
if its free, hell, give it a run and see what [s]he says, just be ready to buy a cat, find a hook-up, or turn some road time into all track time.

 

i planned on speaking with a tech about the s-afc idea and leaning my engine out a bit if the HC is too high. the other problem is NOx. if you're NOx is too high, leaning a motor i believe will raise it even more. NOx is a result of heat, and a leaner motor will run higher engine temps. also, this should add a bit of power and save some gas.

 

I love the great state of North Dakota, No emmissions test.

 

so what happened here?
did you
pass?

 

My car wouldnt pass either, so I payed someone $50 to pass it.

 

True story. You can get your car to pass cleaner using alcohol and no cats, than you could with regular gas and a cat.

 

yes, but not with a smog pump and no cat. that was the original topic.

 

I could run alcohol through my car right now and pass the sniffer ( I have everything removed ).

Granted...I would fail the visual, but thats a whole nother problem.

Just run some alcohol through their and youll pass. When youre done, just be sure to get all of it out as it has a bad habit of eathing little rubber parts like fuel hoses

 

yea, i'd recommend he try that instead, though corrosion can be a pain/bitch. but aside that, at least alcohol is proven to work (word of mouth; i haven't tried or seen it). pump plunged into the pipe probably won't pass. actually it just won't, i just had an urge to make a sentence with a bunch of P's...
now go setup your car for alcohol and make some power (though it'd probably be against track rules for specific class).

 

Its not against the rules unless you get caught

 

can I mix the alcohol and gasoline together? would this be bad?

 

I can think of 2 rx7 owners, and one Mark 3 Supra owners that have payed off the emissions folks here in maryland to pass them, the most one of them spent was 80 dollars, test is 40 if you do it on time, and like 80 if you are late.

 

From a post I did a few months ago:

J-rats Recipe for cheating emissions if its ABSOLUTELY necessary:

1. Turn variable resistor to full lean, or as lean as you can get and still run.

2. Trick ACV into pumping air to the cat all the time by removing the FORWARD UPPER vac hose, and capping it.

3. Run 87 octane

4. Run your tank down till your almost empty.

5. 2-3 bottles of alcohol in the tank. Drive VERY GINGERLY to the emissions station.

6. Once you pass go DIRECTLY to a gas station. And fill up.

Jarrett

 

Thats a state??

Lol, we have more people in my county than your state I think