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Passing smog test UPDATE!

Old 07-07-2008, 03:20 PM
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Default Passing smog test UPDATE!

I couldn't really find information on this so I ask you fine people.

Once again it's time to pass the yearly smog test here in GA. once upon a time it was easy to pass if your ---- was messed up, hand the guy a couple of 20 spots and bingo, passed smog test.
Well given the punishment said testing facility will get now a days, the even mere suggestion of something like that will get you the same looks as though you were talking about killing the president.

Last year I was still in the middle of the build so it wasn't really an issue just to rip the turbo off, make it NA, threw on a converter gave it some timing and it passed. (this without egr/pcv system operational)

The question is, in theory if I threw a converter on it with the turbo, (with or without o2 sensor enabled?) and it wasnt running to rich, could it pass?

94 civic, b16a SiR2 swap....


things i've learned so far about emissions:
NoX.....oxides of nitrogen...that when introduced into the converter are converted to water vapor...interesting fact i also learned that this reaction cannot take place with oxygen present, therefore an exhaust leak pre-cat will introduce o2 into the stream and will most likely cause a car even with a new cat to fail for Nox....

dunno thought I'd throw in that random tidbit....anyways....help?
CivicOCD is offline  
Old 07-07-2008, 04:26 PM
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Default Re: Passing smog test

Do they plug into the diagnostic port at all? Or is it just the tailpipe sniffer?

Not much help, just throwing things out there. We havn't had smog tests in MN for a long while now.
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Old 07-07-2008, 04:41 PM
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Default Re: Passing smog test

No ports, thats generally OB2, nope this is the sniffer/dyno
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Old 07-07-2008, 04:52 PM
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Default Re: Passing smog test

In MD we have to go every 2 yrs. and I just slam the car on the ground via coilovers and bitch that the dyno will tear off my brand new exhaust..... Worked the past 2 times for me.

Just remember if you try to go through legit that if the car is runnin too rich it will fail of course. Also if its too lean it will fail.
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Old 07-07-2008, 08:46 PM
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Default Re: Passing smog test

if you go in and fail as the car sits try diluting the gasoline with E85 if you can get it.


that worked wonders for some people i tuned in denver where they have emissions tests
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Old 07-07-2008, 11:12 PM
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Default Re: Passing smog test

Originally Posted by ComputerJLT
if you go in and fail as the car sits try diluting the gasoline with E85 if you can get it.


that worked wonders for some people i tuned in denver where they have emissions tests
alcohol burns much cleaner
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Old 07-10-2008, 06:00 PM
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Default Re: Passing smog test

Well I passed today! with the turbo on the car, I put a cat on it, and failed the first time for Nox, This was mostly due to engine running hotter than it was supposed to because the guy didnt have a fan in front of the car blowing fresh air accross the intercooler/radiator

I brought it back home and removed the thermostat, put in some water-wetter, backed the timing off a couple degrees.
drove it around 30 min to get the cat nice and warm, engine temp was sitting at only 1/4 up the gauge, went in for retest and passed with flying colors!

That being done, time to rip the cat back off, flip the turbo around and drive to Asheville to see JD!

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Old 07-11-2008, 05:26 AM
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Default Re: Passing smog test UPDATE!

Ohio had no NOx standards for OBD-1, so a D15B7 lean and mean without a cat could pass with ease.
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