bored smog tech here

[s14canyoncity]

Originally Posted by palmdale_mob

Okay so dumb question, do I have to smog my car every year or every other year for registration?

Its an s13

every other year.

[Z U L8R]

Relatively vague/unimportant question

1. at what temperatures in the cylinder (or exhaust gas) does nitrogen start to break down into nitrous oxides at an environmentally harmful level?

More important/actually would like to know question

2. what is the average level of NOx ppm at 1600 degrees F of exhaust gas temperature?

i've been wanting to talk to combustion engineers to get this answer to then see if creating an affordable nitrous oxide sensor would be beneficial or redundant for tuning....with the intention of warning the user if they're reaching a level where knocking/pre-detonation is more likely to occur.

then establish whether it's redundant or more effective than just measuring egt's alone or if it's a waste since it's measuring a by product of egt's essentially....

basically just brain storming whether or not this sensor could be more or less useful/accurate than just an egt guage since instead of just measuring the heat and not knowing the chemical composition, it can measure the chemical composition similar to a wide band a/f guage, thus possibly being a useful tool for tuning....or a redundant waste of time and money

Dave

[EDacIouSX]

Ok yes yes I know, old thread. But this is pretty relevant since it's a new law taking effect this January. Here's the link: http://www.smogtips.com/new-smog-law-AB-2289.cfm

How will this effect smogging? Will it be much more difficult to smog a 1996-98 S14 since it now goes through the OBD Port and not the sniffer? And, it said something about pulling the VIN # off the ECU. WTH? Vin numbers are stored on the ECU? Can anyone clear some of this up?

[Turtle]

I believe thats talking about the new obd system they're coming out.

I didn't read the page since link is broken for me but im assuming thats whats it talking about

[chris_s13]

yo my nox level is sill high. seafoam the car, gave her a tune up and installed a new cat with. also clean everything but still running high nox and i failed at least 10 times

[EDacIouSX]

Originally Posted by chris_s13

yo my nox level is sill high. seafoam the car, gave her a tune up and installed a new cat with. also clean everything but still running high nox and i failed at least 10 times

I had this problem, High nox is due to your EGR not working properly (EGR helps keep the cylinders cool, hot cylinders = more nox). One of my hoses was collapsed, fixed that and it worked like a charm. But, there's more to your EGR than just the hose but start at the vacuum hoses for your EGR. If not, change/clean your EGR. S13s a little different but it should be in the same area, it's located on the passenger side at the back of your head. Looks something like this:

http://forums.nicoclub.com/240sx-egr...l-t427162.html



I updated the link on my post.

[xErniexChaosx]

Hey OP do you still work at smog shop?

[Carbonsnail]

Are you still answering questions regarding the
CA SMOG test? I have one. Thank you.