Passed my final emissions test!

Asterix

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My last emissions test on my '88 NA was yesterday and I thought I'd share the results. Since it'll be 25 years old (from the model year) in 2013, I won't need another test. It passed again this time, though with less margin than last time. This is a treadmill/dyno test done at the same station both times.

Of course, there are many variables that could cause the numbers to change, but I did make one big change to the car between these tests. Two years ago I had a fairly new Bosel cat back exhaust on the car, which is fairly restrictive (but quiet). Now, I have one of Raptor Racing's 2.5" cat back systems, except I put in a Hushpower II resonator. The straight-through resonator Raptor sold me was way too loud. The muffler is a Magnaflow. The catalytic converter is original, but the O2 sensor is only about 30k miles old (engine rebuild).

Code:
miles	229510		239808	limit
15mph (2nd gear)
HC ppm	55		52	92
CO%	0.10		0.04	0.37
NO ppm	128		367	1200
rpm	1782		1829

25mph (3rd gear)
HC ppm	143		162	167
CO%	0.25		0.22	0.53
NO ppm	290		578	1167
rpm	1890		1962
Since the CO% dropped and NO went up, my first thought was it's running leaner. But the HC also went up. It's not using any more oil than it used to. The 25mph test is first, then the 15mph. Maybe the catalyst was a little colder this time, but warmed up for the 15mph test.

The engine is much happier running at 1800rpm with the 2.5" exhaust than with the Bosel, though I almost never drive at that rpm.

Any other ideas/comments? It's running great. I do need to check the air filter since I don't recall when I changed it last.
 

Asterix

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Sometimes I wish I could run this test again, as it's a good check of how the engine is running, fairly cheap. Too bad the emission stations won't run it except for inspection. I'm sure there's someone near me that has the gear, but it won't be as cheap.
 

Jonnymkiii

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In Colorado, for most counties, we still need emissions tests every two years, even for a 33 year old car, lol.
 
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Abe's 1987

Si vis pacem, para bellum
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Texas only requires up to 25 years old car to get an emissions test with safety. After 25 years it is only safety checks. Well at least in the major cities.
 

Asterix

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I'm still passing VA safety inspection every year so I can keep my regular tags. It's an easy test.
 
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debrucer

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I'm still passing VA safety inspection every year so I can keep my regular tags. It's an easy test.
Virginia was awful with a visibly modified car. That's were I was in 1983 with a 1977 Triumph TR7 and an 83 231 ci Buick V6. By the numbers it was cleaner than anything required, but as for systems, it had to have the system of the 77 Triumph... of which it had none. With that experience, for me, California has been a breeze.
 

Asterix

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True, @debrucer , some inspection stations go strictly by the book. The state police are good about policing the inspection stations, so if you get a strict one, they probably got caught recently.

Technically, my Supra should not pass because it does not have the OEM exhaust the law requires. However, I've not had trouble so far. I go to the same station every year, so they know I'm not a ringer.
 
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Abe's 1987

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I had a buddy do favors for inspection passing here in houston and the buddy got caught. He is on a thin thread now so no more favors from him anymore.