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Smog Test Data
On the BBS a while ago, there were a few SC owners who had removed their cats, and mentioned they had no trouble passing a smog test. I would be very interested if these same people could post their actual test numbers (CO, NOX, HC). I'd like to compare your numbers with my local test requirements.
------------------ Doug '81 SC Coupe (aka: "Blue Bomber") Canada West Region PCA members.home.net/zielke/911SC.htm |
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05-16-2001, 04:21 PM
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I'm not an SC owner, and I don't have to conform to smog regulations, but I believe the problem with the cat was not the actual numbers (which a well-tuned 911 should be able to pass without a cat) but the visual portion of the test, where the presence of all the smog-related components has to be confirmed by the tester.
------------------ Jack Olsen 1973 911 T (3.6) sunroof coupe jackolsen@mediaone.net |
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05-16-2001, 06:19 PM
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I can completely attribute my failed smog not to a cat, but to a failed airbox. I measured with a cat pipe, and it failed miserably, then with a cat, and it still failed miserably and didn't pass until the airbox was replaced. My bet is, you can go with a cat pipe, and if everything else is in order, you'll likely pass.
------------------ Kurt B '84 Carrera Cab. carrera_cabriolet@yahoo.com |
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05-16-2001, 10:03 PM
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Thanks guys, but what I'm trying to find out is what *actual* numbers come up in the smog test without a cat. Locally, a car as old as an '81 SC has quite a bit of latitude to pass, so I'm hoping I won't have to bolt my cat back on just for the test.
------------------ Doug '81 SC Coupe (aka: "Blue Bomber") Canada West Region PCA members.home.net/zielke/911SC.htm |
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05-17-2001, 03:35 PM
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When my SC was stock -euro model-no cat, I got about 400 HC and 1.5 CO if I remember correctly. Well below the limits. I would lean it out and disconnect your 02 if it wont pass on its on and see what happens(it has been about three years now!)
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05-17-2001, 03:46 PM
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Thanks rattlsnak (great username!)
Those numbers are what I'm looking for. Any other "catless" SC's out there with test numbers to share? ------------------ Doug '81 SC Coupe (aka: "Blue Bomber") Canada West Region PCA members.home.net/zielke/911SC.htm |
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05-17-2001, 04:10 PM
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