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Old 03-15-2014, 09:46 AM   #1
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NOx Emissions on the vig

Took the vig to the Air Care Colorado station for the pre-plates inspection...and she failed.

Prior to purchase, as you all know, had a mike D tune with all the hardware minus an IC and turbo intake pipe.

Since purchase, I've added the GS IC and intake pipe, and the car now operates at 5,300 feet where as the tune was at sea level. (no modifications to the tune)

HC GPM was a pass, CO GPM was a pass, CO2 GPM was a pass, but the NOx GPM came in at 2.3908 with a 1.5 limit and failed...after two attempts.

The test is run through 1st and 2nd gear up to 60, was about 52 degrees today.

Is this a matter of a re-tune or might there be a simpler and less expensive solution(s) to try first? The notes on this emissions test for high NOx say "High NOx readings are the result of high combustion temperatures and/or pressures"

FYI I ran the car at highway speeds, on and off boost for a good half hour before the test.

Any help would be much appreciated.
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Old 03-15-2014, 10:45 AM   #2
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aside from buying a used DP just for the test...
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Old 03-15-2014, 10:57 AM   #3
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Run the car in second and third, make sure they have a huge fan pointing at the front, run high oct gas, turn heater on full when testing.
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Old 03-15-2014, 11:02 AM   #4
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Run the car in second and third, make sure they have a huge fan pointing at the front, run high oct gas, turn heater on full when testing.
Unfortunately they don't allow any modifications on the test. Unlike PA, Colorado has this "assembly-line" for testing and its state run. They test by the books without requests....
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Old 03-15-2014, 11:39 AM   #5
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Maybe just find another center for the test, they could have a funky machine.
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Old 03-15-2014, 12:15 PM   #6
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If everything passed but NOx you need a catalytic converter, yours isn't working 100% anymore.
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Old 03-15-2014, 12:27 PM   #7
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If everything passed but NOx you need a catalytic converter, yours isn't working 100% anymore.
Sigh.

Instead of swapping in/out a used stock DP in hopes it would pass, I'm wondering if a Genuine Saab D/P with california obd2 cat would be a better investment. Anyone have experience with these?

The thought of removing the somewhat rusted 6pt subrame brace made me puke in my mouth...

Last edited by PAviggen; 03-15-2014 at 12:36 PM.
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Old 03-15-2014, 03:26 PM   #8
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Had one fail with a race cat, but lack of cat will do it. See if you can get a Summit racing cat and have it welded or clamped in. I ended up with a 3" both sides for a 3" DP.

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If everything passed but NOx you need a catalytic converter, yours isn't working 100% anymore.
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Old 03-15-2014, 05:00 PM   #9
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Had one fail with a race cat, but lack of cat will do it. See if you can get a Summit racing cat and have it welded or clamped in. I ended up with a 3" both sides for a 3" DP.
Crossed my mind but was concerned about the placement of the rear O2 sensor. I know they can be fickle, and I trust Taliaferro's precise placement rather than a 3rd party welder. Choices, choices.
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Old 03-15-2014, 10:27 PM   #10
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If you don't have a wide band air fuel setup you should get one. Either AFR is off in those load ranges, or your cat is no good, or both.
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Old 04-04-2014, 04:28 PM   #11
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REALLY impressive results with the GS V2 DP with cali cat:

HC GPM 0.0551 (limit 1.2)
CO GPM 0.4728 (limit 15.0)
NOx GPM 0.1447 (limit 1.5)

No noticeable difference from the butt dyno either. Extremely happy with the results!
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