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Old 09-04-2008, 12:12 PM   #1
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Default Passed emissions, hooray

State inspection emissions can be a pain to pass with turbo cars! Thank you for those that posted their results in other threads - they were helpful. Here's my results so it can help others too.

This is on a 1.8L 1995 Miata, T25 turbo no EGR, MSPNP with high res 10g code, and closed loop turned on (wideband corrected, AFR table targeted).

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Old 09-04-2008, 12:17 PM   #2
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Damn, 87 octane FTW
What does the alcohol do?
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Old 09-04-2008, 12:31 PM   #3
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It burns cleaner than gasoline (lower HC), leans out fuel, and also has a cooling effect (lower NOx). My thought process is to target fuel a little richer than it should be then dump about a quart of alcohol to lean it out and reap the benefits. It may be overkill/unneccessary in some cases but I've had good results doing this method so far. If you do not add alcohol, I would probably target 14.7AFR @ 25MPH and 15.0 @ 15MPH.

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Old 09-04-2008, 01:17 PM   #4
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Interesting. I targeted 14.7:1 and left timing alone. Passed fine with a new cat.

Most people fail because of High NOx due to aging cat. Which can sometimes be remedied by going a little rich and a little hotter exhaust (retard timing).

Last edited by Ben; 09-04-2008 at 01:29 PM.
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