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Smog test math on upgrades and Gas powered

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  Is there a way to look at smog test results and figure out what an "up grade" would do to a smog test?  Like injectors for example, anyway using math to  "guessimate" what a new smog test would be?   I would hate to buy some upgrade stuff and then fail smog test.  The state (WA) I'm in uses the "transparity" test I'm told.

 

Also found out my truck has been licensed as "gasoline powered" for long time.  Maybe that's the reason several smog tests ago, the guy looking at his smog machine said to bring RPM's up to 3,000.  Believe it or not,  the license people can't change the title back to diesel by looking at VIN or lifting hood and seeing the big words across the valve cover.   I have to go down to state patrol and they have to "verify".  And I might have to even get an appointment for state patrol look at it.  Calling tomorrow. What a hassle.  Wife saves way to much.  Found second smog test we got in 2008 and it shows "Diesel powered" on title.  How it got changed to "gas powered"  I have no idea.  

 

Thanks

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  • jlbayes
    jlbayes

    Your best bet would be to find someone with similar modifications as to what you are wanting. There is no way to be certain how your truck is going to react to all modifications. Too many factors invo

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Your best bet would be to find someone with similar modifications as to what you are wanting. There is no way to be certain how your truck is going to react to all modifications. Too many factors involved including the nut behind the wheel.

    • Like 1
    • Haha 1

    And it depends greatly on the tuning in place.  

     

    My truck would fail smog if I just ran stock tuning and my 7 x .009's   My altitude make my truck pretty smokey on stock tuning.  

     

    What does the test actually consist of?  

    • Author

    Op here...

    Thanks for replies...

    My terminology was wrong.  The test in WA state ( and only some zip codes) is what is called "Opacity" test.  

     

    Washington’s Diesel Engine Standards Model year Opacity limit

    1991 and earlier 50%

    1992 – 1996 40%

    1997 – 2008 30%

     

    Data from "Emission Check Handbook for Authorized Emission Specialists and Authorized Repair Facilities"

    available on the Department of Ecology’s website at

     

    https://fortress.wa.gov/ecy/publications/SummaryPages/95210.html

     

     

     

    look sliek you are subject to a similar test as I am. 

     

    Here;s my thread covering what was done.

     

     

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