TwinTurbo.NET: Nissan 300ZX forum - The Smogpisacdes, Chapter 5 - The last word
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Subject The Smogpisacdes, Chapter 5 - The last word
     
Posted by moxie (SF) on February 22, 2020 at 6:25 PM
  This message has been viewed 873 times.
     
     
Message So, I took my car to a smog shop in Marin today to try a smog pre-test. After reading a ton, and finally understanding how to set timing on my Z, I decided to see what the car was doing.

I am happy to say, the car looks good, I don't think it will have a problem passing smog! Yay!!!!!!! Now, I did have to pull out a few tricks to get the numbers inline where they should be, mostly being, I retarded the timing a bit as per recommended from a smog shop on how to help older cars pass, and I'm guessing if I could manage to find new cats, I would pass without having to retard the timing at all.

I think what happened: at first, I was off a timing tooth, then I was way too advanced then I tried with my hi-flow cats, and those just aren't very good at reducing emission numbers. It was all self inflicted. Like all good problems.

So, I am feeling much better. Here are the numbers

My initial failed compared to today's run

HC
prev - 15mph - meas 146, max 59 <== fail
today - 15mph - meas 27, max 59 <== pass

prev - 25mph - meas 80, max 34 <== fail
today - 25mph - meas 17, max 34 <== pass

CO
prev - 15mph - meas .34, max .34 <== pass
today - 15mph - meas .07, max .34 <== pass

prev - 25mph - meas .10, max .32 <== pass
today - 25mph - meas .05, max .32 <== pass

NO
prev - 15mph - meas 1167, max 484 <== fail
today - 15mph - meas 93, max 484 <== pass

prev - 25mph - meas 159, max 498 <== pass
today - 25mph - meas 39, max 498 <== pass


IMG-20200222-150315

IMG-20200222-150358

These are interesting in the fact it shows what back to back runs look like in terms of getting the cats hot. It's pretty dramatic. The first run the car had sat for about 15 min before the test started, the 2nd run was only about 2 min of sitting before he ran the test again.

Cats not hot
IMG-20200222-153839

Cats hot
IMG-20200222-153846

WOOOOOOHOOOOOOOO!!! @#%#&@((*&^!#&#

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