Topic: 22RE smog & NOx....

[emsvitil]

I have a smog test due (86 22RE) and looking at the results of my previous smog test plus digging thru the board of past posts and this post today:

http://board.marlincrawler.com/index.php?topic=35317.0

makes me believe that 22REs have a problem with NOx.


I have 2 theories (I believe it's a combo of the 2...)

1.  Carbon buildup raising compression ratio and combustion temperature
2.  Better replacement exhaust system.

I'll explain #2.   The stock EGR system's EGR modulator takes into consideration exhaust backpressure for how much exhaust to route back through the system (remember EGR will lower NOx).   

With a better more freeflowing exhaust, you'll have less backpressure and then less EGR, then more NOx......



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