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Email a Friend	Article: Dirty Stuff - Part 5
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Message:	I found this article at autospeed.com and thought you might be interested in reading it: 'Dirty Stuff - Part 5' - The emissions changes from simple tuning alterations. It's easy to look at the results of emissions testing and not be able to see the wood for the trees. Some gases go up, others go down. To be even more specific, in some points of the drive cycle, some gases increase by larger amounts than others. So what's it all mean? Which gases increase when the air/fuel ratio is made richer? Which gases decrease when the ignition timing is retarded? We decided to make some broad-brush tuning changes, running a car through the full I/M 240 drive cycle dyno test after each change was made. You can read the article at: http://www.autospeed.com/A_0653/cms/article.html