Weather stations

[pbp1]

Originally Posted by Jim Kaekel

I don't mean to intrude, but I imagine that he's referring to the fact that if you run your car on the "rich" side, that you would tend to pick up a bit more in very good conditions and fall-off a bit more when the air is real bad. On the other hand, if you run on the "lean" side, your car won't vary as much.

I completely agree with your first sentence, but if you run on the lean side of the ideal A/F ratio for your engine, you can have the same un-predictability in performance. As a matter of fact, it can even go the wrong way. I had a customer call me about a tuning issue, his complaint was that when he got in good air, his car actually slowed down instead of picking up. I asked him what his target A/F ratio was, he said 13.8:1, because "thats what everyone who is fast runs at".