@cbaber: I just read this now, but here's a thought for you: Do you have OEM wheel size? I had large prelude tires/wheels on my VX for about 2 weeks waiting for a chance to get winters put on them. This was a whopping 9.7% increase in outside diameter, plus much heavier wheels to boot. The car struggled much more to stay in lean-burn with those wheels on, b/c the gearing was too tall and had to struggle, and the extra reciprocating mass, etc, meant more work too. So this is just a thought: you cant' diverge much from OEM wheel size for gearing's sake.
Also, I just put a warm air intake on my VX, but it's too early to see if it works much yet...haven't had a chance to drive it yet. I'll let you know if it helps much that I can notice as winter is setting in here soon.
@greasemonkey: thank you very much for taking the time to give actual air-fuel ratios while running! Outstanding.
You manged to keep the meter in the exhaust pipe while driving down the road? Did the 22:1 to 23.5:1 ratios hold steady all throughout the lean-burn operation, or was that just the most common averages?
John