[QUOTE=jbhowat]First of all, you didn't acclimate in 4 days. Maybe enough so that you don't notice a difference under normal circumstances, but even if you were riding hard all 4 days - on day 5 you would be no where near full acclimation. It takes a couple of weeks of excercising to be acclimated to altitude, add to the fact that for most of that pass you were probably at 8-9k feet, where even I (acclimated to 4,800ft in Fort Collins) would notice a small difference I'm sure the heat was the issue.
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I am thinking that he meant he finished acclimating 4 days prior to the climb, not that that is when he started. Ur Int3rpr3tation is t3h suck. PWNED!!!111!