Originally Posted by Thumper SRT6

This is a good point. I'm not sure if it is true or exactly how it works, but supposedly the ECU will apply any Long Term Fuel Trims even when we go WOT. Disconnecting the battery will clear any LTFTs. This would then change your AFR's, which would affect your times.

I don't remember where I read that, but I think it was somewhere here on the forum, or maybe over at mbworld. I haven't actually tried clearing my LTFTs or even datalog that I have any, but after I put on the NW manis in January, it took a couple of weeks before I saw my AFR's lean out while at the track. (I don't drive my car much day-to-day).

Looks like the only way to really know would be to drive the heck out of your car then go back to the track. I feel your pain, bmorgan! These damn cars bug the crap out of me sometimes!