Sorry didn't see that post in the other forum. Also with a tweecer don't risk blowing up your car with incorrect paremeteres? Also wouldn't a tweecer be a calibrator not a true fix since it Doesn't flash the pcm? Why would you need to make on the fly adjustments? Of course there will be difference in air density and such but why would you want to do that when your on a open track event. I can see on the mulitiple postion setting for street driving and such. You mention datalogging wouldn't you want to dyno it to get a true tune anyway so couldn't you have a obd2 prog to monitor the whats going on? With the tweecer does that let the computer alter the tables on the fly? Not being rude just valid questions. I have also been told the tweecer does not switch other calibrations that need to be changed once another adjustment has been made.