While there's a lot to be said about down-track, WOT tuning and consistency I think the idle/tip-in/acc. pump tuning is very important to consistency. That doesn't necessarily mean that it needs to be perfect or even ideal. There have been occasions when I've been enlisted to do some wideband 02 tuning and the result was traction problems from the newfound power. It's frustrating when things are going in the right direction, ET's dropping and the driver/owner says "no more" just because the car/track can't handle it. Also, no amount of carb tuning can compensate for inconsistent staging or not bringing the exact same car to the starting line each time.