I wonder how much can be said about a line.
I run a Pro10 (1/10th pan) road course (SoCal) with MarkA who pretty much cleans us up with every race.
It's not the cars - they are all pretty much exactly the same.
It's not the tires - we all use the same tires.
It's not the sauce - again, all the same
It's not the motors - he uses the CHEAPEST, CRAPPIEST motors
It's not the batteries - again, CHEAP, CRAPPY. . .well, not anymore - He's getting great SMC's - but I'm getting the same cells. . .
It's all, all, all line. After the race we all go out to eat and he will explain what he did, what we didn't do (he tends to come up behind 2nd place and just run there until the race is over. . .just watching. . .)
We (try to) find the line that will carry the most speed, the line that allows us to drop speed entering so we can grab throttle as early as possible so we can exit with as much speed as possible.
I do realize that setups are vitally important. No toe stepping here. Just bringing in the line again.
But, when I run my TC-3 and NTC-3 and apply the line (with obvious modifications for the car) I find that I go a lot faster.
Too bad it's not fast enough to actually WIN anything. . .