but here goes, with the help of excel.
Let's say we do a third gear pull from 2000 up to 6500 rpm at WOT.
by using a trend line, and putting the equation on the graph, it actually give you the rpm/s. (Rev per min / seconds) which is actually a radial acceleration.
so if with the same conditions: -exact same road incline, same temp/humidity same weight of the car.
if your new tune is better it should give you a sligtly better rpm/s slope.
what I was wondering is could there be a new window in Nistune that included this equation base on a portion of a datalog. so the let's you got 350rpm/s with tune 1 and you make modfication you get 400rpm/s with tune 2
and you coudl put marker from let's say x sec (2000 rpm start point) to y sec( 6500rpm) and then give the resulting slope.
I know I've seen back in the days how to actually calculate the linear regresion equation of a known function however I'm not too sure how Excel does it
just a thought!
it would give a tangible number somewhat like a dyno, though less accurate