[Bob Mulry]

Just remember that the only things turning engine RPM (more or less) is the driveshaft, companion flange and pinion gear.

Anything that turns engine speed has to be deaccelerated and accelerated numinous times depending on how many forward gears you have, which will result in a much greater benifit

If your finish line RPM is 8500 and you use a 5.86 rear gear everything to the rear of the pinion gear is turning 1450 RPM.

Whatever your tach says just divide by 5.86 to get rotational speeds all the way down the track and best of all it only has to be accelerated once.

Might be very hard to establish a base line.

Just my 2 cents and something to think about.