>>28664013
just shortening the gears isn't necessarily the best for acceleration actually
you want to optimize the length of the gears so that as soon as you accelerate and every time you shift you are at or near peak torque
for the s13, that's exactly 5000 rpm. so line your first gear up with whatever ratio will sit at exactly 5k during the race start sequence. then when you shift up, 2nd should land at about 5k too. if you're simply shortening the ratios by increasing final drive you end up having to shift more which deletes any gains in acceleration. furthermore, revving the piss out of the engine and shifting at redline won't get you anywhere, especially for some of the smaller cars. you have to stay in the actual powerband, below the redline.

built an alto for the pizza wanderer and the kei cars in particular are not into being revved high and will just refuse to accelerate at all. shifting sooner,and letting the low rpm torque do its thing makes for much faster acceleration for a lot of the cars.