No concept of torque multiplication through gearing (transmission gear ratios, final drive ratio, tire diameter)??? No concept of the difference between torque and horsepower?? No worries.
The torque from the engine has absolutely no bearing on anything regarding speed/acceleration. You do not shift with regards to torque when driving for maximum acceleration. It's the power to the wheels that matter. Torque is simply the ability to do work. Power is the RATE at which work can be done.
For one example, lets say I wanted to lift a very heavy object. I would use a pulley system (example of work/torque multiplication). Since I do not have enough muscle strength, I use a pulley system to increase the work I can do at the expense of speed/distance. I can now lift the heavy object, just not very far very fast. This is a good example of first gear, it has the greatest torque multiplication of all the gears.
Another good car example are the 99-04 mustang GT's that have 320 ft-lbs of torque but only 260hp. It's ideal for your typical american fatass. It can haul your fat ass around with ease, it's just not going to do it as fast as a car with a better hp:lbs ratio.. (like the 350z).
This is why 1/4 ET calculators don't ask you for torque, because torque from the engine has no bearing on acceleration whatsoever. It's not the amount of work that can be done that matters, it's the RATE at which work can be done that matters. That's why it's all about power:weight ratios and torque multiplication through proper gearing!!!
Could you imagine shifting an F1 style car (18,000 rpm redline) for peak TORQUE! LOL. Considering hp and torque intersect at 5252rpm, peak power is around 900hp and peak torque is less than 290 ft.lbs, YOU WOULD GET SERIOUSLY OWNED!!! That's an understatement to say the least.
Thankfully the 350z is geared beautifully from the factory. It's a great compromise between acceleration, fuel economy, and engine longevity. The stock final drive is 3.538. At 6600rpm in 6th gear you would be travelling at 185mph. The stock engine(287hp) only has enough power to get us up to about 170mph(drag limited). The stock tires are only rated for 168. The ECU limits speed to 155 (159 on the speedos). With 4.11 gearing, the Z would have a top speed of 159(actual), which is still higher than the speed limiter, and the acceleration would be significantly faster. So why didn't they gear the car this way, since after all it would accelerate faster and have less top speed so they could forget about the limiter? Simple. Fuel economy would be worse and wear and tear on the engine would increase (more revolutions on the engine per mile). That is no good from a manufacturing/engineering/financial/business standpoint.
Anyway, that's obviously not everything, but hopefully I have shed some light on this big dark secret.
Bottom line: Shift the Z at redline or own yourself.