Quote Originally Posted by grumpy rooster View Post
If the idea is to achieve the best possible 1/4 mile times then you really need to work back from what rpm your peak power is and hence what rpm you want to cross the finish line at. Then what gear you want (ie 4th or 5th) and then look at tyre size. Once you know all of that then you can look at gearbox ratios and final drive ratio.

There's no point going for a combination that lands you halfway through a gear over the line nowhere near peak power. Your just losing time. Its the total combination, not just a bunch of ratios. One combo is not best for all situations.
Quote Originally Posted by Hyper_Performance View Post
Yup, absolutely spot on. The best situation is to usually hit your ET right at the end of 4th Gear, so you would want to change your gearing to suit this. Of course, what gearing you go for though all depends on your setup.

This is the main advantage of using a B-Series tranny over an H or K i.e Gearing Options
I do agree, however that doesnt really apply for street applications where the first 3 gears are for accelerating, while 4th and 5th are used for cruising.