Quote:
Originally Posted by cRiPpLe_rOoStEr
Depending on how wide is the gap between 2 random gears, there is virtually no advantage in getting a bigger amount of gears. Automakers are doing so because of some folks who buy a manual because it's either cheaper or the only option available for a certain model, but are too lazy to downshift when required  |
Absolutely wrong. The increase in the number of gear ratios over time is due to the manufacturers chasing fuel economy (and possibly emissions).
Extra ratios cost real money. They also add weight - more than just the extra ratios would suggest because longer gear shafts deflect more so have to be made stronger or supported better - and some friction. For them to be specified there must be a tangible benefit.
As I posted the ideal is an infinite number of ratios so the engine can be held at the optimum load and rpm for a particular power demand. Pick any power demand. There is one engine load and engine speed at which that power is achieved most efficiently. That is where you want to be operating that engine. If there are a finite number of discrete gear ratios you will be somewhere away from that engine load and speed for most of the time the engine is generating that power output.
With too many ratios it is possible to spend so much time shifting that there isn't enough driving time remaining to justify them. That is ameliorated with the robotic shifting also more common in recent years.