re: Ford Endeavour facelift launch in early 2019. EDIT: Spotted in India Quote:
Originally Posted by vaasscit Ford Endeavour is a five-door SUV variant of the Ford Ranger four-door pickup truck. |
Exactly. It's an SUV and not a pickup truck. Quote:
Top Speed of the vehicle is determined by the gear ratio of the highest gear and not the number of gears.
Acceleration is determined by torque @ wheel (Gear ratio) : first gear can be shorter for better off-the-line acceleration and the number of gears again play no role here.
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One of the best example I can provide you, about having more gears and higher top speed is Aston Martin Vanquish. It switched from a 6-speed to an 8-speed ZF Transmission with the same engine. Not only did the 0-60mph time drop from 4.1s to 3.6, but it achieved a higher top speed of 201mph compared to the previous one of 186mph.
Of course number of gears play a role! If you have more gears to choose from, you have shorter ratios for not just the first gear so you have more to choose from. So instead of let's say 2nd gear topping out at 90mph, we can have it top out at 75mph. Wheel torque will be higher for 75mph since we have more aggressive ratios and it will improve acceleration.
As for achieving higher top speed, it was previously limited due to having only 6-gears as the top speed was limited to the top speed 6th gear. In a sense you are correct. More gears =/= top speed directly. They could have achieved 201mph in 6-gears as well. However, that is too aggressive for a car that you will be driving on the highway. Now you add 7th and 8th gear to the car. It enabled Aston Martin to add higher gear ratios to those enabling it to reach 201mph as fast as possible by having more aggressive gears. Quote:
Transmission with more gears allows for a greater ratio spread between them meaning the engine has more options for optimal operation. However the more gears you have, the more complex the architecture of the transmission becomes and you get more friction losses and, as a result, you lose the efficiency.
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Having 10-gears, chances are while driving at a set speed, your RPM's will be low. General rule, lower RPM means better fuel efficiency and lower frictional loss. Of course, accelerating in higher gears is not efficient. However, since it has more gears, it has better chances of finding an efficient engine speed for a wheel speed. Quote:
For this additional clutch required for an 10-speed (compared to 9-speed) would have created more internal drag than the added gear span could offer.
Source : Professional experience of 8 years in Automobile Transmission - R&D
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I'd rather trust reliable sources. https://autos.winnipegfreepress.com/...automatic.html
Maybe this will help. It also explains how Ford's 10-speed provides better acceleration and better fuel efficiency.
Last edited by GTO : 3rd May 2018 at 10:35.
Reason: Language errors
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