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8-speed auto-shift manual w/od.8-Speed Automatic Transmission
Contents move to sidebar hide. Article Talk. Read Edit View history. More Read Edit View history. Type of multi-speed motor vehicle transmission system. This article uses bare URLs , which are uninformative and vulnerable to link rot. Please consider converting them to full citations to ensure the article remains verifiable and maintains a consistent citation style. Several templates and tools are available to assist in formatting, such as Reflinks documentation , reFill documentation and Citation bot documentation.
May Learn how and when to remove this template message. ISBN Retrieved 26 July Retrieved 1 August Archived from the original on Retrieved PH Explains". Archived from the original on 5 August Retrieved 2 August Car and Driver. January 1, Illustrerad Motor Sport in Swedish.
Lerum, Sweden. Life Magazine 4 October : Illustrated Ferrari Buyer's Guide 4 ed. Retrieved 29 July Automotive News Europe. Retrieved 12 June Magneti Marelli. Retrieved 26 March Archived from the original on 13 August Retrieved 30 July Archived from the original PDF on 1 April Retrieved 21 July Retrieved 31 July BMW M Registry.
BMW AG. Retrieved 14 July Archived from the original on 27 July Retrieved 18 July Part of the Automobile series. Automatic transmission Chain drive Direct-drive Clutch Constant-velocity joint Continuously variable transmission Coupling Differential Direct-shift gearbox Drive shaft Dual-clutch transmission Drive wheel Automated manual transmission Electrorheological clutch Epicyclic gearing Fluid coupling Friction drive Gearshift Giubo Hotchkiss drive Limited-slip differential Locking differential Manual transmission Manumatic Parking pawl Park-by-wire Preselector gearbox Semi-automatic transmission Shift-by-wire Torque converter Transaxle Transmission control unit Universal joint.
Written by FE Knowledge Desk. Updated: December 3, pm. Follow Us. What is Automated Manual Transmission? Also Read. What is Anti-Lock Braking System? Follow us on facebook twitter instagram telegram.
Latest News. Some drivers prefer to leave overdrive off when they are driving on surface streets. This is because overdrive can cycle on and off if you need to change speeds continually or if you encounter hilly terrain. They will switch overdrive on when they are on the freeway. But most drivers tend to leave overdrive engaged all the time, unless the torque converter locks and unlocks repeatedly.
You can tell because the car will surge randomly when your car meets a bit of resistance. Certainly, if you are travelling consistently at highway speeds, you should make sure overdrive is engaged. Otherwise, your engine will experience unnecessary stress, rev higher than it should, and use more fuel.
If, on the other hand, you are driving at slower speeds around town — especially if you need to change speeds frequently — you might consider switching off your overdrive. Likewise, if you encounter hill country, you should disengage the feature, since the torque converter will lock and unlock repeatedly as it tries to match the right amount of engine power to the road conditions. Another instance where overdrive is unhelpful and should be switched off is when you are towing, especially something heavy.
When the torque converter locks and unlocks repeatedly under a heavy load, it tends to overheat. And excessive heat is the enemy of your transmission. Actually, overheating of the transmission or the engine can cost thousands of dollars worth of catastrophic damage. You might get away with overdrive if you pull a light trailer, but to be on the safe side, turn it off. If you want your car to last K miles or more , it is better to drive in third or fourth gear at a higher engine speed than to burn up your transmission.
Overdrive was common for many years as a solution for automatic and manual transmissions that had only three or four gears. Third gear might get you up to speed, but once you were driving seventy miles per hour, the engine would sing along loudly and use a lot of fuel. With the addition of overdrive, the transmission could relax and let the engine slow down.
Advances in technology have made traditional overdrive unnecessary. Not only do front-wheel-drive vehicles rely on a different system of gearing, but transmissions with a higher gear count have left overdrive behind. Now, the higher gears are engineered to alter the input to output ratio of the transmission, and because there are more gears, there is a higher likelihood that there is an appropriate gearing for every speed. Still, the idea is the same.
As with overdrive, the goal is to allow the engine to run at a slower speed when your car is travelling at a high speed. That way, your engine does less work and uses less fuel. Every transmission operates in a way that maximizes engine efficiency at high speeds.
That is even true of Continuously Variable Transmissions CVTs that have no gears at all but rely instead on two variable-width pulleys, one on the engine side and the other on the drive side, connected by a flexible belt. A CVT is designed to elicit maximum power from an engine while providing an infinite range of output ratios for any travel speed.
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