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Shift time refers to the time interval between gear
Gear

A gear is a component within a Transmission device that transmits rotational force to another gear or device. A gear is different from a pulley in that a gear is a round wheel that has linkages that mesh with other gear teeth, allowing force to be fully transferred without slippage....
 changes in a transmission
Transmission (mechanics)

Using the principle of mechanical advantage, transmissions provide a speed-torque conversion from a higher speed motor to a slower but more forceful output or vice-versa....
 during which power
Motive power

In thermodynamics, motive power is an agency, as water or steam, used to impart Motion . Generally, motive power is defined as a natural agent, as water, steam, wind, electricity, etc., used to impart motion to machinery; a motor; a mover....
 delivery is interrupted. This is usually in reference to motor vehicles but can apply to any gearbox. Reducing shift time is important in performance vehicles or race cars because it means the vehicle is rolling without power to the wheels. Shift time in a manual
Manual transmission

A manual transmission is a type of Transmission used in automotive applications. It generally utilizes a driver-operated clutch operated by a pedal or lever, for regulating torque transfer from the engine to the transmission, and a gear-shift either operated by hand or by foot ....
 gearbox is dependent on the driver but in automatic
Automatic transmission

An automatic transmission is an automobile gearbox that can change gear ratios automatically as the vehicle moves, freeing the driver from having to shift gears manual transmission....
 or semi-automatic
Semi-automatic transmission

A semi-automatic transmission is a system which uses electronic sensors, processors and actuators to do gear shifts on the command of the driving....
 cars the electronic mechanism must be tuned to minimize the time between gears.

One method of drastically reducing shift time is to use a Direct-Shift Gearbox
Direct-Shift Gearbox

Direct-Shift Gearbox ), or DSG, is a Volkswagen Group developed electronically controlled multiple-shaft twin-clutch gearbox manual gearbox - without a conventional clutch pedal, with full automatic, or semi-manual control....
 which has two independent clutch
Clutch

A clutch is a mechanism for transmitting rotation, which can be engaged and disengaged. Clutches are useful in devices that have two rotating shafts....
es that predict the next gear change making the shift time very small.






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Encyclopedia


Shift time refers to the time interval between gear
Gear

A gear is a component within a Transmission device that transmits rotational force to another gear or device. A gear is different from a pulley in that a gear is a round wheel that has linkages that mesh with other gear teeth, allowing force to be fully transferred without slippage....
 changes in a transmission
Transmission (mechanics)

Using the principle of mechanical advantage, transmissions provide a speed-torque conversion from a higher speed motor to a slower but more forceful output or vice-versa....
 during which power
Motive power

In thermodynamics, motive power is an agency, as water or steam, used to impart Motion . Generally, motive power is defined as a natural agent, as water, steam, wind, electricity, etc., used to impart motion to machinery; a motor; a mover....
 delivery is interrupted. This is usually in reference to motor vehicles but can apply to any gearbox. Reducing shift time is important in performance vehicles or race cars because it means the vehicle is rolling without power to the wheels. Shift time in a manual
Manual transmission

A manual transmission is a type of Transmission used in automotive applications. It generally utilizes a driver-operated clutch operated by a pedal or lever, for regulating torque transfer from the engine to the transmission, and a gear-shift either operated by hand or by foot ....
 gearbox is dependent on the driver but in automatic
Automatic transmission

An automatic transmission is an automobile gearbox that can change gear ratios automatically as the vehicle moves, freeing the driver from having to shift gears manual transmission....
 or semi-automatic
Semi-automatic transmission

A semi-automatic transmission is a system which uses electronic sensors, processors and actuators to do gear shifts on the command of the driving....
 cars the electronic mechanism must be tuned to minimize the time between gears.

One method of drastically reducing shift time is to use a Direct-Shift Gearbox
Direct-Shift Gearbox

Direct-Shift Gearbox ), or DSG, is a Volkswagen Group developed electronically controlled multiple-shaft twin-clutch gearbox manual gearbox - without a conventional clutch pedal, with full automatic, or semi-manual control....
 which has two independent clutch
Clutch

A clutch is a mechanism for transmitting rotation, which can be engaged and disengaged. Clutches are useful in devices that have two rotating shafts....
es that predict the next gear change making the shift time very small. Using a freewheel
Freewheel

In mechanical engineering or automotive engineering, a freewheel or overrunning clutch is a device in a transmission that disengages the driveshaft from the driven shaft when the driven shaft rotates faster than the driveshaft....
 may reduce shift time as it may not be necessary to use the clutch. A shift kit
Shift kit

A Shift kit is an Aftermarket component for automobiles. For manual transmission equipped cars, it is a component that replaces the stock gear selecter ....
 is also intended to reduce the shift time of a manual vehicle.

In a manual transmission
Manual transmission

A manual transmission is a type of Transmission used in automotive applications. It generally utilizes a driver-operated clutch operated by a pedal or lever, for regulating torque transfer from the engine to the transmission, and a gear-shift either operated by hand or by foot ....
 car, shift time for upshifts can be reduced by installing a lighter flywheel
Flywheel

A flywheel is a mechanical device with significant moment of inertia used as a storage device for rotational energy. Flywheels resist changes in their rotational speed, which helps steady the rotation of the shaft when a fluctuating torque is exerted on it by its power source such as a piston-based engine, or when the load placed on it is...
. During an upshift the engine revolutions must fall for the same vehicle speed; lighter flywheel will cause the revolutions to drop faster when the engine is unloaded, leading to shorter shift times.

Shift times

  • A long shift time is considered anything over 625 ms
  • The average manual car driver: 500 ms - 1 s
  • Aston Martin Vanquish: 250 ms
  • Ferrari 575M: 220 ms
  • BMW M3 E36 with SMG I
    BMW M3

    The BMW M3 is a high performance BMW M GmbH version of the popular BMW BMW 3 Series compact car automobile. M3 models have been derived from the E30, E36, E46 and E90/E92/E93 3-series....
    : 220 ms
  • Audi TT
    Audi TT

    The Audi TT is a sports car manufactured by Audi since 1998 in Gyor, Hungary, now in its second generation — and available as a 2+2 coup? or two-seater roadster....
     Quattro 3.2 (Direct Shift
    Direct-Shift Gearbox

    Direct-Shift Gearbox ), or DSG, is a Volkswagen Group developed electronically controlled multiple-shaft twin-clutch gearbox manual gearbox - without a conventional clutch pedal, with full automatic, or semi-manual control....
    ): 200 ms
  • Ferrari 360
    Ferrari 360

    The Ferrari 360 is a mid-engine two-seater sports car produced from late 1999 until 2005. The 360 replaced the Ferrari F355 and was itself replaced by the fairly similar Ferrari F430....
    : 150 ms
  • Enzo Ferrari
    Enzo Ferrari (car)

    The Enzo Ferrari is a V12 engine Rear mid-engine, rear-wheel drive layout berlinetta named after the company's founder, Enzo Ferrari. It is currently one of the list of automotive superlatives Naturally-aspirated engine production cars in the world ....
    : 150 ms
  • Ferrari FXX
    Ferrari FXX

    The Ferrari FXX is a race car developed as part of an unusual development program by automobile manufacturer Ferrari in Maranello, Italy. Production of the FXX began in 2005....
    : Under 100 ms
  • BMW M3 E46 with SMG II
    BMW M3

    The BMW M3 is a high performance BMW M GmbH version of the popular BMW BMW 3 Series compact car automobile. M3 models have been derived from the E30, E36, E46 and E90/E92/E93 3-series....
    : 80 ms
  • Ferrari 430 Scuderia & FXX Evoluzione: 60 ms
  • Volkswagen Golf
    Volkswagen Golf

    The 'Volkswagen Golf' is a compact car / small family car manufactured by Volkswagen since 1974 and marketed worldwide across six generations, in various body configurations and under various nameplates -- prominently as the 'Volkswagen Rabbit' in the United States and Canada , and as the 'Volkswagen Caribe' in Mexico ....
     GTI (Direct Shift
    Direct-Shift Gearbox

    Direct-Shift Gearbox ), or DSG, is a Volkswagen Group developed electronically controlled multiple-shaft twin-clutch gearbox manual gearbox - without a conventional clutch pedal, with full automatic, or semi-manual control....
    ): 8 ms
  • Bugatti Veyron
    Bugatti Veyron

    The Bugatti Veyron EB 16.4 is a mid-engine design Grand tourer car produced by Volkswagen Group subsidiary Bugatti Automobiles SAS and was introduced in 2005 as the fastest production car in the world....
     (Direct Shift
    Direct-Shift Gearbox

    Direct-Shift Gearbox ), or DSG, is a Volkswagen Group developed electronically controlled multiple-shaft twin-clutch gearbox manual gearbox - without a conventional clutch pedal, with full automatic, or semi-manual control....
    ): 8 ms


See also

  • Powershifting
    Powershifting

    Powershifting is a method of shifting used with manual transmissions to reduce the time where the driving wheels are not powered.Unlike a normal gearchange with a manual transmission, in a powershift, the driver does not let off the accelerator....