Sunday, January 26, 2014

How effect auto and manual gear system to differential separately.?

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It is a Van.


Answer
Manually controlled automatic transmissions

Most automatic transmissions offer the driver a certain amount of manual control over the transmission's shifts (beyond the obvious selection of forward, reverse, or neutral). Those controls take several forms:

Throttle kickdown
Most automatic transmissions include some means of forcing a downshift into the lowest possible gear ratio if the throttle pedal is fully depressed. In many older designs, kickdown is accomplished by mechanically actuating a valve inside the transmission. Most modern designs use a solenoid-operated valve that is triggered by a switch on the throttle linkage or by the engine control unit (ECU) in response to an abrupt increase in engine power.
Mode selection
Allows the driver to choose between preset shifting programs. For example, Economy mode saves fuel by upshifting at lower engine speeds, while Sport mode (aka "Power" or "Performance") delays upshifting for maximum acceleration. Some transmission units also have Winter mode, where higher gear ratios are chosen to keep revs as low as possible while on slippery surfaces. The modes also change how the computer responds to throttle input.
Low gear ranges
Conventionally, automatic transmissions have selector positions that allow the driver to limit the maximum ratio that the transmission may engage. On older transmissions, this was accomplished by a mechanical lockout in the transmission valve body preventing an upshift until the lockout was disengaged; on computer-controlled transmissions, the same effect is accomplished by firmware. The transmission can still upshift and downshift automatically between the remaining ratios: for example, in the 3 range, a transmission could shift from first to second to third, but not into fourth or higher ratios. Some transmissions will still upshift automatically into the higher ratio if the engine reaches its maximum permissible speed in the selected range[citation needed].
Manual controls
Some transmissions have a mode in which the driver has full control of ratio changes (either by moving the selector, or through the use of buttons or paddles), completely overriding the automated function of the hydraulic controller. Such control is particularly useful in cornering, to avoid unwanted upshifts or downshifts that could compromise the vehicle's balance or traction. "Manumatic" shifters, first popularized by Porsche in the 1990s under the trade name Tiptronic, have become a popular option on sports cars and other performance vehicles. With the near-universal prevalence of electronically controlled transmissions, they are comparatively simple and inexpensive, requiring only software changes, and the provision of the actual manual controls for the driver. The amount of true manual control provided is highly variable: some systems will override the driver's selections under certain conditions, generally in the interest of preventing engine damage. Since these gearboxes also have a throttle kickdown switch, it is impossible to fully exploit the engine power at low to medium engine speeds,

What is a good cheap sports car?




Jake Marti


I'm looking for my first car, I want it to be a sports car, but a lot of them are expensive. I'm want to buy from the owner only so i don't have to worry about paying off anyone. Looking somewhere between 1500-6000 and any year just can't go below 91. I'm not to good with cars, but I'm trying to learn, I also need one that won't break down, I've heard Mitsubishi's break down a lot so idk... help me out here thanks (:


Answer
Oklatom:

The adage goes: "Good, cheap, or fast. Pick two." So you can have good and cheap, but it won't be fast. Yeah, the OP says he is looking for a sports car, but not all sportscars are fast.

Look for an early-to-mid 1990s Miata or Toyota MR2. Those tend to be pretty reliable cars, and the ones at the upper end of the scale will have been kept by owners who use them only on the weekends and take good care of the car.

You could also consider a 1990s Mustang or Camaro with the V6 engine. They may be beat up inside, and you might have to undo some crappy stereo wiring, but that would be good experience learning to wrench on a car.




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