What does the overdrive button do? - Nissan Forums : Nissan Forum
 
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#1 Old 01-10-2009, 07:01 PM
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What does the overdrive button do?

I have an automatic 98 200sx and noticed that on the shifter there is a button that when i press it a light in the dash comes on saying O/D Off. What is it for and when should it be used? Thanks
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#2 Old 01-10-2009, 07:04 PM
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overdrive allows the car to shift into the final gear. it should definitely be on while driving on the freeway. (most?) people keep overdrive on all the time, and maybe turn it off when climbing a hill at higher speeds.


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#3 Old 01-11-2009, 08:34 PM
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Quote:
Originally Posted by phreekee25 View Post
overdrive allows the car to shift into the final gear. it should definitely be on while driving on the freeway. (most?) people keep overdrive on all the time, and maybe turn it off when climbing a hill at higher speeds.
I believe that is correct,the owner manual should tell you exactly when to and not to use the OD.

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#4 Old 01-11-2009, 08:37 PM
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This shoudl help more...

Quote:
Generally speaking, overdrive (OD) is the highest gear in the transmission. Most automatic transmissions have three speeds and overdrive (fourth speed). Overdrive allows the engine to operate at a lower rpm for a given road speed. This allows the vehicle to achieve better fuel efficiency, and often quieter operation on the highway. When it is switched on, the transmission can shift into overdrive mode after a certain speed is reached (usually 70+ km/h [43+ mph] depending on the load). When it is off, the transmission shifting is limited to the lower gears. For normal driving conditions, operation of the overdrive should be enabled only if the average speed is above 70 km/h (approx. 43 MPH).

It may be necessary to switch it off if the vehicle is being operated in a mountainous area.

The automatic transmission automatically shifts from OD to third gear when more load is present. When less load is present, it shifts back to OD. Under certain conditions, for example driving uphill, or towing a trailer, the transmission may "hunt" between OD and the third gear, shifting back and forth. In this case, switching it off can help the transmission to 'decide'. It may also be advantageous to switch it off if engine braking is desired, for example when driving downhill. The vehicle's owner's manual will often contain information and suitable procedures regarding such situations, for each given vehicle.

Overdrive was widely used in automobiles with manual transmission particularly in Europe (see below) and was commonly available on either top gear alone, or on top gear and the gear immediately below (eg third gear and fourth gear. In this case gear changing is still possible in all gears, even with overdrive disconnected. Overdrive simply adds effective ranges to the gears, thus overdrive third and fourth become in effect "third-and-a-half" and a fifth gear. In practice this can lead to an overlap of gears in the third/fourth and overdrive-third/overdrive-fourth ranges, providing greater flexibility particularly in performance cars.

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#5 Old 01-17-2009, 02:31 AM
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^ Great info, I've always wondered that... Kinda of the effect of the cold weather, not lower the rpms too...



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