I am driving an auto transmission car. But I am not sure of the controls. There is a small button on the handle when pressed "A/D OFF" is displayed on the screen. Nearly for all practical purposes I put into D and drive. But when should I use the other functions. Suppose I am overtaking and need more torque how do I make it manual?
2007-03-11 04:46:51 · 7 answers · asked by PETER 3 in Cars & Transportation ➔ Maintenance & Repairs
The Overdrive button that is. What it does is cancel the highest gear for you.
Now, most make the mistake of leading overdrive on, during city traffic...supposedly they perceive that it's "fuel savings" gear". Really, what it does is it makes the transmission shift more often. Just imagine, in normal city traffic you accelerate from a light and with O/D on, it's upshifting earlier because the transmission is programmed to be in a "relaxed" mode.
Overdrive should only be turned on when driving 55MPH+, sort of in the highway. Owners manuals also state this. I've seen a high rate of failed transmission from people who constantly have left it on the O/D on position, then I must here "Oh I hate -----, they were so unreliable to me" and I'm here looking at them "poor transmission you -------".
But yes to answer your next question, if your in a situation where you need more oomph, remove turn the O/D off. What happens is that it allows the transmission to hold the gear, and not shift as earlier as it would have with O/D on.
Hope this helps...
2007-03-11 04:58:25 · answer #1 · answered by A A 3 · 0⤊ 0⤋
O/D is overdrive. this means that your final drive gear ratio in the transmission is in a higher ratio,ie; less input revs than output revs. This lowers the R.P.M. of the engine, allowing for increased fuel economy. Now, using the O/D feature during high load conditions such as city driving,or towing increases strain upon the engine, and transmission leading to early failure, usually of the transmission. So, in high load conditions, use only the non O/D mode, and you should enjoy 'extra' trouble-free miles from your vehicle. some vehicles do not have the 'button' they have a 'D', and a 'D' with a circle around it, the 'D' with a circle is the O/D mode, while the plain 'D' is non-overdrive. In addition, always remember to have the transmission serviced regularly in order to help extend the service life of your transmission. Hope this helps, good luck!
2007-03-11 05:26:50 · answer #2 · answered by Burts chevy 3 · 0⤊ 0⤋
If you want to overtake you use kick down. You put your foot to the floor and your Automatic gearbox will change down and give you added acceleration. Not all Automatic gearboxes have overdrive. Overdrive increases the gear ratios slightly and makes your car more economical on long, high speed runs. If you leave it in overdrive all the time it will not slow you down as quickly in city traffic because the gear ratios are higher.
2007-03-11 04:57:25 · answer #3 · answered by Tony A 6 · 0⤊ 0⤋
If you live in flat country (no hills) you never need to use it. D and drive - when you need to pass - floor the accelerator - and the transmission should "kick down" to the proper gear for most power.
if you are in slow traffic (up to 40 mph say) up and down - turn the O/D off. The transmission will shift fewer times. if you are descending a hill - you also may turn the O/D off to gat some engine braking - thereby saving wear on your brakes. if you are climbing a hill in traffic and the O/D keeps shifting up/down - turn it off. Saves wear on the trans.
Check your owmer's manual if you have one.
2007-03-11 05:08:04 · answer #4 · answered by Thomas E 6 · 0⤊ 0⤋
In most cases, O/D is not used until you reach highway speed. At that speed, you can overtake another car just by putting your foot to the floor. the only time you should turn it OFF is in bad weather conditions other than that, ON will save fuel.
2007-03-11 05:05:17 · answer #5 · answered by Lab 7 · 0⤊ 0⤋
handbook, is low priced, yet you're with the flexibility to bypass speedier computerized, swap gears by way of itself, greater costly, particularly much less speedier because of the fact the RPMS bypass as much as approximately 3 or 4000 and quit. On a handbook you may enable the RPMS to bypass as much as approximately 5 or 6000, dont blow the engine, you may appear as if a moron, yet besides bypass with computerized that's greater good and is greater effective besides...... good success, have exciting, and god bless ya
2016-10-01 22:44:22 · answer #6 · answered by ? 4 · 0⤊ 0⤋
it is not A/D .it is O/D.
meaning OverDrive.
the bottom in the stickshift ,turn it on and off.
2007-03-11 04:53:18 · answer #7 · answered by Anonymous · 0⤊ 0⤋