when to shift to over drive?

**Ungas** · November 25th, 2003 09:37 AM

Whether OD on or off, mas magandang ilagay ang shifter sa 2 and let the engine braking help you descend slowly with ample brake applications when needed.

**ClemO** · November 25th, 2003 10:53 AM

This is what I've learned: Gear ratios of the manual trans and auto trannys are different. Manual trannies have closer-spaced ratios usually and are typically 5-speed, with the 5th as an overdrive. The modern automatics feature 4 'forward' gear ratios - with the 3rd gear having a 1.00 ratio, and the 4th as an 'overddrive', usually about 0.71 ratio. I'ts used primarily to drop the engine rpm closer to its maximum torque rpm at high speeds, to reduce fuel consumption. The O/D 'off' switch is used when the tranny ECU isn't 'smart' enough to decide to keep it on 3rd or overdrive (hunting) - usually when travelling on roads with a mild incline/decline. Some new tranny control units claim to be intelligent enough to stop shifting to overdrive after a few times; yung iba hindi. Basically you decide - if it seems to be hunting a lot, turn the overdrive off.

**ClemO** · November 25th, 2003 10:59 AM

Oops - regarding the orig question - generally same, if it seems that the trans ecu hunts up and down gear ratios (which will happen when climbing hills - i.e. entering a curve climbing up, you let go of the gas pedal to slow down, and the tranny decides to shift to the next gear!), use 2 or L to limit the shifting. When in 'D', you dont get any engine-braking as the tranny uncouples itself when you let go fo the gas pedal, forcing you to use the brakes to slow the vehicle. Putting the tranny in 2 or L keeps the tranny coupled even when you let go of the gas pedal (until a certain minimum rpm or when you step on the brakes) so that you get a measure of engine braking power.

**Jeepcruizerph** · November 25th, 2003 11:37 AM

maraming salamat po Sir Ungas and ClemO :D

**turk182** · November 25th, 2003 05:23 PM

yep... so up lion's head, it's advisable to use 2 or even 1 (L) if you're vehicle is loaded... most of the time up and down Kennon or Marcos H-way, D w/o O/D or at most 2 will be enough...

i sometimes turn off O/D when overtaking at the expressways depending on the situation...

**5Speed** · November 25th, 2003 05:50 PM

hmmm very enlightening, minsan pa lang kasi ako gumamit nang AT na sasakyan, and I was a new driver way back then, parang boring that's why I prefer the manual tranny.... but now if I am going to buy a new car I will get an AT, parang nakakapagod nang mag drive especially pag traffic....

way back then, I just put the tranny to D whether its going up or going down...hehehehe pudpod kagad ang brake lining, madalas nga eh nangagamoy na....hehehe sabi ko tuloy pambihirang kotse to di marunong mag-engine brake...hehehehe

la lang....

**krscla** · November 25th, 2003 11:28 PM

Ok din gamitin ang O/D kapag umoovertake ka. :D

**boybi** · November 26th, 2003 12:03 AM

when overtaking at highspeeds and feeling ko mabibitin ako, like kung meron akong kasalubong, or ayaw magbigay nung inovertakan ko, i switch off the O/D para magdownshift.

**mbt** · November 26th, 2003 10:12 PM

usually, hindi na kailangan i-off yung O/D when overtaking since mashing the go pedal will result in an instantaneous one- or even two-gear downshift on good autos

**OTEP** · November 26th, 2003 10:20 PM

May kickdown nga iyon as what mbt has said. Just mash the go-pedal and andiyan na siya. From the Lacson stoplight to the UST main gate, 100+ kph na ang takbo ng CR-V ng classmate ko when she asked me to 'park' it. :D

Sa Benz, there is built-in resistance before you go into the kickdown zone. On older models, there is literally a switch on the floor which you will hit when you put the pedal to the metal.