You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!
Just curious abt the overdrive button on the auto xb shifter. I turned it off today and doing 60 on the highway my engine was workin harder and it was loud. I figured it couldnt be more efficient so i turned it back on. Any one know about what exactly it does and what having it on and off does for mpg?
O/D is your fuel saver. It should only be used for highway driving. I would recomend turning it off for city driving just because having it on puts more wear on the trans but thats just for city driving.
Scion Evolution : Wisconsin
Even presidents get stoned. Mount Rushmore South Dakota
08 xD (Magnetic Gray) Rally and show.
94 Subaru Impreza L Rally
O/D on allows the automatic transmission to shift into 4th gear. O/D off prevents the automatic transmission from shifting into 4th, making 3rd your highest gear. If you notice the automatic transmission shifting rapidly back and forth between 3rd and 4th (as it may on some hills), turn O/D off until you're off the hill. It'll save wear and tear on the tranny (and your sanity).
Unless you need a bit of engine braking or want to keep the AT from playing ping-pong with 3rd and 4th gears, keep O/D on.
The AT won't shift into 4th if the coolant is too cold (i.e., when the blue coolant light is on).
I use the button only rarely. It is just a convience of pushing a button rather than moving the shifter. I actually like the button more than moving the shifter. I only use it for climbing passes or I found I can get it to shift out of 3rd and back into high as I approach the top of the mountain pass by pushing the on/off switch which must trick the computer and will have it shift into high. I love that about the transmission.
Anything over 40 and I want it shifting into high so if I am going to be doing that for even a short bit I want it up in lockup.
Turning O/D off will decrease your MPG quite a bit and will make your engine work harder. Also, at highway speeds (60-80MPH) the engine will be reving really high. Not very good for the engine.
I only switch it off when on hilly road (30-50MPH speeds) to stop the transmission grom "hunting" for a right gear.
If you need peppier car, buy a tC. :D
As far as engine braking goes, I've noticed that the car is quite smart. I was coming down a long hill (coasting at about 40MPH). Car was speeding up by itself. I then barely depressed the brake and held it on. Hill was steep enough so the car was still speeding up a bit. Then, it automatically downshifted which used the engine braking to slow down the car. I was impressed. Seems that the computer sensed that the brake was applied and the car was still speeding up, so it tried to assist the brakes by downshifting. BTW, all of this happened with the O/D still active.
Polar White 2006.5 xB the "Fridge"
Blue 1985 Caddy Eldorado Biarritz (for pimpin')
just think of your auto trany as a mountain bikes gears. when you have your bike in first gear you can peddle really fast but you dont go that fast, and if you start in the higher gears its really hard for it to start moving but once your moving along its realy easy to peddle and maintain that speed. and if your going fast and you switch gears into first remember how fast you have to peddle to maintain your current speed. the trany works the same way. use the OD its a life saver on your motor and trany. and yes click it off when you start climbing hills.
Mods as to date:
Halo Projector Headlights
K6 Carbon Power Mirrors with Blue LEDS
LEDs in: 4 air vents, 4 door handle grabs, Front & Rear Speaker Grills, Cup Holders
1200w Sony Amp
JL Audio 12-Inch Sub 12W1v2-4, 4-ohm