Unless you are towing a large load, or on a long uphill road, there is little reason to turn it off. Disengaging the overdrive probably also shuts off torque converter lockup, which means that the torque converter is going to be shearing the heck out of the tranny fluid, and generating a lot of heat. I have a Pontiac Vibe with that arrangement and for city driving I keep it off because I get faster acceleration with the button off. Climbing steep mountain roads may make your engine overheat, so according to the City of Colorado Springs, which is in the southern region of the Rockies, it's important to take steps to make sure your engine stays cool:. Switching it off reduces fuel economy, increases engine noise and only really is useful outside of those situations for passing power, but most cars have a kickdown system which will downshift the car anyways if you stamp on the throttle hard enough. The simple answer is when your computer can no longer detect any signal from the throttle position sensor. That's pretty standard. This is a safety feature enforced by the computer so that your engine doesn’t get too damaged. [Why it will disappear] The overdrive unit will make the car act as though it has gas-saver gearing instead of drag-race gearing. What could be causing my cruise control to not work right? Just do yourself a favor and leave the OD off when you're really getting on it. Forum discussion: I have a 2005 Ford Crown Vic police interceptor with 67,533 miles. Then manually shift into 3rd gear. It might feel and sound "faster", but it's just tearing up the car and you'd probably be getting about 8mpg driving like that. You will always start moving in 1st gear, then the transmission will automatically upshift into the next higher gear until it has selected the highest gear you've allowed with the shift lever. Then follow 4 steps below: Assuming you have latter system, it "should be off" whenever you want it off and don't mind the somewhat worse mpg... though of course at a steady speed it doesn't usually matter because steady speeds mean your gear is already pretty much fixed, and torque converter locked. Depends on your setup and whether you mean faster top speed, or faster acceleration. Up a hill the car should downshift automatically. For example the FR-S randomly has 5-6 as overdrive gears. Once that’s taken care of, the transmission fluid can be refilled, and you can road-test your car to make sure the issue has been resolved. You may have a slightly higher top speed out, but I doubt it. and a 17' Spirit Delux and a sway … Join Yahoo Answers and get 100 points today. You never want to switch the overdrive from on to off or vice-versa while in motion, except in extreme instances. Ok so I drive an automatic 4 cylinder 2005 scion xb and I see it has an overdrive button, I know it has to deal some with gas mileage but I don't quite get it, will my car go faster with overdrive on or off? James, I believe the overdrive will default to on when you turn the vehicle off. Surely you know how to SEARCH, right? When it kicks into overdrive it lowers your RPM's buy about 400 rpms. I want to go alot faster since this car has a slow acceleration. So if it bothers you, turn off Overdrive until your driving conditions return to normal. You will now notice that the RAV4 can accelerate much faster but can not operate well at speeds above 40 mph. Drops the RPM, locks up the torque converter on … If my key fob is able to lock my car from inside my house ? Leave it engaged, unless you are towing something or you have the thing loaded to the gills and you are in very hilly country at highway speeds. It’ll be below the button a driver uses to shift gears. Whoever suggested it needs to get off the highways, they're too dumb to drive. It won't make any difference with the throttle wide open. driver. If you top out at 4th gear and want to go faster you can still use your overdrive gears. Overdrive just forces the car to upshift to the highest gear which improves your fuel economy. We have to define fast. When you drive at more than 60mph (50mph in case of older vehicles), the RPM increases and the engine starts taking more and more strain. Overdrive can also be turned off to help you pass someone while you’re towing a heavy load. TOM: But in general, our advice stands. under most circumstances and most driving you will just leave it alone. If you leave it off all the time you could damage the motor. When you stomp on the gas for acceleration, such as to pass, the transmission immediately shifts down to third gear to give you the speed boost you need. ROFLMAO!!!! drive at 50 mile per hour and see what your rpms are in third gear then shift into overdrive at the same speed see how much less they are to go the same speed, well overdrive is mainly for gas mileage it is the only gear that is actually spinning faster that the engine .. it will be faster in overdrive if it has the power to push it but my guess is it doesn't but it wont make it any faster with it off. It definitely makes no difference down a hill. If you're going down a steep grade, or towing a trailer, turning off overdrive will allow your engine to rev to a higher rpm before shifting, which can help keep your speed down without relying on the brake as much. Having the overdrive off is fine if you are driving in hilly areas, but if you are on the highway, it is best to have it on because you will get better gas mileage. It won't make a stick of difference in or out of overdrive. It provides higher speeds but acceleration is sluggish while in that gear. Overdirve is simply a higher gear that saves gas at higher speeds. The owner's manual will tell you when it's useful to use that button. I mean, that's not exactly "random" either but it's certainly more random than OD being exactly where it's always been on countless 6MT's, It will make you accelerate faster if you are already at highway speed or in the last (overdrive) gear. Once in "Overdrive", the engine doesn't have the torque to reach anywhere near redline of the engine. Turn off or unplug any electronics, including headlights, hazard lights, radios, or cell phone chargers in each vehicle. 4WD doesn’t improve handling on slick ice- and snow-covered roads. If you’re unsure which 4 wheel drive system you have, ask a dealer, who can figure it out from your VIN. Not sure what exactly is so random about that. At that time, your top priorities should be the safety for you and other people driving on the road. They will just take more time to reach max speed because your engine isn't working hard through those last gears. Overdrive is an extra higher gear in your transmission designed to increase fuel economy and drivability in freeway or long steady drive conditions. I'm a senior female and am planning on driving from the coast of Texas to northern California this September. The overdrive does not kick in until you are shifting from drive to overdrive. Turning OD off when at a constant highway speed is dumb as hell, Tai. ... sun gear turning the ring gear. I have a 2004 Jeep Liberty V-6, 4 wheel drive, auto transmission, rated to tow 5000 lbs. It's a Scion. For instance, it can be used when you are driving at a high speed and your engine is straining with high RPM, such as freeway or highway driving.But it is not the right button to press when you are driving in a city, or if you are running at the speed of less than 50, that too inconsistently. On the same note, your car will go faster for a given engine RPM. Your car will have a faster top speed with the overdrive on. This isn’t a common use, however, as depressing the gas pedal firmly should be enough to let your car’s computer know that you want to downshift. However, turning overdrive off is a surefire way to stay out of the tall gears. However it doesn't affect acceleration at … 2 Press question mark to learn the rest of the keyboard shortcuts, '00 Regal GS | C5 Corvette (SC) | 91 Civic (Jesus). Out of "Overdrive" you'll reach redline, maybe, but be burning more fuel. Page 1 of 2 - When do I need to turn my overdrive off? It's a quick way to ruin the drivetrain. Overdrive as a definition is simply having a faster transmission output shaft speed than the input rotation speed of the input shaft from the engine. It is o.k. Overdrive tells the car to use a higher gear as soon as possible to increase mpg. the trans knows what to do. The top of 3rd at red line is probably close to 90 mph, with overdrive "engaged" the car might in theory reach 150 mph, but I doubt a Scion xB can pull the red line in 4th "overdrive". This makes local driving smoother and more manageable. to turn it off or on when driving at any speed but doing it repeatedly can overheat the torque converter and fluid burning up the trans. When To Use Overdrive Overdrive is an incredibly useful feature, and it’s one you should use the vast majority of the time. For the vast majority of drivers, driving conditions and cars, people with automatic transmissions can just leave the car in Overdrive all the time and forget about it. What is Overdrive & When to Use it? Towing, definitely don't use the overdrive selector. You'll get better gas mileage. I know overdrive should only be off when towing or going up/downhill but does OD off make your car accelerate faster, Or faster in general? The purpose is generally to improve efficiency and reduce noise. In most cases, you won’t notice any prominent ghosting/trailing behind fast-moving objects even with overdrive set to Off or Low, but the Medium/Normal setting will usually work best. Too much overdrive can introduce inverse ghosting or pixel overshoot, so don’t use it unless you experience excessive smearing in fast-paced games. As far as what overdrive does, go google it. Air drag goes up as the square of velocity, and I think you'd be luck to see much more than 110 to 120 mph. The purpose is to allow the engine to run at a lower rpm for better fuel economy when cruising. This does not mean you cannot drive with overdrive on when in town or city driving as your car will automatically downshift when … It puts your car in a higher gear so that the engine can "relax" basically, New comments cannot be posted and votes cannot be cast. Why wouldn't all cars have a rear windshield wiper? For a 4 cylinder car, I need all the acceleration I can get. I really don't think leaving OD off will make you any faster, since all it's doing is turning the OD off. Overdrive only means that the transmission is now turning the output shaft of the transmission faster than the input shaft, or more than 1:1 ratio. Turning off the overdrive will have absolutely no effect on acceleration from a stop. Still have questions? But also please explain to me what overdrive is and what purpose it serves as well. A close-up of the wheel-drive motors and gearing shows how the Overdrive cars steer and get power. With the overdrive OFF , you get engine assisted deceleraion just by letting off the gas pedal. There can be changes in the tire friction as the car moves, as well as other variables that can slightly change the motor speed. Use of the term is confused, as it is applied to several different, but related, meanings. Assuming it's a 4 speed auto, there will be absolutely no difference in acceleration at WOT (wide open throttle), at least until you hit the red line or computer-controlled shift point at the top of 3rd gear. Whether the car will go "faster" after that depends on how much power the car has. We serve as Reddit's central hub for vehicle-related discussion including industry news, reviews, projects, videos, DIY guides, advice, stories, and more. Your car will have a faster top speed with the overdrive on. And you have a Scion XB. This usually occurs around 45 mph. Switching it off reduces fuel economy, increases engine noise and only really is useful outside of those situations for passing power, but most cars have a kickdown system which will downshift the car anyways if you stamp on the throttle hard enough. Overdrive can help a car to go faster, but it’s really focused on allowing the engine to run at a lower RPM while maintaining the vehicle’s current cruising speed. What would happen if I poured concrete into my crank case, radiator and/or gas tank? Any problems with running 40:1 2-stroke gas in an engine designed for 50:1 other than lots of smoke? Overdrive locks the torque converter so that engine speed is exactly the same as the transmission input shaft speed increasing mileage. If your car is struggling while heading up toward the summit, shift into a lower gear so that you can maintain a consistent speed. If you drive faster than conditions allow, you’re far more likely to flip and roll because of your higher center of gravity. Don't expect anything more. Turn the overdrive off once you have come to a complete stop. There are systems with a mechanical overdrive, eg a 4+3 trans, where in overdrive you would indeed theoretically get a higher top speed (gear-limited), though in practice that might not really work out. It is NOT normal for your car to jerk when you turn it off or on. - posted in The Casita Club Forum: I'm new at towing and need some help on a few questions, please. Your engine will turn at a lower RPM for a given vehicle speed. This can cause a lack of pressure, preventing the gears from engaging. You will NEVER need to shift into OD on the track w/stock gears because the car will go 140 mph in 3rd. The will likely force your computer to stall the engine and only allow it to run at low RPMs, which means the car will only move at slow speeds. when is a car ready to go to the junk yard? You can sign in to vote the answer. Leave it in overdrive full time unless you are driving up a steep hill AND the transmission keeps hunting between overdrive and 3rd gear. So the button to turn overdrive off is there to stop this problem. If you're just talking about the overdrive button on cars that tells the trans to use a higher gear wherever possible to increase mpg, that doesn't do shit for your top speed, and if your foot is on the throttle hard enough, it shouldn't affect the shift points during acceleration anyways. It isn't a race car. Imagine one day you are driving on the road and your car turns off in a sudden. The lower your rpms are the less gas you will use. I got the car transferred to me this year from another unit that was disbanded within our department. 4 Steps to Do while Your Car Shuts Off While Driving. I don't think we're on the same sheet of music here anyway. Open the hood of each vehicle and put on … If your car doesn’t have an overdrive, uses a 26” tall tire, a 1:1 top gear ratio, and a 3.08 axle ratio, the engine speed at 70 MPH will be reaching anywhere around 2750 RPM. Turning overdrive on and off is a rather simple process that doesn’t take much thought. FR-S Gear Ratio Comparison. Overdrive just forces the car to upshift to the highest gear which improves your fuel economy. Before you turn are overdrive on or off, you should be wary of situations when you can use it. Having it off will have no bearing on how fast you get to the speed that it kicks in. It's basically like shifting down from 6th to 5th in a manual. What you should do in this case are to calm down yourself and not to panic. That's not overdrive, that's more like... performance shift. For example the FR-S randomly has 5-6 as overdrive gears. Random is these new 9, 10 speed transmissions that have overdrive gears all over the place like in 4th, 7th, 9th, 10th and skip gears when shifting during hard acceleration. The overdrive does not kick in until you are shifting from drive to overdrive. Overdrive is the operation of an automobile cruising at sustained speed with reduced engine revolutions per minute (RPM), leading to better fuel consumption, lower noise, and lower wear. This has a bearing on your gas mileage. When traveling at highway speeds your car is normally in its top gear (forth is usually overdrive). 4WD can be dangerous. You want to go fast in a Scion? Overdrive is more about fuel economy than speed, No, because you still need to run through your gears before getting to a overdrive gear. In some applications the overdrive can also act as a "splitter" to effectively double the number of transmission gear ratios. If i disconnect the battry cable on a 2010 Santa Fe Limited 3.5L will i have to reset anything after i connected it back? Okay so, my original points were, leave it on to get better gas milage, and I stated that in a 4sp auto turning off overdrive will leave the car in 3rd gear. Automatic transmissions work this way: When you select any given forward gear, you're telling the transmission NOT to shift into any higher gear. In most cases, the overdrive button can be found on the shifter’s left side. No, it does not. It’s the textbook condition for using the overdrive in automatic car. Overdrive is the highest gear in your transmission. Yeah. My shifter knob has a button to turn off Overdrive, but i just didnt remember to turn it off and try driving like that, but would turning off OD help me make it up these mountain passes? You can't ask about it being faster, as it's not "fast" in the first place. Press J to jump to the feed. How do I make both my front and tail lights flash left and right simultaneously. Turning on the OD will work like magic to take … With the overdrive ON , If your driving along, say 40ish not yet in overdrive, as you let off the gas pedal the trans now ques itself to shift INTO overdrive. overdrive is a forth gear in a three speed transmission.Your car starts out in first gear and goes thru the gears until it reaches overdrive .Overdrive runs the motor slower so you can get better milage but will probably never reach top speed.third gear will probably acheive the same speed turning the motor faster giving you worse gas milage.If you have a tach. Dirty transmission fluid: Metal debris and other contaminants can build up in dirty transmission fluid. How do you think about the answers? Overdrive improves fuel economy, and makes for less wear and tear on the vehicle when you are driving at highway speeds. Get your answers by asking now. That's the very operating mode Overdrive was designed for. Overdrive helps even at lower speeds (40-50mph) when you want to cruise without much engine braking but for normal city driving, leave it off. /r/Cars is the largest automotive enthusiast community on the Internet. This means the driveshaft will be turning at a faster speed than the engine. Trump now the ‘mayor’ of Mar-a-Lago, lawyer claims, Georgia county launches criminal probe into Trump, NBA player will be going to jail after season, Brand formerly known as Aunt Jemima gets new name, Group 'outraged' by American Girl doll with gay aunts, Rodgers-Woodley pairing isn't as odd as you think, Terez Paylor, Yahoo Sports NFL writer, dies at 37, Kidnapped girl, 10, saved by sanitation workers, Young Americans are so over the skinny jeans look, Spears says she's taking time to 'be a normal person', 3 people stranded on island for 33 days rescued. Anything after I connected it back extra higher gear in your transmission designed to increase mpg `` ''! 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For better fuel economy, and makes for less wear and tear on the when... To stay out of the engine to run at a lower RPM for a given engine RPM, maybe but! Be causing my cruise control to not work right the acceleration I can get to.