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Manual versus automatic transmission gear boxes - geek84

Hi Folks

What are the pros and cons of having a car fitted with an automatic gear box rather than a manual one?

Thanks in advance for your responses

Manual versus automatic transmission gear boxes - skidpan

Having an automatic means unfortunate people with only one or no legs at all can drive a car. For the fortunate amongst us with 2 legs a manual is the only gearbox to have.

Manual versus automatic transmission gear boxes - Mike H

You'll certainly get a number of views from here!

I passed my test in 1970, and until 2007 owned and drove exclusively manual cars, except for a brief flirtation with a three.speed auto Saab 99 for 6 months in 1981, which put me off autos completely! The reason that it put me off was firstly, it was not powerful enough, and secondly, the fuel consumption from the 2-litre twin-carb auto was untenable at the time. Torque converter autos sap an amount of power, resulting in poorer fuel consumption and on paper, worse acceleration. In practice, on the road performance is often similiar, unless you can perform racing-style instant changes which most drivers can't. Technology has decreased this gap, but I never thought I'd prefer an auto to a manual later in my driving career.

Roll forward to 2007, when I bought my Saab Aero estate auto - rather a bit more power, 5-speed, and lockup above certain speeds, which effectively means the same fuel consumption as the manual once it has lucked up. Would I go back to a manual now? Preferably not. I hired an Insignia estate diesel last autumn and drove a couple of hundred miles across country. The novelty of changing gear wore off after the first thirty minutes stuck in slow moving traffoc on the M27. Autos are more relaxing!

IMHO, for a torque converter auto you need a car with a decent whack of power and torque.

New technology has produced auto gearboxes such as the VW DSG, with two clutches and proper gears - an automated manual, rather than a true automatic. Pros of these are similar fuel consumption and performance to the manual version, but added complexity. Some also report driveabilty issues such as hesitaton when accelerating after slowing down. There are other auto variations (e.g. CVT), but others on the forum will be more informed about these.

I'm not sure what angle you are coming from with your question, but it all really comes down to personal preference. Not sure if I've really answered your question, but hope my thoughts help!

Manual versus automatic transmission gear boxes - gordonbennet

MikeH pretty well answers for me.

Particularly that an underpowered auto (actually all underpowered cars are miserable) is an unpleasant thing, unless in town.

I have owned TC autos for years, i have driven some of the latest CVT autos, particularly Toyota and they are very good.

I wouldn't give you a thankyou for an automated manual box designed by satan, i would only suffer a DSG box under protest if owned by someone else.

I'll qualify my hatred of automated manual boxes, in that i've probably covered over a million miles in them, in lorries, and except for Volvo's superb offering, the rest are varying levels of junk that unless overridden and driven in manual mode cannot offer normal progress...just like those fitted to cars then, and i've delivered thousands of the those in my previous work, and haven't got a single good word to say for any one of them.

Edited by gordonbennet on 08/06/2014 at 10:05

Manual versus automatic transmission gear boxes - Sofa Spud

QUOTE:..."" - an automated manual, rather than a true automatic.""

In my book, if it can change gears by itself it's an automatic, whether it's got a torque converter and planetary gears or two clutches and synchromesh spur gears !!

Edited by Sofa Spud on 08/06/2014 at 11:57

Manual versus automatic transmission gear boxes - Mike H

QUOTE:..."" - an automated manual, rather than a true automatic.""

In my book, if it can change gears by itself it's an automatic, whether it's got a torque converter and planetary gears or two clutches and synchromesh spur gears !!

I take your point. I was thinking too deeply! To clarify for the OP, it makes no difference to the end user - the driver - how it actually works.

Saab had a short flirtation with a system called Sentronic back in the 90s, which had a normal gearstick but no manual clutch, movements of the gearstick automatically activating the clutch. Potentially the worst of all possible worlds!

Manual versus automatic transmission gear boxes - scot22

MikeH thanks for a very informative and helpful post - its made things a lot clearer for me ( a subject I've a long standing interest in ). As you say there are a variety of views and it comes down to personal choice : and fortune !

I had a manual Saab 9-3 and loved it. Do you know when Saab stopped being properly Saab ? I might have a look at one of those.

GB, you said Toyota CVT is good - do you know anything about Mercedes CVTs ?

Thanks.

Edited by scot22 on 08/06/2014 at 15:31

Manual versus automatic transmission gear boxes - gordonbennet
GB, you said Toyota CVT is good - do you know anything about Mercedes CVTs

Afraid not, didn't know they were going down this road, much too modern for me anyway, i'm staying in the 90's, by design if not registration date..:-)

Manual versus automatic transmission gear boxes - scot22

Sounds a good idea GB. Definitely avoid the electonic handbrake !! All the A class W169 which were auto have CVT ( I know there are plenty of negatives for A class but so much of it suits our motoring needs ).

Manual versus automatic transmission gear boxes - bear807

Automatic is only good for places where there is heavy traffic (not much use in UK unless in metropolitan area), is more smooth and more convinent in many ways. If it is maintain properly it shall last! but you have random issues with the gearbox with newer technology. I would say the only bad point is at time you cant control and it can become very dangerous! I used to have a 53 plate automatic supermini there was a time i caught in heavy snow, there was a time i have almost lost control and crash while going down hill too quick the L gear is simply useless. After that i never wanted an automatic again, i perfer manual because everything is on your hand control and is less troublesome to maintain!

Manual versus automatic transmission gear boxes - coopshere
If you are buying an older car and/or want to carry out your own maintenance then an automatic is probably not for you (GB will probably disagree but he is one of the few exceptions). Whereas you could change a clutch or even strip a manual gearbox yourself this will not be possible with an auto unless you have access to specialist equipment and knowledge.

Much of what has been said above is relevant though some of it is just based on personal preference or dislike.

Manufacturers are often disingenuous with their descriptions when referring to automatics. Many call their transmission variants automatic gear boxes when they aren't. The original automatic gearboxes were generally a true automated gearbox coupled to the engine via a torque convertor. There are still a few manufacturers offering this type of gearbox and modern versions are very smooth and offer smooth motoring with, in some cases, at least as good fuel consumption as a manual version.

A lot of manufacturers now use other automated types such as CVT, DSG, Powershift, and Automated Clutch. The closest of these to the original automatic is probably the CVT as all the major components are contained within the gearbox though there are versions which also have a torque convertor. The DSG and Powershift versions use a different system containing an automated dual clutch system within the gearbox. The automated clutch is simply that, a manual gearbox with a clutch system that has been automated to save you having to use a clutch pedal.

All of these systems have their own idiosyncrasies and whether they suit your ability or style of driving is something you won't know until you have given them a fair testing.

Having had an extensive driving experience with manual and conventional auto style gearboxes and now enjoying a more sedate style of driving, which doesn't mean slow, then given the right circumstances I would always choose a conventional auto now. However in a new or nearly new car the options for this are limited as a many manufactures have moved away from this type of auto to the other types mentioned which does limit your options.

The options of transmission are almost infinite today and the only way to judge whether any one is suitable for any individual is to research and test. Every driver has different abilities, needs and preferences and when coupled with cost means there is a type out there to suit everyone.
Manual versus automatic transmission gear boxes - Alby Back
I like and enjoy driving either manual or automatics. But maybe I like big wafty powerful autos and perhaps small nippy manuals are a preference.

I think, for me anyway, the tipping point is probably either side of 150bhp - 200bhp or so. Below that power output I'd most likely prefer a manual. Above it I'd probably have an auto.

Wouldn't be a deal breaker at the upper end but I'd probably avoid a small underpowered auto.
Manual versus automatic transmission gear boxes - Happy Blue!

Its more to do with torque I find. My S-max is heavy and has only 140bhp. Yet with lots of turbo-diesel torque it is plenty fast enough.

Manual versus automatic transmission gear boxes - John F

There is little point in listing the pros and cons, it's the weight you give each that counts.