Bad driving habits could damage your auto gearbox

Hi guys,

Here are the 5 bad habits can damage your auto gearbox and cost you a lot a money to repair

BMW Steptronic Transmission—Best of Both Worlds | BMW Blog

  • Driving in Neutral (N) while go down hill                                                                           Some of driver tough they can save fuel by position gear in N while go downhill. Caution please !!!  Actually you driving in very dangerous condition.                       The gearbox will be damage when you make sudden shift from N to Drive (D) and same time you will use more often.
  • Change gear while car still moving

    Change gear from D to N while car still moving can damage your gearbox. Do not surprise some drive do this everyday. New gearbox has protection for abuse driving and help to prevent the gearbox from broken.

  • Change gear at high RPM

If driving like drag race, you gearbox will be broken and your repair bill will be high. In this condition the driver ramp at high RPM (May be 6000rpm) at static and shift gear to D to get maximum acceleration. This could damage internal part inside gearbox especially the clutch plate. The clutch plate could be slipage and cause the debris. the debris will block the hydraulic system especially the valve body.

  • Change gear to Parking (P) while still moving

This like you sudden hop on the moving horse, you might might damage your spine if you fall.

Same thing to this condition. Your internal gearbox will be damage if you shift to P without stop your car. It could be your gears, planetary gear etc etc.

This are some of the bad driving behavior could damage your gearbox in long term. The new gearbox with latest technology has protection to prevent the gearbox from broken or damage due to abuse driving behaviour. The protection could be from design and Transmission COntrol Unit calibration.

This information is from my experience and observation. Other driver could have different  situation and experience, please share your experience.

What did you think future transmission technology?

Currently we have various of transmission technology introduced into market by OEM.

For Automatic Transmission we have Step Automatic Transmission (AT), Continuously Variable Transmission (CVT), Dual Shift Gearbox (DSG) or Dual Clutch Transmission (DCT) and Automated Manual Transmission (AMT). The efficiency of transmission is improving and each regions have different requirements.

For Manual Transmission we have 5 speeds, 6 speeds and 7 speeds. Manual Transmission (MT) also improving especially on the gear shifting mechanism, bearing and gears..

I would like to have your opinion on future transmission technology heading especially for Automatic transmission.

== Steps ==

#Here’s some basics. Just like that of a manual transmission, the automatic transmission’s primary job is to allow the engine to operate in its narrow range of speeds while providing a wide range of output speeds.#Without a transmission, cars would be limited to one gear ratio, and that ratio would have to be selected to allow the car to travel at the desired top speed. If you wanted a top speed of 80 mph (130 km/h elsewhere), then the gear ratio would be similar to fourth gear in most manual transmission cars.
#You’ve probably never tried driving a manual transmission car using only fourth gear. If you did, you would quickly find out that you had almost no acceleration when starting out, and at high speeds, the engine would be screaming along near redline. A car like this would wear out very quickly and would not be drivable.
#When choosing between manual and automatic, one of the considerations is power.

  • If you want the most power from your engine, going with a manual transmission versus an automatic is most likely going to be your best bet.
  • While some modern automatic transmissions, i.e. CVT transmissions, manumatics, and conventional 4 or 5-speed automatic transmissions allow for some excellent acceleration, there is still usually a substantial difference in 0-60 times between these types of automatics and a 5 or 6-speed manual transmission.
    • For example, an automatic equipped Dodge Neon has a reported 0-60 MPH time of approximately 10.5 seconds.
    • The same Neon when equipped with a 5-speed manual has a reported 0-60 time of 8.1 seconds; a huge difference.
  • #While most cars do not have this large of a 0-60 MPH gap between auto and manual transmissions, 99 percent of the time you will receive noticeably better performance from a manual gearbox.

#The acceleration offered from a vehicle when equipped with a manual transmission is usually superior for a number of reasons; most predominantly due to gear ratios and the availability for more precise shifting. To explain, if you own a car that receives 200 horsepower @ 7,000 RPM, but your automatic transmission will up-shift under full throttle at only 6,000 RPM, you probably will never feel the full amount of power that your engine was made to offer. So, your engine may be stamped with a 200 horsepower rating, but because your car is equipped with an automatic that up-shifts too soon, you may be missing up to 20% of available power. On the other side, with most manual transmissions, you can usually take the engine revs to redline (or past). This enables you to get the most power possible to the front, rear, or all 4 wheels under full throttle take-offs.
#So, is fuel economy a huge issue?

  • If you answered yes, then going with a manual transmission is probably going to be your best bet, although it is far from your only choice.
  • Many newer cars with automatics have an EPA rating of only 1 or 2 MPG less than the same model car equipped with the manual.
    • With everything in life, there are exceptions to this rule. Some vehicles get better mileage (5 mpg or more) as an automatic compared to the manual, most notably in Toyota’s like RAV4, and the FJ Cruiser.
  • If this is the case, most people are not going to save a significant amount of money on fuel costs going with the 5-speed manual (especially if you do a lot of city driving).
  • Since the majority of drivers do not manually shift for economy (or know how to), the 1 or 2 MPG that is lost with the automatic can easily be gained.

#Maintenance/Repair costs:

  • Even though the automotive world has come extremely far with refining automatic transmissions, most automatic transmissions still need to be serviced far more often than manual transmissions (some auto manufacturers state that their manual transmissions never have to be serviced with fluid changes, etc.
  • Manual transmissions are also usually slightly/much cheaper to fix when something mechanical goes haywire. This is not always the case, but on average, a manual transmission will cost you less to repair than an automatic in the same type of vehicle.
  • The clutch disc in manual transmissions does need to be replaced on occasion. There are many factors that determine how long a clutch will last such as driving style, the material the clutch disc is made of, and the amount of city vs. highway driving. Clutch replacement is often a labor intensive task and can cost several hundred dollars if performed at a repair shop.

#You need to identify your Needs:

  • The engine that your car is equipped with makes a huge difference to which type of transmission should be chosen. To explain, if you are looking to buy a car with a 1.5 liter 4-cylinder that pumps out 62 horsepower, and 75 lb-ft of torque you will most likely want/need to go with a manual transmission. Since power in this case is extremely limited, you will need to make the most out of your engine for hill climbing, passing power, etc.
  • On the other hand, if you’re looking to purchase a car with a V8 or V6 that offers plenty of power at both high and low revs, then going with a manual transmission is more of a preference than a necessity. While most drivers will still benefit in acceleration and fuel economy by going with a manual, it is not as detrimental as it would be with a car that was limited on power.

#Some people can’t own a vehicle with a manual transmission for many reasons.

  • They might be unwilling to learn to use one.
  • They might have a physical handicap.
  • They might need to share the car with someone who doesn’t know how to operate a manual.

If this is the case then search for an automatic that combines both good shift patterns, and good fuel economy.
#If you are willing to drive a manual transmission, there are a few features to look for.

  • Manual transmissions all have their own unique shifting characteristics.
  • Many are geared for fuel economy, others are geared for sport driving, and then there are many that offer the best of both worlds.
    #If you prefer to have your right hand available at all times to multitask then you will definitely prefer an automatic transmission.
    #Check that are you a multitasker? Are you a multitasker that can do several things at once for a extended period? If you answered yes, then you qualify for a manual. If you answered no, then you do not. Manuals need you to concentrate on keeping your car on track, shifting the gears on time, and road hazards.
    #If you want a car for power, but someone who uses it for everyday driving also uses it, consider a semi automatic transmission. These transmissions are called diffrent names from one manufacturer to another. Usually, they’re found on the sport models. Basiclly, they are a automatic transmission with the option to go manual. If you go into manual mode, it won’t be the common shifter with 5 options, and you shift up, down, left, right, and that, but one with a + on the top and a – on the bottom. You push the shifter towards the + mark to shift up, and pull towards the – mark to downshift.

Honda develop 7 speed Dual clutch Transmission

The Dual Clutch Transmission (DCT) or Dual Shift Gearbox(DSG) is getting popular to the OEM car maker. Honda announce in January this year at Detroit US on the next generation of NSX will be fitted with sophisticated mid-mounted V6 engine, but also a dual clutch transmission and a hybrid driveline incorporating no fewer than three electric traction motors.

In my opinion the DCT or DSG is the future automatic transmission due to high efficiency and able to have bigger gear ratio span for fuel consumptions and emission & CO2 benefit.

 For fuel consumption reduction, I predicted CVT with clutch and DCT will have comparable fuel consumption benefit and higher compare to Automatic transmission. Even though the CVT efficiency is lower compare to Automatic transmission but when is combine with engine, the CVT will run at optimize gear ratio.

I do not any data to back-up my statement but from reading in internet, that what I found. If you have your opinion, please share and make a comment on my opinions.

Honda Fit outfitted with 7 speed DCT

ZF new 9 speed Automatic

Innovation with nine speeds

Economy with increased performance – ZF once again shows the automotive world that these two attributes aren’t mutually exclusive.
ZF is the first transmission manufacturer worldwide to develop a modern passenger car automatic transmission with 9 gears. It has been designed for vehicles with transverse engines and front or four-wheel drive and can thus be installed in 75 percent of all cars produced worldwide. This means that the transmission not only replaces the current longitudinally installed 8-speed automatic transmission, but it also represents an independent design for a transverse installation position. The concept study of this front-transverse transmission caught the industry’s attention already at the IAA 2009.
Sporty and fuel-smart

Compared to today’s standard 6-speed automatic transmissions for front-transverse motors, ZF’s new 9-speed automatic transmission clearly improves both driving performance and fuel economy.

This combines a new ZF production highlight with reaction and shifting times so short that they are almost beyond perception. It makes double- and multiple-gear shifting a reality. Thus, the new transmission system is equipped with the same ‘sporty genes’ as already its 8-speed automatic transmission predecessors; in conjunction with the excellent shift comfort characteristics, they certainly entail ultimate customer satisfaction.

You can refer to this link for better understand


Automatic transmission with Torque Converter vs Wet/Dry Clutch

Hi, it been quite sometime not update my blog information. Just today I would like to talk about the torque converter vs wet/dry clutch in automatic transmission.

In new modern world, automatic transmission become common application especially in Asia, Japan and US markets. Also sales keep increasing in Europe and China.

I just want to share about my thought about advantages and disadvantages of torque converter and wet clutch application for Automatic transmission including CVT. The number of gears keep increasing for automatic transmission

The main reason the transmission suppliers developing new automatic transmission is because of fuel consumption, emission and driveability. In numbers of year,  torque converter is dominan for automatic transmission but torque converter has disadvatage which is consume more fuel during start of operation because torque converter require more energy before it fully work. The torque converter technology has been improved such as lock-up system and also the design of torque converter has been improved.

Wet/dry clutch technology also has been many years such in Automated Manual Transmission (AMT) and one of the reason wet/dry clutch has been introduced into automatic transmission is because of fuel consumption benefit compare to torque converter. For wet/dry clutch,   it required control system to control the clutch engagement and disengagement. This require transmission control calibration accurately because this will affect the vehicle driveability and performance. Wrong calibration will make driver uncomfortable and difficult to drive. Some transmission manufacture claim the wet/dry clutch will improve the fuel consumption due to less energy required to operate the clutch system.

The torque converter application mainly Japanese car manufacturer and wet/dry clutch is European manufacturer. Both have their own reason when they adopt the technology.

In my opinion, the advantages of torque converter is the transmission have additional ratio during launching from torque converter and the vehicle has better launching feeling. Also, during climbing, torque converter did not have limitation on the oil temperature which will cause the transmission goto safe mode and has better climbing during starting launching  at slope. The disadvantages of torque converter is the fuel consumption and the transmission required more packaging space to accommodate torque converter.


For wet/dry clutch the advantages is better driveability, fuel consumption and less packaging space. The disadvantages is the clutch has temperature limitation and required careful calibration especially during traffic and hill climbing.

This my opinion and if you have different opinion, please share your comments and I would like to know more about the torque converter and wet/dry clutch

GM’s 6 Speed Automatic Transmssion

The Automatic Transmission technology is getting better and better every time transmission manufacture introduce into market. One of them is GM Powertrain.

General Motors introduced their 6T40 6-speed automatic transmission. It was built for small and mid-sized car market and promised to have better  fuel economy by 5%. The engineers at GM have been working  to improve transmission to have another 5% boost in overall economy.

The updated version of the 6T40 is based on the lessons learned while designing the drivetrain for the new Chevy Equinox. By redesigning the internal electronic control systems, such as changing the shift points, another 3% jump in fuel economy was recorded.

The other 2% came from gutting and rebuilding the internal components of the transmission. By replacing the hydraulic valve body with a more efficient unit and altering the friction plates to match, the overall losses from pump pressure and friction were reduced. Less friction and negative pressure means more power gets to the ground.

Alongside the new 6T40 transmission, GM is developing a dual clutch gearbox to use in later applications to boost economy even more, though no timeline has been announced.

Ford joins Dual Clutch Transmission Club

Ford just launch the new Ford Focus model with Dual Clutch Transmission. The DCT transmission is developed by Getrag Ford Transmission company. Read the details review from Autocar. The main aim for DCT is to have better fuel consumption and with DCT it can have smooth shifting and quick gear change compare to conventional automatic.

In my opinion, the DCT is the future transmission and as one of the technology to meet the stringent regulation especially the European legislation and US Federal regulation.  

The six-speeder is called Powershift, and is a rival to the likes of the Volkswagen DSG. Linked to a diesel engine, it’s being hailed for the environmental and financial advantages it provides over a conventional automatic box.

Powershift works by operating two clutches in parallel: one handles the odd gears (one, three and five), and the other even ratios (two, four and six). This allows the transmission to pre-select the upcoming gear, meaning a smooth, almost instant change, with no loss of torque in each shift.

On paper, the newcomer certainly looks promising. It delivers 320Nm of torque to the front wheels from only 2,000rpm, while a further 20Nm is available thanks to a temporary over-boost function. That’s enough to see the 134bhp Focus Powershift complete the sprint from 0-62mph in 9.6 seconds, while averaging economy of 48.6mpg on the combined cycle and emitting 154g/km of CO2.

Its vital statistics aren’t quite as strong as those of a standard manual Focus – which has a 9.4-second sprint time, returns 50.4mpg and puts out only 147g/km. However, the differences are negligible, which is pretty impressive for an automatic model.

The Powershift transmission is currently only available with this 134bhp 2.0-litre TDCi diesel and the less powerful 108bhp variant, and can be specified solely in the hatchback version of the Focus, as well as the C-MAX compact MPV. However, Ford tells us the set-up will be rolled out to other cars in the range before long.

On the road, it behaves similarly to a conventional auto – albeit a very good one – changing between gears quickly and smoothly. But the system really comes into its own under acceleration, gliding from ratio to ratio with impressive speed and accuracy.

Even when shifting down we were unable to catch it out. The box always selected the most appropriate gear without any hesitation or jerkiness.

Adding to the appeal is an intuitive manual mode, for drivers who want greater involvement. A red light on the Focus’s rev counter indicates the optimum time to change gear, and you simply pull the lever back to shift up. It’s easier to operate than DSG, which uses the stick the opposite way.

But there are no steering wheel-mounted paddleshifters with which to change up or down – and no Sport mode on the box, either – as Ford is keen to stress the gains in economy and emissions offered by Powershift, rather than its outright sportiness. Still, neither of these features is really necessary, because the lever is likely to spend most of its time in ‘D’, allowing the auto to make the most of the engine’s relaxed, torquey nature.

The combination of the clever new gearbox and punchy diesel performance with the Focus’s class-leading driving dynamics makes the Power-shift model a compelling package. But buyers pay for the privilege. The five-door Titanium-spec model we drove costs in excess of £20,000 – that’s more than the latest range-topping Focus ST.

So, we’re reassured to hear that in time Ford will make Powershift more widely available on cheaper, entry-level models. Now that really will be a change for the better.

Rival: VW Golf 2.0 TDI DSG
GERMAN giant led the way by filtering its dual-clutch technology down from performance versions of the Golf to lesser models such as the 2.0-litre TDI diesel. And the six-speed DSG transmission continues to set the benchmark by which rival systems are judged.

Read more:

Gear Shift Interlock System

The regulation and requirement is getting stringent depending on areas and country, Gear Shift Interlock system has been introduce to increase the safety.

Gear shift interlock system designed to have proper automatic transmission/CVT/DCT operation. The driver must depress the brake pedal in order to move the gear selector from Parking(P) position. Some of the manufacture put additional feature which is theignition  key cannot turned unless the gear selector in P position.

There are three type of gear shift interlock system which is full electrical, electrical/mechanical and full mechanical (using cable). Proton vehicle did not have this function and hopefully in future this feature will be available. It might be a little bit additional cost but for safety reason, the customer might consider. Manufacture like Toyota, Mitsubishi, Honda already have this feature in their vehicle.

For more details, please see Toyota Gear Shift Interlock system.

Toyota Gear Shift Interlock System