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How do the latest automatic transmissions match the efficiencies of manual gearboxes?

Traditionally... The major drawbacks of automatic transmissions were: parasitic losses in the torque converter, something which manual transmissions don't have. fewer gears, so a given engine was ...
Zaid's user avatar
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23 votes

Why is the speed of a motorcycle measured at the front wheel?

There are pros and cons of each, remember you can easily spin or lock up the rear wheel, and in fact the rear wheel may be far less often at the correct speed. So the decision on this stems from ...
Rory Alsop's user avatar
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20 votes

How do the latest automatic transmissions match the efficiencies of manual gearboxes?

A lot of new automatic transmissions (e.g. Volkswagen DSG) arent actually auto transmissions, at least not in the traditional sense. They have a normal computer-controlled dry clutch (well two ...
MadMarky's user avatar
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13 votes
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Why is the speed of a motorcycle measured at the front wheel?

Its not a rule of thumb that the Speedometer is connected to the front wheel. There are many Suzukies and hondas in my country that have the speedometer connected to the rear wheel. As Rory stated, ...
Shobin P's user avatar
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13 votes

Factors Limiting EV Battery Acceptance Rate on DC Fast Chargers

Generically speaking, higher charge rates will heat a pack more quickly than the lower rates. Tesla models are designed and constructed with active cooling as well as appropriate monitoring and charge ...
fred_dot_u's user avatar
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12 votes

Why is the speed of a motorcycle measured at the front wheel?

The front wheel is used in most cases with mechanical speedometers (though there are exceptions) because it's just easier (and probably cheaper) to couple the front wheel to the mechanism. ...
Jakub's user avatar
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10 votes

Oil Cooled vs Water Cooled

I am assuming that by cooling you are referring as to which Engine cooling systems are better in particular scenarios... Oil-cooled: Traditional Oil-cooled engines are most commonly found in passenger ...
Jay Vyas's user avatar
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9 votes
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How did luxury cars provide smoother rides without active suspensions?

Assuming they were the base models, the two cars you mentioned (Acura TL and Mazda6) are both Front-Wheel Drive (FWD), while the Mercedes is Rear-Wheel Drive (RWD). The FWD cars, having both their ...
MooseLucifer's user avatar
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8 votes
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Designing IC engine

This looks like your first posting with Motor Vehicle maintenance and repair site. It looks like you are an engineering student, looking at a possible school project. Is that right? Welcome to the ...
zipzit's user avatar
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8 votes
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How do seat belts function?

I am assuming that you don't mean to ask how the belt holds you in place. :) I'm assuming you are asking how the mechanism works. I'll break this into two parts. The simple mechanism and the ...
anonymous2's user avatar
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8 votes
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Cast or Forged Wheels, is there any real-world difference?

I think bubbles are less likely to have anything to do with it. The forging process makes the metal more durable by aligning the grain of the metal. After forging, there is less of a chance for stress ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
8 votes
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Oil Cooled vs Water Cooled

Oil Cooled and Water Cooled are terms used by Manufacturer's to differentiate the slight difference between the cooling systems. Note that this is specific to only motorcycles as almost all of the ...
Shobin P's user avatar
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8 votes

Factors Limiting EV Battery Acceptance Rate on DC Fast Chargers

One of the issues you face is that the battery capacity is itself one of the limiting factors for the power a battery can take. This is typically referred to as C-rating. That means you can charge a ...
Arsenal's user avatar
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7 votes

How do seat belts function?

To add to the other great answers, I must point out that seat belts 'work' to reduce the impact on the passenger by stretching. In a large impact the fabric stretches quite significantly, don't ...
Grantly's user avatar
  • 311
6 votes

Why is the speed of a motorcycle measured at the front wheel?

All of my competition cars have had speedos, some of which didn't work at all. I have never once been in a race and had time to take my eyes off what was happening around me to look at the dials. ...
Steve Matthews's user avatar
6 votes

How do the latest automatic transmissions match the efficiencies of manual gearboxes?

With a greater number of gears in the autobox and with a lock-up function called more frequently for the fluid flywheel. Then add a better computer based control system for moving between gears : ...
Solar Mike's user avatar
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5 votes

Cast or Forged Wheels, is there any real-world difference?

For the average user, the answer is no. There have been tests done to determine which one actually works better, and it was determined that the forged wheels did provide for better acceleration ...
anonymous2's user avatar
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4 votes

Why do modern vehicles omit a temperature gauge?

Your sample may just be non-representative. All the ones I know (I'm mostly into Japanese performance cars) have oil temps. Even many non-performance cars have an indicator that goes out once the ...
Rory Alsop's user avatar
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4 votes
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Position of brake calipers different between wheels

I don't believe there is a special placement in consumer vehicles. Most are designed with space in mind and ease of servicing. With the energy being transferred from the spinning rotor to the ...
CharlieRB's user avatar
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4 votes

Water in vehicle tyres

This is common practice in the agricultural industry ( I worked as a agricultural contract driver) as it is an easy and cheap way of adding weight to the tractor when needed. It works as the ...
Solar Mike's user avatar
  • 34.6k
4 votes

Factors Limiting EV Battery Acceptance Rate on DC Fast Chargers

You have to remember that charging curves don't stay at the maximum charging power. The fall off pretty linearly towards 80% state of charge. So, consider for example Toyota bZ4X which is available in ...
juhist's user avatar
  • 14.6k
3 votes

Design of a double A-arm suspension

If pictures can tell a story ... my answer is sure:
Pᴀᴜʟsᴛᴇʀ2's user avatar
3 votes
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Why do vehicles handle better with heavy loads?

The smoothness of the ride is determined by the ability of the suspension to respond to changes in the road surface without affecting the body of the car. The ratio of sprung to un-sprung weight will ...
HandyHowie's user avatar
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3 votes

1 Piece versus 2 Piece Drive Shaft

One piece designs necessitate a lighter material, such as aluminum, which requires a larger diameter shaft to achieve the same strength as the stock steel shafts. There are several issues with this ...
Michael John Turner's user avatar
3 votes
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Why do Formula 1/Indy cars use high profile tires?

According to Mercedes' Technical Director on this article (http://www.autosport.com/news/report.php/id/119331) "The subject of bigger wheels has been raised many times over the last five or ...
Mauro's user avatar
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3 votes
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Is it possible to have a car without direct control of the wheels?

The system you are talking about is called steer-by-wire and has been attempted in the past. The only vehicle I'm aware of which has attempted it was the Infiniti Q50, but it seems after negative ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
3 votes

Automobile research

Your best bet is to ask a whether an automotive company wants you to do a project for them. That way, it's guaranteed your project has an actual need and is not of only academic interest. That said, ...
juhist's user avatar
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3 votes
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Why aren't automatic transmissions lubricated the same way as manual transmissions?

Because they are very different. A manual transmission is basically just a bunch of gears, shims, shafts, and synchronizers bathed in oil that gets swung around by the gears sitting in the oil. An ...
H. Daun's user avatar
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3 votes

Factors Limiting EV Battery Acceptance Rate on DC Fast Chargers

To answer your question The battery size (kWH storage) and intake rate of charge (kWH) are intertwined. Because when you are injecting 100kW (340,000 BTU/hr) into anything, the limiting factor is the ...
Harper - Reinstate Monica's user avatar
2 votes

1 Piece versus 2 Piece Drive Shaft

Especially in 4x4 vehicles, a two piece Tail shaft is best. Most custom conversions to a one piece suffer when both rear wheels lift off the ground because the tail shaft usually hits the cross ...
Good Vibrations gone bad's user avatar

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