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39 votes
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Need I press clutch pedal while starting my car in neutral?

It depends on the specific vehicle. Many modern standard transmission cars in the US have a clutch pedal sensor that will not allow you to start the vehicle if the pedal isn't fully depressed. You'...
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  • 24.3k
27 votes

Need I press clutch pedal while starting my car in neutral?

Being from Canada, I feel compelled to mention that if you do not depress the clutch while starting when it is at all cold out (let's say < 0 Celsius) you will notice the starter motor labouring ...
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26 votes
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What's the best gear to leave a manual vehicle in when parked?

The lower the gear, the better the job the engine compression will do at holding the car if the brake fails, that's because a lower gear makes the engine spin faster and requires it to do more work ...
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  • 14.3k
19 votes

What's the best gear to leave a manual vehicle in when parked?

When I'm on a hill with the front of my car facing up the hill I park the car in first and turn the wheels away from the curb so the transmission is fighting against gravity. When I'm on a hill with ...
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15 votes
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Is reverse gear in a manual transmission equivalent to any other gear?

Reverse is pretty equivalent to first gear, for a ratio of around 3.2ish. If it were any lower, it would be difficult to get started from a stop since the torque just won't be there. If you've ever ...
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  • 484
13 votes

Does an increase in horsepower allow a greater speed in any given gear?

The answer is no because you mention being limited by your redline. Regardless of power, a certain RPM will result in a certain speed for a given gearing. Chances are the gear ratios were chosen ...
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  • 13.2k
12 votes

Is shifting to neutral on a decline more fuel efficient than keeping the gear engaged?

As DucatiKiller notes, coasting downhill in neutral is usually considered unsafe, as it increases the chances of overheating your brakes. It is also illegal in many jurisdictions. Questions about ...
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12 votes

What stops a car window from falling down?

Every window has what's called a window regulator (here's a representative image): The window itself attaches to the window track. This keeps it steady and level while moving up and down. As you can ...
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12 votes

What's the best gear to leave a manual vehicle in when parked?

So, looking at a couple common manual transmission gear ratio charts, first gear would be best. Why? It has the highest ratio. Although it is (in the charts I found) very close to reverse. Here's a ...
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11 votes

What differences are there between straight cut and helical cut gears?

Great question! There are several basic differences. Here is my main article that I am pulling from. Firstly, straight-cut gears produce less side-to-side torque, allowing the engine to deliver much ...
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11 votes
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Does an increase in horsepower allow a greater speed in any given gear?

Summarized Answer No, HP does not determine MPH in a gear, the gear ratio does. Although there are hypothetical ways that HP can seem to make the vehicle go faster in the same gear, it doesn't ...
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10 votes

Is it OK to skip gears on a motorcycle?

It depends on how you do the skipping If, when you do it, you hear loud clunks, that means you are not matching the RPM's to the road speed, to the transmission. Motorcycles have a synchronous ...
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  • 32.8k
10 votes

Switch from N to D without brake

Should be no problem at all. The manual is being overly cautious, since the usual case for shifting from neutral into drive is when you're stopped hold the brake will prevent the car from starting to ...
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10 votes
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Switch from N to D without brake

No harm done On contemporary vehicles there is no direct mechanical linkage between the gear selector and the automatic transmission. Instead, the gear selector selects a "state" (e.g. N, D, R, 1, 2....
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  • 39k
10 votes
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Driving down hill in gear without throttle

As you say you change gear from 3rd to 4th, this means you have changed the gear ratio between the engine and the wheels causing a different engine rpm.
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9 votes
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Still safe to use a helmet when it's dropped?

How could you possibly know that the helmet had never been dropped from the moment of its manufacture until it came into your possession? Even once you do own it, can you really be sure it's never ...
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9 votes
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1st gear hard to engage unless stopped, Subaru 2004 Impreza Outback Sport

I'm assuming no one here answering has driven a Subaru manual transmission before or long enough. I'm fairly certain there is nothing wrong with your synchros or transmission. Subaru's are generally ...
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  • 324
9 votes
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My car locks lower gears when on high speed, why?

I'm assuming you have a manual transmission. Stop doing that, you will damage your transmission. Your powertrain can be broke down into three sections. The engine, including the fly wheels. The ...
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  • 15.9k
8 votes
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What would happen if you shifted into reverse while you are going forward?

My theory is that the engine would be forced to rotate the other way around, wouldn't it? Then, because of that, the engine would stop, and therefore it will "generate" a lot of force to the ...
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8 votes

What's the best gear to leave a manual vehicle in when parked?

First gear when pointing down hill, reverse when pointing up. If your car ends up rolling, the engine will turn in the correct direction. If you park in reverse pointed downhill and your car rolls ...
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  • 189
8 votes

Does an increase in horsepower allow a greater speed in any given gear?

Well the simple answer is (as you suspect)... No. With fixed gearing, you are going to be doing the exact same speed at any given engine RPM with 100bhp or 600bhp.
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8 votes

Trouble getting in first gear when car is hot

While I agree that Solar Mike's answer is a possibility, you. might check the simple and inexpensive things first. Try changing the transmission oil/fluid. Sometimes this works wonders especially on ...
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  • 9,499
7 votes
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Rental car gearbox broke down

As far as I know rental companies have insurance that covers this sort of thing. This may be a good time to contact a lawyer. You can't break a gearbox by doing the wrong thing in traffic. You would ...
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7 votes
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Why are gears designed in this pattern in motorcycles?

Look at it this way, the sequence is indeed linear - 1-2-3-4 and so on, with the neutral sitting in-between 1st and 2nd gear. Which means, to shift to neutral from 1st gear (or down from second), one ...
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  • 2,186
7 votes

Why are gears designed in this pattern in motorcycles?

Chilljeet has a good answer, but it's also partially a safety thing. When you're slowing down to a stop, you're clicking down in the gears until you can't click down anymore. If the bottom gear was ...
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  • 71
7 votes
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Why are most motorcycles 5 speed than 6 speed?

There are three considerations when making a low end/small capacity engine Cost Reliability Space available 2 and 3 directly affect 1. To make a gearbox more reliable you need to make the parts ...
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  • 2,645
7 votes

Acceleration pickup of a car

How is a 0-100 run done? The fewest number of gears possible will be used, because that's the fastest way to get to a given speed. Engines typically put out their highest power in a certain band of ...
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  • 13.2k
7 votes

What does it mean to have a stiff first gear?

After reading the op's question again, following being prompted to by the comment below from @Gargravarr, I realised I needed to update this answer. I believe that the real reason that selecting 1st ...
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  • 20.9k
7 votes

"Keep in low gear" driving a gearless electric vehicle

Electric vehicles can "engine" brake by using the drive motors as generators. As they generate electricity they consume the car's potential energy - either from speed or elevation or both. The energy ...
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  • 14.3k
7 votes
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Why do we push start cars in second gear?

It doesn't "have to be done in second gear". It just usually works easier to do it there. The reason is simply as you put it, that being it isn't trying to spin the engine as fast in 2nd gear as it ...
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