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Load transfer! 1)

Load transfer! 1)

Hello everyone ♪

Are you doing your best  "not to grip too tight" or "not to pry" the handle?

This time, let's talk about "load transfer".

It is easy to understand if you have a G-sensor (accelerometer), but the direction of movement of the car is a combination of three directions: front-back, left-right, and up-down.

The load moves backwards when accelerating, forwards when braking, to the left when turning right, to the right when turning left, and up and down if there is a gap.
This vertical load transfer must also be controlled to some extent, but in this article I will talk about the forward and backward load transfer.

This is about acceleration and deceleration, but also about acceleration by accelerator work, engine braking and foot braking.

First of all, the role of the engine brake is only to be used for a "smoothly shifting the load transfer".

When full braking from full acceleration, if there is no engine brake, the center of gravity will move rapidly from the back to the front, and the stability of the car will be impaired, and passengers will also feel uncomfortable. 
With some exceptions, the engine brake is used only for postural changes.
Yes, basically I don't use the downshift engine braking.

The reason why the accelerator is pushed when downshifting in a race etc. is because of "Speed = Gear X number of revolutions".
And to sharpen up the next acceleration.
At full acceleration and full braking, try to apply force only in the direction of tire rotation.

Do not tighten your grip on the handle when moving the load back and forth.
And don't pry it.

next time,
Load transfer! 2)
In the next article, I would like to talk about "Left and Right" and "Left and Right + Front and Back".

 

~AdPower engineer staff~

Click here for the official Facebook page of Ad Power Japan.

Don't grip too tight! ~ Four-wheeled vehicles version ~

Don't grip too tight! ~ Four-wheeled vehicles version ~

Hello everyone!

Are you driving safely? Or are you driving like a maniac?

Whichever you do, it doesn't matter.
Let's drive in a way that doesn't bother others!

In this article I will talk about the method that I was taught to use to control the steering wheel during cornering and how to apply pressure.

 This is not a technique or knowledge to turn a corner quickly, but a trick for stable cornering.

I was taught this when I was 22 or 23 years old....

A few years ago, there was a story about a test driver of a car manufacturer in Japan in NHK's program "Professional".  

This test driver was talking about 'holding the steering wheel with three fingers'*.
The reason he said was "to feel the behavior of the car"
*Usually it's thumb, index finger and middle finger.

What I was told at that time was, "Don't gouge the steering wheel."

"If you turn the steering wheel while braking, there are places where it gets heavy.
When you turn the wheel while accelerating, there are places where the steering wheel gets heavier."

The tyres exert their force in the direction of rotation, but applying it laterally with the steering wheel increases the burden on the tyres.
"If the road surface is good, the tyre will do its best, but it will lose quickly, it will sag quickly.
In bad conditions, you lose grip.
If you let the tyres do their simple job, they will last longer and not slip."

If you drive with this in mind, you should not squeeze.
If you tighten your grip, you won't be able to feel the kickback from the steering wheel.
You can feel the behaviour that the cars dislike.

If this behaviour and load transfer can be done smoothly, the passenger will not get motion sickness.

If you can do this, your safety margin will expand.

~AdPower engineer staff~

Click here for the official Facebook page of Ad Power Japan.

Tires are an important part for our life

tire

tires


Last time, I talked a lot about "engine break-in" to make your car your
own.
This time, I would like to talk about "tire break-in".
table of contents.

1. Review from tire knowledge

First, let me talk about tire knowledge.
As a general premise, it is impossible to use used tires. The date of
manufacture and factory can be identified by the symbol printed on
the tire, but the tire begins to deteriorate from the day it is
manufactured. Rubber, which is the main raw material, is vulnerable
to ultraviolet rays, and just as old rubber bands click and cut, tires
also become stiff, reducing grip and cracking. As an example, French
tire manufacturer Michelin collects high-grip tires for unused
motorcycles from the warehouse for a certain period of time from the
date of manufacture. "Because the performance drops and it is
dangerous."
In addition, tires that are assembled on wheels are burned by the heat
of running, and the ears of the tires that come into contact with the
wheels stick to the wheels and become hard, preventing air leakage.
So you can't trust a used tire that you removed from the wheel.
Even if it is an unused tire, tires that have deteriorated due to rain or
sunlight at the store have reduced ride comfort and grip.
When buying a new tire, it is best to buy a new tire that has been in
the early days and has been managed in a warehouse. In addition,
the best tire brand is the one specified as genuine or the one of the
upper model of the same series, but there are requests such as "I am
worried about tire noise", "I want to emphasize wet performance", "I
want to emphasize dry performance" etc. For example, consult a tire
advisor to decide.
By the way, I am also a tire advisor.
For normal use, the normal tire is the best, but if you have dressed up
or customized and changed the suspension, please decide according
to your preference. If you change the size of your tires or wheels, you
will need to consult your store's tire advisor to change the alignment
and air pressure. It is difficult to balance the appearance and drive
comfortable, so please consult with your wallet and a specialist to
determine the ideal you are looking for.
The price of the tires you worry about varies depending on the size of
the vehicle and the size of the tires, but in the case of the Prius (195 /
65R) it is about 6,000 yen per tire, and if it is high, it will exceed
20,000 yen per tire.
Tire life is 30,000 to 50,000 km or 3 to 5 years for summer tires. If the
tire groove is 1.6 mm or less, it violates the Road Traffic Act, and the
passing line of the vehicle inspection is also 1.6 mm.

2. About break-in of tires

So much for the long introduction, let's talk about the main theme,
"tire break-in."
After replacing the tire with a new one, the tire is conditioned, but
when the new tire is assembled on the wheel and inflated to increase
the pressure inside the tire, the tire swells. In addition, the weight of
the car causes it to bend.
By running for a certain period of time in this state, the tires and
wheels will stick together due to the heat of running, air leakage will
disappear, and the entire tire will be burnt.
Depending on the driving conditions at this time, the quality of break-
in will change. It is a good condition when driving on a highway that
can run at the same speed with less unevenness on the road and no
start and stop. This is because once you start driving, you will not
stop, you will be able to keep a constant number of revolutions, and
the heat will be evenly applied.
After driving about 50km, I think the tires and wheels are getting hot
overall.
After driving, if the tires and wheels cool to almost room temperature,
the break-in is finished and the tires will harden in a shape that
matches the wheel size.
Tire break-in is to be in close contact with the wheel and to have a
shape that matches the weight and size of the vehicle.
So I can't trust used tires.

many tires

After that, if you rotate the tires at regular intervals, it will be longer
life. If the tires are worn out or unevenly worn, they are out of
alignment and should be adjusted. Also, it is not recommended to
remove it from the foil and rearrange the front and back of the tire.
By the way, the air pressure of my car is 10% higher than the
specified air pressure because it is mainly used on general roads, but
it is 20% higher on expressways in the summer.
It is best to replace a flat tire with a new one, but due to wallet
circumstances, we may repair and use it. Since the fiber belt of the
structure inside the tire is broken, please use it as a rear tire or drive
comfortably and quietly.
If it is a motorcycle, it will be replaced immediately.

3. Will new tires slip? Noisy?

It is often said that "new tires slip" and "noisy", but they slip because
they are before the tires are conditioned and peeled off. Since it is
molded with a metal mold in the manufacturing process, the surface
is slippery. Furthermore, the sound changes when the tread pattern
(jagged tires) changes.

4. Summary

It is said that "tires carry our life", and I think that's right.
Warming up and maintenance are very important because it is a car
that saves lives.
Next time, I will talk about "puncture prevention driving method"!


>>Word explanation
·suspension
Parts between the tires and the car body that cushion the impact from
the road surface and improve the driving comfortable.
·alignment
Also known as "wheel alignment". Subtle tire-to-car angle distortion
caused by driving. By adjusting the deviation, the tires will wear out
evenly and will be longer life.