Weight vs performance: THE TRUTH!
video description
If brakes have enough stopping power to lock the wheels, more weight will just increase the friction coefficient, and therefore allow the car to use more stopping power. This Dacia test proved it again.
Naturally, brake fade (when heat generate by kinetic energy can t be absorbed anymore by the brake system) can play massive role, especially on racing application, but definitely not on a one off emergency braking.
Date: 2022-08-31
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Comments and reviews: 13
D! WEElp
That the braking distance is the same for every amount of mass added to the car makes absolute sense. As we assume that the maximum negative acceleration during braking is limited by the friction between the tires and the asphalt we can qual newtons 2nd law to the force of the friction and the mass of the vehicle will divide out:
m a = -N u
With: N= m g
Follows m a=-m g u
Divide by m: a=-g u
Here being:
m: mass of the vehicle
a: acceleration of the vehicle
N: normal force of the vehicle on the ground
g: gravitational acceleration of earth
u: friction coefficient in between tires and asphalt
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That the braking distance is the same for every amount of mass added to the car makes absolute sense. As we assume that the maximum negative acceleration during braking is limited by the friction between the tires and the asphalt we can qual newtons 2nd law to the force of the friction and the mass of the vehicle will divide out:
m a = -N u
With: N= m g
Follows m a=-m g u
Divide by m: a=-g u
Here being:
m: mass of the vehicle
a: acceleration of the vehicle
N: normal force of the vehicle on the ground
g: gravitational acceleration of earth
u: friction coefficient in between tires and asphalt
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Ruslan
I graduated from automotive uni. I don t remember the formula for the braking distance, but I do remember that there is no mass in it: which means in theory weight of the car doesn t affect breaking distance. Which was proved by this experiment.
This makes sense as the more weight is on a wheel - the more breaking power can be taken from it.
In reality though, a lorry and a Ferrari will obviously stop with a different breaking distance. The reason for that is different brake mechanisms with different efficiency.
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I graduated from automotive uni. I don t remember the formula for the braking distance, but I do remember that there is no mass in it: which means in theory weight of the car doesn t affect breaking distance. Which was proved by this experiment.
This makes sense as the more weight is on a wheel - the more breaking power can be taken from it.
In reality though, a lorry and a Ferrari will obviously stop with a different breaking distance. The reason for that is different brake mechanisms with different efficiency.
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GraveUypo
6: 16 seriously, who devised that? can't be anyone very smart. you're pretty much just testing economy against drag. the only difference it'll make is because it's a slight corner and that puts up some resistance. to test against weight you need to be braking and accelerating constantly like in city traffic. weight makes it harder to get to speed, not to maintain it.
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6: 16 seriously, who devised that? can't be anyone very smart. you're pretty much just testing economy against drag. the only difference it'll make is because it's a slight corner and that puts up some resistance. to test against weight you need to be braking and accelerating constantly like in city traffic. weight makes it harder to get to speed, not to maintain it.
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Anthony
We used to have an Austin Montego estate 1. 6 back in the 80s. 86hp, 0-60 about 12s and a kerb wt of 1075kg, so not far off this Jogger. I'd love to see how the Montego performs, but good luck finding one. we take power and stability so much for granted these days, but we still dealt with it back in the day, many family holidays, was a true workhorse of a car.
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We used to have an Austin Montego estate 1. 6 back in the 80s. 86hp, 0-60 about 12s and a kerb wt of 1075kg, so not far off this Jogger. I'd love to see how the Montego performs, but good luck finding one. we take power and stability so much for granted these days, but we still dealt with it back in the day, many family holidays, was a true workhorse of a car.
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Joseph
I liked this video a lot. What this video also proves is why it's not such a good idea to put rather small engines in a car for lots of passengers. We need 2. 0 litre engines back in all cars like in the past. I hope you do this same test with the hybrid automatic Dacia Jogger when it goes on sale in 2023 Mat.
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I liked this video a lot. What this video also proves is why it's not such a good idea to put rather small engines in a car for lots of passengers. We need 2. 0 litre engines back in all cars like in the past. I hope you do this same test with the hybrid automatic Dacia Jogger when it goes on sale in 2023 Mat.
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Claudiu
I know you tried to simulate a worst case scenario with 1, 967kg but realistic I think the maximum weight is like 1, 750kg in the cars life because a child is not as heavy as an adult and no one will put 200kg in the boot and 7 people at the same time. With that in mind, 3. 6 sec to 60mph is not bad at all.
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I know you tried to simulate a worst case scenario with 1, 967kg but realistic I think the maximum weight is like 1, 750kg in the cars life because a child is not as heavy as an adult and no one will put 200kg in the boot and 7 people at the same time. With that in mind, 3. 6 sec to 60mph is not bad at all.
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WildReefer
Hard not to be impressed by that little engine to be honest.
An important car I think, and I'm glad that it exists - even if I have no use for one personally. I'm sure that there are large families out there with a limited budget that would be very happy with a car like this.
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Hard not to be impressed by that little engine to be honest.
An important car I think, and I'm glad that it exists - even if I have no use for one personally. I'm sure that there are large families out there with a limited budget that would be very happy with a car like this.
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presterjohn71
This video reflects our yearly family trip to Padstow in Cornwall. We have a Zafira as our load lugger for family trips. It's brilliant for packing in people and stuff but good grief it really doesn't like those hilly roads when fully loaded.
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This video reflects our yearly family trip to Padstow in Cornwall. We have a Zafira as our load lugger for family trips. It's brilliant for packing in people and stuff but good grief it really doesn't like those hilly roads when fully loaded.
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Darren
Sorry, how is the braking distance not affected! Was Matt simply stamping on the brakes harder each time? Or is the measuring gear not working correctly?
A difference of almost 700kgs and nothing changed! Something is definitely not right there
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Sorry, how is the braking distance not affected! Was Matt simply stamping on the brakes harder each time? Or is the measuring gear not working correctly?
A difference of almost 700kgs and nothing changed! Something is definitely not right there
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LaBogdi
I had a Toyota Hillux 2. 5 diesel, 5 people in it and the skiing gear, struggled up on a pretty steep climb on dry tarmac. Honda civic IX tourer: every time I used the clutch on steep climb, I got the smell. So I'm impressed with the Dacia.
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I had a Toyota Hillux 2. 5 diesel, 5 people in it and the skiing gear, struggled up on a pretty steep climb on dry tarmac. Honda civic IX tourer: every time I used the clutch on steep climb, I got the smell. So I'm impressed with the Dacia.
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Atef
Wow I'm really surprised and impressed. Basically a 50% weight increase only added 24% to the 0-60 time and no effect on the braking distance!
Like the previous comment I would really love to see the same done in a high performance car!
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Wow I'm really surprised and impressed. Basically a 50% weight increase only added 24% to the 0-60 time and no effect on the braking distance!
Like the previous comment I would really love to see the same done in a high performance car!
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Stijn
That braking must be a safety thing (braking too quickly can be dangerous as well) nonetheless very interesting video! more consumption tests are wanted. also that max. weight on incline should be a test/value number that every car has.
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That braking must be a safety thing (braking too quickly can be dangerous as well) nonetheless very interesting video! more consumption tests are wanted. also that max. weight on incline should be a test/value number that every car has.
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kundall
Good job Dacia! We are talking about the cheapest 7 seater with additional 700+ kg from a 1. 0 L engine in 3 cylinder. The performance per cost is impressive. You have a car with all the tech you need to carry stuff from A - B cheap.
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Good job Dacia! We are talking about the cheapest 7 seater with additional 700+ kg from a 1. 0 L engine in 3 cylinder. The performance per cost is impressive. You have a car with all the tech you need to carry stuff from A - B cheap.
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