DarthVader1933
New member
é
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Puxar versus Empurrar (ou Tracçao Traseira vs Dianteira)
- Iniciador de tópicos 330i
- Data de início
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330i
Well-known member
lol, eu quando era puto pensava que os RWDs eram perigosos e que os FWDs soltavam muito a traseira [
vias muitas provas de pericia (!!!)
[
] [] [] [] [] estou a brincar..
330i
Well-known member
pois eu tambem, vim pela mesma razao....... se calhar é melhor deitar aqui uma "bomba" e voltar amanha (!)[
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330i
Well-known member
pois eu tambem, vim pela mesma razao....... se calhar é melhor deitar aqui uma "bomba" e voltar amanha (!)[
tal como no inicio do topico; até a melhor industria italiana deixou de fabricar automoveis, e virou-se para as carroças (queria dizer arrastadeiras, ou melhor tracçao á frente)
que saudades dos 124 spyder/131 Abarth/Guiullieta 1300/1600/1750/2000/Gts Gta etc etc.............
Frecciarossa23
New member
Podemos ler na Wikipedia:
"Rear wheel drive has fallen out of favor in passenger cars since the 1980s[citation needed], due in part to higher manufacturing costs, and that front wheel drive is safer to drive[1], and that it performs better on slippery roads.[2][3] However, some automobile brands, including Cadillac, Mercedes-Benz, BMW and Porsche continue to use rear wheel drive platforms. Rear wheel drive (or all-wheel drive) is still the preferred choice for high performance automobiles, due to the fact that very powerful front wheel drive cars tend to understeer.[4] The general limit of controllable power for a front wheel drive car is generally placed between 230 and 300 horsepower."
Espero q todos percebam mais ou menos o inglês.
"Rear wheel drive has fallen out of favor in passenger cars since the 1980s[citation needed], due in part to higher manufacturing costs, and that front wheel drive is safer to drive[1], and that it performs better on slippery roads.[2][3] However, some automobile brands, including Cadillac, Mercedes-Benz, BMW and Porsche continue to use rear wheel drive platforms. Rear wheel drive (or all-wheel drive) is still the preferred choice for high performance automobiles, due to the fact that very powerful front wheel drive cars tend to understeer.[4] The general limit of controllable power for a front wheel drive car is generally placed between 230 and 300 horsepower."
Espero q todos percebam mais ou menos o inglês.
Frecciarossa23
New member
Vantagens:
"* Even weight distribution - The layout of a rear wheel drive car is much closer to an even fore and aft weight distribution than a front wheel drive car, as more of the engine can lie between the front and rear wheels (in the case of a mid engine layout, the entire engine), and the transmission is moved much farther back.[5]
* Weight transfer during acceleration - During heavy acceleration, weight is placed on the rear, or driving wheels, which improves traction.
* No torque steer[4] (unless it's an all wheel steer with an offset differential).
* Steering radius - As no complicated drive shaft joints are required at the front wheels, it is possible to turn them further than would be possible using front wheel drive, resulting in a smaller steering radius for a given wheelbase.
* Better handling in dry conditions - the more even weight distribution and weight transfer improve the handling of the car. The front and rear tires are placed under more even loads, which allows for more grip while cornering.[1]
* Better braking - the more even weight distribution helps prevent lockup from wheels becoming unloaded under heavy braking.[1]
* Towing - Rear wheel drive puts the wheels which are pulling the load closer to the point where a trailer articulates, helping steering, especially for large loads.[1]
* Serviceability - Drivetrain components on a rear-wheel drive vehicle are modular and do not involve packing as many parts into as small a space as does front wheel drive, thus requiring less disassembly or specialized tools in order perform servicing.[citation needed]
* Robustness - due to geometry and packaging constraints, the CV joints attached to the wheel hub have a tendency to wear out much earlier than the universal joints typically used in their rear-wheel drive counterparts. The significantly shorter drive axles on a front-wheel drive car causes the joint to flex through a much wider degree of motion, compounded by additional stress and angles of steering, while the CV joints of a rear wheel drive car regularly see angles and wear of less than half that of front wheel drive vehicles.[citation needed]"
"* Even weight distribution - The layout of a rear wheel drive car is much closer to an even fore and aft weight distribution than a front wheel drive car, as more of the engine can lie between the front and rear wheels (in the case of a mid engine layout, the entire engine), and the transmission is moved much farther back.[5]
* Weight transfer during acceleration - During heavy acceleration, weight is placed on the rear, or driving wheels, which improves traction.
* No torque steer[4] (unless it's an all wheel steer with an offset differential).
* Steering radius - As no complicated drive shaft joints are required at the front wheels, it is possible to turn them further than would be possible using front wheel drive, resulting in a smaller steering radius for a given wheelbase.
* Better handling in dry conditions - the more even weight distribution and weight transfer improve the handling of the car. The front and rear tires are placed under more even loads, which allows for more grip while cornering.[1]
* Better braking - the more even weight distribution helps prevent lockup from wheels becoming unloaded under heavy braking.[1]
* Towing - Rear wheel drive puts the wheels which are pulling the load closer to the point where a trailer articulates, helping steering, especially for large loads.[1]
* Serviceability - Drivetrain components on a rear-wheel drive vehicle are modular and do not involve packing as many parts into as small a space as does front wheel drive, thus requiring less disassembly or specialized tools in order perform servicing.[citation needed]
* Robustness - due to geometry and packaging constraints, the CV joints attached to the wheel hub have a tendency to wear out much earlier than the universal joints typically used in their rear-wheel drive counterparts. The significantly shorter drive axles on a front-wheel drive car causes the joint to flex through a much wider degree of motion, compounded by additional stress and angles of steering, while the CV joints of a rear wheel drive car regularly see angles and wear of less than half that of front wheel drive vehicles.[citation needed]"
Frecciarossa23
New member
Desvantagens:
"* Oversteer and the related problem of fishtailing.
* On snow, ice and sand, rear-wheel drive loses its traction advantage to front or all-wheel drive vehicles which have greater weight on the driven wheels. Rear wheel drive cars with rear engine or mid engine configuration do not suffer from this, although fishtailing remains an issue.
* Some rear engine cars (e.g. Porsche 911) can suffer from reduced steering ability under heavy acceleration, because the engine is outside the wheelbase and at the opposite end of the car from the wheels doing the steering.
* Decreased interior space - In a passenger car, rear wheel drive means: Less front leg room as the transmission tunnel takes up a space between the driver and front passenger, less leg room for center rear passengers (due to the tunnel needed for the drive shaft), and sometimes less trunk space (since there is also more hardware that must be placed underneath the trunk). There are some exceptions to this as rear engine designs do not take away interior space. (See Porsche 911, and Volkswagen Beetle)
* Increased weight - The components of a rear wheel drive vehicle's power train are less complex, but they are larger. The driveshaft adds weight. There is extra sheet metal to form the transmission tunnel. There is a rear axle or rear half-shafts, which are typically longer than those in a front-wheel drive car. A rear wheel drive car will weigh slightly more than a comparable front wheel drive car (but less than four wheel drive).
* Improper weight distribution when loaded - A rear wheel drive car's center of gravity is shifted rearward when heavily loaded with passengers or cargo, which may cause unpredictable handling behavior.[2]
* Higher initial purchase price - Probably due to more complex assembly (the powertrain is not one compact unit) and added cost of materials, rear wheel drive is typically slightly more expensive to purchase than a comparable front wheel drive vehicle. This might also be explained by production volumes, or the fact that the majority of rear-wheel cars are in the sports/performance/luxury categories. Few "family" sedans have rear-wheel drive, so a cost comparison is not necessarily possible.[citation needed]
* The possibility of a slight loss in the mechanical efficiency of the drivetrain (approximately 17% coastdown losses between engine flywheel and road wheels compared to 15% for front wheel drive - these losses are highly dependent on the individual transmission, and the source should be cited). Cars with rear engine or mid engine configuration and a transverse engine layout do not suffer from this.
* The long driveshaft (on FR cars) adds to drivetrain elasticity.[2]"
"* Oversteer and the related problem of fishtailing.
* On snow, ice and sand, rear-wheel drive loses its traction advantage to front or all-wheel drive vehicles which have greater weight on the driven wheels. Rear wheel drive cars with rear engine or mid engine configuration do not suffer from this, although fishtailing remains an issue.
* Some rear engine cars (e.g. Porsche 911) can suffer from reduced steering ability under heavy acceleration, because the engine is outside the wheelbase and at the opposite end of the car from the wheels doing the steering.
* Decreased interior space - In a passenger car, rear wheel drive means: Less front leg room as the transmission tunnel takes up a space between the driver and front passenger, less leg room for center rear passengers (due to the tunnel needed for the drive shaft), and sometimes less trunk space (since there is also more hardware that must be placed underneath the trunk). There are some exceptions to this as rear engine designs do not take away interior space. (See Porsche 911, and Volkswagen Beetle)
* Increased weight - The components of a rear wheel drive vehicle's power train are less complex, but they are larger. The driveshaft adds weight. There is extra sheet metal to form the transmission tunnel. There is a rear axle or rear half-shafts, which are typically longer than those in a front-wheel drive car. A rear wheel drive car will weigh slightly more than a comparable front wheel drive car (but less than four wheel drive).
* Improper weight distribution when loaded - A rear wheel drive car's center of gravity is shifted rearward when heavily loaded with passengers or cargo, which may cause unpredictable handling behavior.[2]
* Higher initial purchase price - Probably due to more complex assembly (the powertrain is not one compact unit) and added cost of materials, rear wheel drive is typically slightly more expensive to purchase than a comparable front wheel drive vehicle. This might also be explained by production volumes, or the fact that the majority of rear-wheel cars are in the sports/performance/luxury categories. Few "family" sedans have rear-wheel drive, so a cost comparison is not necessarily possible.[citation needed]
* The possibility of a slight loss in the mechanical efficiency of the drivetrain (approximately 17% coastdown losses between engine flywheel and road wheels compared to 15% for front wheel drive - these losses are highly dependent on the individual transmission, and the source should be cited). Cars with rear engine or mid engine configuration and a transverse engine layout do not suffer from this.
* The long driveshaft (on FR cars) adds to drivetrain elasticity.[2]"
330i
Well-known member
se estivessemos em Inglaterra seria um post interessante (!) agora como nao estamos.... , podias traduzi-lo e continuarmos a falar portugues???
can you translate...please!
Frecciarossa23
New member
Não leves a mal, mas n tenho muita paciência para traduções, de qq maneira faz copy\paste do texto e vai ao site dictionary.com, ele traduz-te o texto todo, mesmo q algumas partes da frase fiquem um pouco parvas dá para perceberes sem problemas.
330i
Well-known member
podias te-lo feito logo de inicio, eu ja-o traduzi.
voabaixinho
New member
I´ve already wrote that in the post number 208... erhh... perdão...
Eu já tinha escrito isso no post nº 208. Nem melhor nem pior diferente.
Se, à excepção de alguns, mais ninguém quiser ver isso... vai haver sangue... [][][]
Eu já tinha escrito isso no post nº 208. Nem melhor nem pior diferente.
Se, à excepção de alguns, mais ninguém quiser ver isso... vai haver sangue... [
][][]
Eliselotus
Well-known member
nem mais!Normalmente quando há uns chuviscos na autoestrada os primeiros carros que costumo ver a rodopiar são BMW's ..... de tracção traseira ...
...... lagarto, lagarto ,.....:sh)
ficando assim comprovado que os BMW sao PESSIMOS!
isto apesar de, em paises onde NEVA E CHOVE com mutio mais intensidade que em portugal, haver gente que usa PORSCHES no dia a dia, BMWs com BEM MAIS de 250cv, etc.....e sem pontinha de problema!!!
serao maquinas ao volante? humanos com dotes sobrenaturais? serao os carros diferentes nesses paises?
eu acho que tem tudo a ver com o que esta entre o volante e o banco, mas e uma teoria que nao esta na moda.
para um condutor irresponsavel, qualquer carro serve para matar uns quantos. yep, e perigoso mesmo que seja FWD ou 4wd, com 10ESPs maravilha, 20ABSs, com 50cv para 5toneladas.
PedroROF
New member
Por acaso pensei um bocado naquilo que disseste e depois fiz umas sandes...
Daquelas com pão de forma, e no meio meti uma sardinha e mais um bocado
de atum. Fiquei com sede e bebi um bocado de Jói laranga, não sei se era
mesmo Jói ou se era da marca modelo, uma vez que o Modelo acho que está
12 paus mais barato! Depois meti para o lixo o arroz que tinha feito ao
jantar, lavei os dentes e vim até ao Pc! (Só achei que gostassem que eu
partilhasse isto! ![
] Agora a falar a sério:
Eu aposto numa maquina ao volante, assim tipo aquele robot que lutava com o
robocop e que era viciado em Nuke, eu até me atrevo a dizer que calcula em
microminesimos de segundos antes a correcção a fazer a um carro quando foge...
Incrivel.[
]Psst não passem a palavra senão ainda se torna mito, e não me apetece
andar por aí com medo de um robot desses...
Última edição:
Aqui está um pequeno comparativo entre os vários tipos de tracção! O último teste não deixa grandes dúvidas sobre o comportamento de cada tipo em curva!
http://youtube.com/watch?v=K9TJecSuwIY
Ps: Espero que ainda não tenha sido postado este video, senão ignorem...
http://youtube.com/watch?v=K9TJecSuwIY
Ps: Espero que ainda não tenha sido postado este video, senão ignorem...
330i
Well-known member
Normalmente quando há uns chuviscos na autoestrada os primeiros carros que costumo ver a rodopiar são BMW's ..... de tracção traseira ...
...... lagarto, lagarto ,.....:sh)
pois..........
e Mercedes, e Lexus, e Porches e Ferraris e Jaguares, e Aston Martins, e Maseratis, safam-se os 4x4, e mesmo estes...............
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330i
Well-known member
imaginem Portugal com AE,s e IP´s cheios de neve e gelo durante 5 ou 6 meses por ano!!!
quantos mortos por milhar de habitantes?? e com tanto RWD..........BMs e Mercedes á fartazana, era ver as estatisticas!!!
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