Originally posted by Tsunami And just for kicks, heres a thought: does a beefier front anti-sway bar cause understeer or oversteer? understeer because it increases the contact patch on the front wheels. A beefier rear sway bar will increase the contact patch of the rear wheels, (and increase its mass), thus increasing its rotational ability. More contact = less grip?? :p: Maybe some vehicle dynamics courses are in order... and oregano.. man... you need to spend more time in school. constant speed moving in a circle the car's weight distribution duz not technicaly affect handling :D ...damn, I guess weight distribution duz matter... |
agreed, weight in front does not better the handling of a car. if this were true 50/50 weight distribution would not be a goal of any sports car manufacturers. Car manufacturers only strive for 50/50 weight distribution if they're producing a RWD. You will never find a FWD w/ its entire engine and transaxle any where close to the firewall like a RWD. You might ask what the difference is. Imagine a RWD w/ most of its weight up front. This is a terrible setup becuase: 1) when you enter a turn, you let your foot off the gas pedal and brake. The weight of the car transfers further up front, which can easily initiate a drift. 2) after you initiate the drift, you can not steer the car w/ your gas becuase you have no weight at the back. This is fine on a FWD, becuase the drive wheels are up front. And just for kicks, heres a thought: does a beefier front anti-sway bar cause understeer or oversteer? understeer because it increases the contact patch on the front wheels. A beefier rear sway bar will increase the contact patch of the rear wheels, (and increase its mass), thus increasing its rotational ability. howi |
Why are cars FWD in the first place? Because they are better in bad weather because more weight is over the driving wheels.
So why would a car company try to put more of the weight in the back, it might perform better, but since when is FWD a performance option? |
FWD aint no performance option, its a COST option, always has been always will be.
Nothing to do with bad wether traction? :confused: |
Now whats that thing called when you go round a circle... I think you were talking about the imaginary force that is opposite to it (hard to tell due to the spelling ) ...right, centripital force... which means that when you are going around a circle, you are accelerating.... ...damn, I guess weight distribution duz matter... so you need acceleration to keep it going at a constant speed... it's obvious becuase F=mv^2/r. so what? how did you jump to that conclusion? howi |
preludes are slow? Man, someone better tell that to the people I autocross with, because preludes almost allways take the top 2 or 3 spots...
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First of all...
The prelude is overweight. Secondly... I really don't beleive that you can have a true sports car unless it is RWD. Thirdly... You can make a Honda faster than hell but it is still a FWD economy car (with the exception of the S2000, my friends dad has one and it hits 140 mph with ease). Fourthly... VTEC (Variable Timing Electronic Control) is amazing engineering and every car company has tried to copy it. Lastly... Mazda's Kick Ass... |
Why are cars FWD in the first place? Because they are better in bad weather because more weight is over the driving wheels. So why would a car company try to put more of the weight in the back, it might perform better, but since when is FWD a performance option? I'm with White FC. what are you talking about BDoty311? |
Originally posted by autocrash dude... most of what you said is true... and I agree with the results of the above situation... but think about it... More contact = less grip?? :duz matter... |
Lots of people are scared of RWD in the snow and rain, so they want a FWD car that will do better in bad weather. Thats one reason why FWD cars are more popular.
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Originally posted by Howi Please englighten me as I do not see how an sway bar can increase the contact patch. I believe that the reason why you can increase oversteer by adding a rear sway bar at the back is because the weight transfer will be much quick (similar effect to stiffening up the springs the back of the car), therefore the rear-end will come out much easier. howi also: inheirently in their design tansversely mounted motors cannot be mounted close to the firewall, as there would be no way to access the intake manifold or any of the sensors in the back, while that problem does not exist with a longitudianlly mounted engine because both manifolds and sensors are on the sides, thus can be planted as close as possible to the firewall. A transversely mounted motor cannot be mounted closer to the firewall as then the axles, hubs, and the entire front suspension would be moved further back, giving the car a much shorter wheelbase and thus crappyer handling. also: Less weight and stiffer springs out back may be perfectly fine for (attempted) fwd drifting and ebrake driving, or for rally driving, as in those conditions it is beneficial for the rear end to sway outside of the front end, while in GRIP racing, it seems much more beneficial to maintain mass in the rear in order to allow the centrifugal force exterted (or seemingly exerted on it, as centrifugal force is an imaginary force) on the rear to aid the car in rotation. It is certainly possible that this weight and centrifugal force is negligible compared to a well tuned suspension, but it makes far more sense to keep it there than to remove it IMO. |
Re: Re: racing question
Originally posted by MtnRacer In addition to the weight issue already described, your car can also wind out gears longer than other cars. This saves you the time of shifting, but it's negligable when you hit third and he has more power. Steve |
Originally posted by mason-rx-7 I really don't beleive that you can have a true sports car unless it is RWD. Lastly... Mazda's Kick Ass... |
Originally posted by Howi You might ask what the difference is. Imagine a RWD w/ most of its weight up front. This is a terrible setup becuase: 1) when you enter a turn, you let your foot off the gas pedal and brake. The weight of the car transfers further up front, which can easily initiate a drift. 2) after you initiate the drift, you can not steer the car w/ your gas becuase you have no weight at the back. howi |
I never said more contact = less grip. A beefier rear sway bar will increase the contact patch of the rear wheels, (and increase its mass), thus increasing its rotational ability. amen brother. no matter how fast your hon-duh might be, its still a fwd economy car. they never have been, never can be, and never will be true sports cars. so even if one beats you just chew on that. howi |
2000 z06 vette as reported by car and driver
53.5/46.5% |
Originally posted by Howi Yes you did, just not in the exact words, here: How about instead of trying to catch me in some sort of imaginary slip up, you accept my post for what it was, an informative post that was correcting misconceptions of a fellow Rx7club member. |
Originally posted by Tsunami 2000 z06 vette as reported by car and driver 53.5/46.5% |
Originally posted by andrew lohaus and let me tell you they can sling the rear out like its nobody's buisness. |
Originally posted by x2delight i totally agree.. my friend has a 2000 Prelude and i love it when his vtec kicks in... |
technically you are right, but insted of stirring up trouble lets just say 'kicking in' = switching to high rpm lobes. ;)
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an anti-sway bar works by tying the bottoms of the suspension pieces together, which in turn lessens body roll and keeps both wheels better planted on the ground, this in turn keeps weight and mass from transfering to the outside when it experiences centrifugal force, thus it doesnt really increase the contact patch, but it keeps the patch planted more firmly on the ground, and keeping more weight over it, thus increasing traction. also: inheirently in their design tansversely mounted motors cannot be mounted close to the firewall, as there would be no way to access the intake manifold or any of the sensors in the back, while that problem does not exist with a longitudianlly mounted engine because both manifolds and sensors are on the sides, thus can be planted as close as possible to the firewall. A transversely mounted motor cannot be mounted closer to the firewall as then the axles, hubs, and the entire front suspension would be moved further back, giving the car a much shorter wheelbase and thus crappyer handling. also: Less weight and stiffer springs out back may be perfectly fine for (attempted) fwd drifting and ebrake driving, or for rally driving, as in those conditions it is beneficial for the rear end to sway outside of the front end This is what Oregano and I have trying to say the WHOLE time!!! And that is if you put more weight in the front of a FWD, the rear-end will come out easier!! Here's a quote from Oregano: a car with more mass at the front will understeer less under acceleration, and oversteer more under deceleration, when compared to a car with 50/50 weight distribution |
Originally posted by Howi thanks for clearing things up. I disagree. You can put an engine in a FWD w/ its exhaust ports facing the rear of the car, and the O2 sensor on the down pipe. This has been done. I disagree again. If you have opened up an transaxle, you would know that the you can design the intermediate shaft to rotate about the input shaft at any angle, and rotate the final fing gear and differential can rotate about the intermediate shaft at any angle. The engine can move back and forth in the engine bay quite a bit without sacrificing wheelbase. :eek: This is what Oregano and I have trying to say the WHOLE time!!! And that is if you put more weight in the front of a FWD, the rear-end will come out easier!! Here's a quote from Oregano: Howi Pulling the Ebrake during a turn does not = oversteer, nor does punching the breaks on a dirt course to get the rear come out. I assumed through all the talk of friction and traction that we were talking about grip racing. I believed that we were talking about oversteer/rotation in a grip situation, and as we all hopefully know it is not beneficial to lock up and slide your rear wheels while grip racing. Edit: discontinuing, see my previous post. It explains very logically and clearly. |
"agreed, weight in front does not better the handling of a car" Tsunami
no, it wont. but it will make a FWD car faster. i have experienced it first hand for 2 years and taken the time to draw vector diagrams showing weight transfer on cars of dif. weight distributions. have u? "The more mass in the front of the car when turning, the more inertia it will have and thus cause a greater force to move the front in a straightline, which will contribute to an understeer situation" Tsunami Which is exactly what i said, except u left out the part about how the increased mass increases downward force and thus increases friction(traction). these two forces(centrifugal/frictional) increase/decrease linearly at the same rate. ex. 500kg car at 1g of lateral acceleration, with u(friction constant) of x, generates (500*9.8)Newtons of centrifugal force, and (500*9.8*x)Newtons of frictional force. Double the weight, and u can see that the cent. force doubles, as duz the frictional force. Now, we can apply this same method of thinking to weight distribution by dividing the car into 2 axles of different masses. treating each axle as a seperate body. increase the mass of one, and at the same time u will increase its traction proportionally. "Centrifugal force DECREASES the amount of weight (and mass, in case of body roll) over the frictional service, thus causing a loss of friction (and traction)." Weight is mass*g. mass duz not dissapear. neither duz gravity. unless the centrifugal force acts upward, it cant decrease the effective weight on the wheels. weight transfer decreases/increases effective weight by acting up/down on the end of the car. the centrifugal force duz not change for a given mass however, since weight transfer duz not affect mass. "And just for kicks, heres a thought: does a beefier front anti-sway bar cause understeer or oversteer? understeer because it increases the contact patch on the front wheels. A beefier rear sway bar will increase the contact patch of the rear wheels, (and increase its mass), thus increasing its rotational ability." A beefier front sway bar helps transfer weight to the rear of the car, thus increasing friction at the rear of the car, thus causing understeer. I hope i have cleared up any misconceptions u may have had about mass dissapearing or centrifugal force acting in a perpendicular direction to the plane of travel. WERD. |
"Pulling the Ebrake during a turn does not = oversteer"
yes it duz. plz try and tell us otherwise. |
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