Wheel weight, Acceleration and Top speed
12-13-2001, 08:22 AM
#1
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Join Date: Sep 2001
Posts: 1,185
Wheel weight, Acceleration and Top speed
We all know how wheel weight can affect acceleration and top speed i.e the heavier the wheel, the slower the acceleration and lower the top speed. But how can we tell HOW MUCH the effect will be on our cars?
Suppose we were to assume all 3rd, 4th, & 5th generation Maxima’s were stock. Is there a formula that is somewhat mathematically coherent that we could plug in a wheel weight to find the expected corresponding 1/4 mile time and top speed for that generation of Maxima?
Below is some data we need to help estimate the correlation between rim weight and performance:
1: Year?
2: Weight of stock rims?
3: Weight of aftermarket rims?
4: 1/4 miles time w/ stock rims?
5: 1/4 mile time w/aftermarket rims?
6: Top speed w/ stock rims?
7: Top speed w/aftermarket rims?
Does anybody have any of that info for their car? Or any suggestions on how to develop a formula?
Suppose we were to assume all 3rd, 4th, & 5th generation Maxima’s were stock. Is there a formula that is somewhat mathematically coherent that we could plug in a wheel weight to find the expected corresponding 1/4 mile time and top speed for that generation of Maxima?
Below is some data we need to help estimate the correlation between rim weight and performance:
1: Year?
2: Weight of stock rims?
3: Weight of aftermarket rims?
4: 1/4 miles time w/ stock rims?
5: 1/4 mile time w/aftermarket rims?
6: Top speed w/ stock rims?
7: Top speed w/aftermarket rims?
Does anybody have any of that info for their car? Or any suggestions on how to develop a formula?
12-13-2001, 11:06 AM
#2
Senior Member
Join Date: Oct 2000
Posts: 755
F=MA
What you need to know is mass, not weight. For a rotating object you need to know its moment of inertia. This is determined by its mass distribution. Since different wheels/tires have different mass distributions there's no quick/accurate way to model its effect.
Top speed is a steady state condition and mass (weight) has no effect (only how long to get there: acceleration. A first order approximation for calulated top speed depends on Hp at the driven wheel(s) and total aerodynamic drag.
What you need to know is mass, not weight. For a rotating object you need to know its moment of inertia. This is determined by its mass distribution. Since different wheels/tires have different mass distributions there's no quick/accurate way to model its effect.
Top speed is a steady state condition and mass (weight) has no effect (only how long to get there: acceleration. A first order approximation for calulated top speed depends on Hp at the driven wheel(s) and total aerodynamic drag.
12-13-2001, 11:09 AM
#3
Senior Member
Join Date: Oct 2000
Posts: 755
F=MA
What you need to know is mass, not weight. For a rotating object you need to know its moment of inertia. This is determined by its total mass and its distribution. Since different wheels/tires have different mass distributions there's no quick/accurate way to model its effect.
Top speed is a steady state condition and mass (weight) has no effect (only how long to get there: acceleration. A first order approximation for calulated top speed depends on Hp at the driven wheel(s) and total aerodynamic drag.
What you need to know is mass, not weight. For a rotating object you need to know its moment of inertia. This is determined by its total mass and its distribution. Since different wheels/tires have different mass distributions there's no quick/accurate way to model its effect.
Top speed is a steady state condition and mass (weight) has no effect (only how long to get there: acceleration. A first order approximation for calulated top speed depends on Hp at the driven wheel(s) and total aerodynamic drag.
12-13-2001, 11:43 AM
#4
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Thread Starter
Join Date: Sep 2001
Posts: 1,185
Originally posted by brubenstein
F=MA
What you need to know is mass, not weight. For a rotating object you need to know its moment of inertia. This is determined by its total mass and its distribution. Since different wheels/tires have different mass distributions there's no quick/accurate way to model its effect.
Top speed is a steady state condition and mass (weight) has no effect (only how long to get there: acceleration. A first order approximation for calulated top speed depends on Hp at the driven wheel(s) and total aerodynamic drag.
F=MA
What you need to know is mass, not weight. For a rotating object you need to know its moment of inertia. This is determined by its total mass and its distribution. Since different wheels/tires have different mass distributions there's no quick/accurate way to model its effect.
Top speed is a steady state condition and mass (weight) has no effect (only how long to get there: acceleration. A first order approximation for calulated top speed depends on Hp at the driven wheel(s) and total aerodynamic drag.
It is my understanding that top speed is a steady state as you said, but rim weight is considered and external factor, like areodynamic drag, and does have an effect that can be significant to base a calculation on.
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