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Speed/RPM Calculator
This calculator will give you a table of your speed in mph per rpm in
each gear. The default is for the Impreza 2.5 RS. Fill in
your specs to get a custom table. A factor of 0.965 was used
to account for the reduced tire diameter caused by numerous factors (see
below). Every tire will be slightly different,
so these numbers are purely estimates. It's impossible to calculate a
precise value.
|
1 |
2 |
3 |
4 |
5 |
0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
|
|
500 |
2.8 |
4.9 |
7.0 |
9.8 |
12.9 |
|
|
1000 |
5.5 |
9.8 |
14.0 |
19.7 |
25.9 |
|
|
1500 |
8.3 |
14.7 |
21.0 |
29.5 |
38.8 |
|
|
2000 |
11.1 |
19.6 |
28.0 |
39.3 |
51.8 |
|
|
2500 |
13.8 |
24.5 |
35.0 |
49.1 |
64.7 |
|
|
3000 |
16.6 |
29.4 |
42.0 |
59.0 |
77.6 |
|
|
3500 |
19.4 |
34.3 |
48.9 |
68.8 |
90.6 |
|
|
4000 |
22.1 |
39.2 |
55.9 |
78.6 |
103.5 |
|
|
4500 |
24.9 |
44.1 |
62.9 |
88.4 |
116.5 |
|
|
5000 |
27.7 |
49.1 |
69.9 |
98.3 |
129.4 |
|
|
5500 |
30.4 |
54.0 |
76.9 |
108.1 |
142.4 |
|
|
6000 |
33.2 |
58.9 |
83.9 |
117.9 |
155.3 |
|
|
6500
redline |
35.9 |
63.8 |
90.9 |
127.7 |
168.2 |
|
|
Why isn't it perfectly accurate?
There are far too many factors that affect a car's velocity to be
reasonably considered in this table. Barometric pressure and altitude
all contribute to a variable air pressure that affects the external pressure
on the tire, reducing its size and reducing the vehicle's velocity.
The tire size is also affected by other factors like temperature, humidity,
car weight, car weight distribution, weight shifting caused by acceleration,
and rotational speed (centrifugal force). Gravitational forces from
the earth, moon, and sun also affect the pressure on the tire and its size.
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