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Racing Calculators:
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| ¼ Mile Horsepower Calculator | |||||
| MPH | Weight |
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HP |
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| Enter the MPH and Weight and Click on Calculate... | |||||
| HP = Weight * (MPH / 234) ^3 | |||||
| ¼ Mile ET & MPH Calculator #1 | |||||
| Weight | HP |
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ET | MPH |
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| Enter the Weight and HP and Click on Calculate twice... | |||||
| MPH = 234 * (HP / Weight) ^ .3333 ET = 1353 / MPH | |||||
| ¼ Mile ET & MPH Calculator #2 | |||
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MPH |
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| Enter the ET or MPH and Click on Calculate... | |||
| ET = 1353 / MPH MPH = 1353 / ET | |||
| ¼ Mile ET & 1/8 Mile ET Conversions | |||
| ¼ Mile ET |
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1/8 Mile ET |
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| Enter the ¼ Mile ET or the 1/8 Mile ET
and Click on Calculate... | |||
| ¼ Mile ET = (1/8 Mile ET + .22) /
.655 1/8 Mile ET = (¼ Mile ET * .655) - .22 | |||
| % Converter Slip Calculator | ||||||
| RPM | Tire Height | Rearend Ratio | Trans Ratio | MPH |
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Conv Slip% |
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| Enter the RPM, Tire Height in
inches, The Rearend Gear Ratio, the MPH, the Transmission top gear ratio and Click on Calculate... | ||||||
| Conv Slip% = [((RPM * Tire Height) / (Rearend Ratio * Trans Ratio * MPH * 336)) -1] * 100 | ||||||
| ¼ Mile MPH Calculator | ||||||
| Tire Height | Rearend Ratio | RPM | Trans Ratio | Conv Slip% |
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MPH |
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| Enter the Tire Height in inches, The Rearend Gear Ratio, the RPM, the Transmission top gear ratio, Conv Slip% and Click on Calculate... | ||||||
| MPH = (RPM * Tire Height) / (Rearend Ratio * 336.136 * Trans Ratio * Conv Slip%) | ||||||
| Optimum Rearend Ratio Calculator | ||||||
| Tire Height | MPH | RPM | Trans Ratio | Conv Slip% |
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Rearend Ratio |
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| Enter the Tire Height in inches, The ¼ Mile MPH, the RPM, the Transmission top gear ratio Conv Slip% and Click on Calculate... | ||||||
| Rearend Ratio = (RPM * Tire Height) / MPH * 336.136 * Trans Ratio * Conv Slip%) | ||||||
| ¼ Mile RPM Calculator | ||||||
| Tire Height | Rearend Ratio | MPH | Trans Ratio | Conv Slip% |
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RPM |
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| Enter the Tire Height in inches, The Rearend Gear Ratio, the ¼ Mile MPH, the Transmission top gear ratio Conv Slip% and Click on Calculate... | ||||||
| RPM = (Rearend Ratio * MPH * 336.136 * Trans Ratio * Conv Slip%) / Tire Height | ||||||
| Optimum Tire Height Calculator | ||||||
| Rearend Ratio | MPH | RPM | Trans Ratio | Conv Slip% |
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Tire Height |
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| Enter the Rearend Gear Ratio, the ¼ Mile
MPH, the RPM, the Transmission top gear ratio, Conv Slip% and Click on Calculate... | ||||||
| Tire Height = (Rearend Ratio * MPH * 336.136 * Trans Ratio * Conv Slip%) / RPM | ||||||
| Engine Displacement Calculator | |||||
| Bore | Stroke | # of Cylinders |
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Displacement |
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| Enter the Bore in inches, the stroke in
inches, the number of cylinders, and Click on Calculate... | |||||
| Displacement = (Bore / 2) ^2 * PI * Stroke * # of cylinders | |||||
| Tire Height & Width Calculator | |||||
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Tire
Width (mm) |
Aspect Ratio (1-100) |
Wheel Diameter (in) |
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Tire
Height (in) |
Tire
Width (in) |
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| Enter the tire width in millimeters, the
aspect ratio, the wheel diameter in inches, and Click on Calculate... | |||||
| Tire Height(in) = (Width(mm) / 25.4 *
Aspect Ratio / 100 * 2) + Wheel diameter Tire Width(in) = Width(mm) / 25.4 | |||||
| Tire Width & Aspect Ratio Calculator | |||||
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Tire
Height (in) |
Tire
Width (in) |
Wheel Diameter (in) |
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Tire
Width (mm) |
Aspect Ratio (1-100) |
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| Enter the tire height in inches, the tire
width in inches, the wheel diameter in inches, and Click on Calculate... | |||||
| Tire Width(mm) = Tire Width(in) *
25.4 Aspect Ratio = (Tire Height - Wheel Diameter) / 2 / Tire Width * 100 | |||||
| Effective & Equivalent Gear Ratio Calculator | ||||||
| New Tire Height | Old Tire Height | Original Ratio |
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Effective Ratio | Equivalent Ratio |
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| Enter the New tire height, Old tire
height, and the original rear gear ratio. Click on Calculate... | ||||||
| Effective Ratio = (Old tire height / New tire height) * Original ratio | ||||||
| Equivalent Ratio = (New tire height / Old tire height) * Original ratio | ||||||
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Engine Air Capacity & Carburetor
Size Calculator (normally aspirated) | ||||||
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Displacement (in3) |
Max. RPM |
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Theoretical Capacity CFM |
Street Carb. Size CFM |
Racing Carb. Size CFM |
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| Enter the engine size and maximum
RPM Click on Calculate... | ||||||
| Theoretical CFM = (Displacement * RPM) /
3456 Street Carb. CFM = ((Displacement * RPM) / 3456) * 0.85 Race Carb. CFM = ((Displacement * RPM) / 3456) * 1.1 | ||||||