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Gear Ratio Calculator >>

2008 Ford Mustang Tremec TR-3650 Gear Ratios Calculator, MPH, Top Speed

 


This calculator outputs the how fast the Ford Mustang can go in each gear as calculated by the gear ratios, engine redline and tire size.
The ultimate top speed may be limted by the power, drag and aerodynamics of each individual car.

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Tire Size
(345/30/20)
/ -
OR
Tire Diameter
(inches)
 
Final Drive Ratio
Redline (RPM)
1st Gear
2nd Gear
3rd Gear
4th Gear
5th Gear
6th Gear
7th Gear
8th Gear

RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear 7th Gear 8th Gear
500 0 0 0 0 0 0 0 0
600 0 0 0 0 0 0 0 0
700 0 0 0 0 0 0 0 0
800 0 0 0 0 0 0 0 0
900 0 0 0 0 0 0 0 0
1000 0 0 0 0 0 0 0 0
1100 0 0 0 0 0 0 0 0
1200 0 0 0 0 0 0 0 0
1300 0 0 0 0 0 0 0 0
1400 0 0 0 0 0 0 0 0
1500 0 0 0 0 0 0 0 0
1600 0 0 0 0 0 0 0 0
1700 0 0 0 0 0 0 0 0
1800 0 0 0 0 0 0 0 0
1900 0 0 0 0 0 0 0 0
2000 0 0 0 0 0 0 0 0
2100 0 0 0 0 0 0 0 0
2200 0 0 0 0 0 0 0 0
2300 0 0 0 0 0 0 0 0
2400 0 0 0 0 0 0 0 0
2500 0 0 0 0 0 0 0 0
2600 0 0 0 0 0 0 0 0
2700 0 0 0 0 0 0 0 0
2800 0 0 0 0 0 0 0 0
2900 0 0 0 0 0 0 0 0
3000 0 0 0 0 0 0 0 0
3100 0 0 0 0 0 0 0 0
3200 0 0 0 0 0 0 0 0
3300 0 0 0 0 0 0 0 0
3400 0 0 0 0 0 0 0 0
3500 0 0 0 0 0 0 0 0
3600 0 0 0 0 0 0 0 0
3700 0 0 0 0 0 0 0 0
3800 0 0 0 0 0 0 0 0
3900 0 0 0 0 0 0 0 0
4000 0 0 0 0 0 0 0 0
4100 0 0 0 0 0 0 0 0
4200 0 0 0 0 0 0 0 0
4300 0 0 0 0 0 0 0 0
4400 0 0 0 0 0 0 0 0
4500 0 0 0 0 0 0 0 0
4600 0 0 0 0 0 0 0 0
4700 0 0 0 0 0 0 0 0
4800 0 0 0 0 0 0 0 0
4900 0 0 0 0 0 0 0 0
5000 0 0 0 0 0 0 0 0
5100 0 0 0 0 0 0 0 0
5200 0 0 0 0 0 0 0 0
5300 0 0 0 0 0 0 0 0
5400 0 0 0 0 0 0 0 0
5500 0 0 0 0 0 0 0 0
5600 0 0 0 0 0 0 0 0
5700 0 0 0 0 0 0 0 0
5800 0 0 0 0 0 0 0 0
5900 0 0 0 0 0 0 0 0
6000 0 0 0 0 0 0 0 0
6100 0 0 0 0 0 0 0 0
6200 0 0 0 0 0 0 0 0
6300 0 0 0 0 0 0 0 0
6400 0 0 0 0 0 0 0 0
6500 0 0 0 0 0 0 0 0
RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear 7th Gear 8th Gear





Some additional information on how these are calculated:

When D is the diameter of the tire, the car moves forward a distance πD with each revolution of the tire. If there are F revolutions per unit of time, it moves forward at a speed of πD´F per unit of time. If D is in inches and F is in revolutions per minute (rpm), the above result will be in inches per minute. There are 63,360 inches in a mile and 60 minutes in an hour, so one inch per minute equals 60/63360 miles per hour or 1/1056 mph. So we have the following formula:

V(mph) = D(in) ´ F(rpm) ´ (π/1056)

In the automotive industry, the coefficient 1056/π is usually taken to be equal to 336 (exactly it is 336.1352398...) and the formula corresponding to the above is:

(mph)(gear ratio)(336) = (tire diameter in inches)(rpm)

With the above numerical approximation, both formulas are identical if we consider that (rpm)/(gear ratio) is the rate of rotation of the tires. So the "gear ratio" as the number of rotations of the driveshaft for each turn of the tire. This ratio is normally more than 1, except in overdrive gear. So, calling R the "gear ratio", your final answer is:

V(mph) = D(in) ´ F(rpm) ´ (π/1056) / R

or, approximately: V = (D ´ F) / (336 ´ R)

where V is the velocity (in mph), D the tire diameter (in inches), F the engine rpm, and R the gear ratio.

 


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