What gear ratio is a Subaru r180?
The Subaru R180 is a popular rear differential used in various Subaru models, and its gear ratio is an important factor to consider when modifying or upgrading a vehicle. The gear ratio of a differential determines the relationship between the speed of the input shaft (the driveshaft) and the speed of the output shafts (the wheel axles).
What is the Gear Ratio of a Subaru R180?
The standard gear ratio for a Subaru R180 differential is 4.44:1. This means that for every one revolution of the driveshaft, the wheel axles will rotate 4.44 times. This gear ratio is commonly used in Subaru models such as the Impreza, Legacy, and Outback.
Understanding Gear Ratios
Gear ratios are expressed as a ratio, with the first number representing the input (driveshaft) and the second number representing the output (wheel axles). A higher gear ratio, such as 4.44:1, means that the wheels will rotate more times for each revolution of the driveshaft, providing more torque but lower top speed. A lower gear ratio, such as 3.90:1, will result in higher top speed but less torque.
Factors Affecting Gear Ratio
The gear ratio of a differential can be changed by replacing the ring and pinion gears, which are the main components that determine the gear ratio. This is a common modification for Subaru owners who want to optimize their vehicle's performance for specific driving conditions or preferences. Factors that may influence the choice of gear ratio include:
- Desired acceleration and top speed
- Tire size
- Engine power and torque
- Driving terrain (e.g., off-road, highway)
By understanding the gear ratio of the Subaru R180 and how it affects the vehicle's performance, Subaru owners can make informed decisions when it comes to modifying or upgrading their differential.
What is a 3.73 axle ratio good for?
The higher the ratio, the more revolutions per minute. Towing: For pickup trucks released after 2010, the best axle ratio for towing falls somewhere between 3.55 and 3.73. This range provides good acceleration for V8 gas and diesel engines.
What is the rear diff ratio of a Subaru R180?
3.90 Ratio
Subaru R180 Rear Differential 3.90 Ratio 2004 2005 WRX STI.
What diff ratio is faster?
A lower ratio gives better fuel economy but slower acceleration, while a higher ratio provides quicker acceleration but lower fuel economy. This number helps you understand a vehicle's performance and choose the best option for your driving needs.
Is a 2.75 gear ratio good?
If your car just goes around town as a daily driver and on the highway, then higher gears (lower number) like 2.75 are good. If you are looking for better ``off the line'' performance, and more ``response'', and a lower gear (higher number) would be better.
What is the differential on a Subaru?
Your vehicle's differential system is a gearbox between the drive wheels that allows wheels to turn at independent speeds and assists your car in turning. All-wheel drive Subarus have both front and rear differentials. The fluid in the differential system breaks down over time and will eventually need to be replaced.
How do I find my gear ratio?
The calculation uses the number of teeth in the ring gear and divides it by the number of teeth in the pinion gear to provide you with a “[result] to 1” ratio. For example, if the pinion gear has 41 teeth, and the ring gear has 11 teeth, the ratio would be calculated as 41/11, which is equal to 3.73 = 3.73:1.
What gear ratio is my transmission?
Here's the formula for calculating gear ratio: (RPM x Tire Diameter Inches) / (Final Drive Ratio x Transmission Gear Ratio x 336) = Actual numerical gear ratio to the ground from every revolution of the engine.
What gear ratio is faster?
Is it better to have a higher or lower gear ratio? A higher gear ratio is good when you need more acceleration to cruise your vehicle, whereas a lower gear ratio provides more torque to get the vehicle moving from a resting position.
What is the difference between 3.73 and 4.10 gears?
Additionally, with a gear ratio of 3.73, the pinion will turn 3.73 times for one turn of the ring gears, and for a 4.10, the pinion will turn 4.10 times.
What is the rear diff ratio for a Subaru?
These gears are a multiplier only for the rear diff ratio. Subaru uses only 1.0 or 1.1 ratios for the transfer gears depending on the application. The 1.1 ratio has been used with certain applications using a 3.90 final drive ratio. With the 1.1 transfer ratio a 3.545 rear diff ratio is used (3.545 x 1.1 = 3.90).
