What is the steering rack ratio for the STI?
The steering rack ratio is a critical specification for any performance vehicle, as it directly impacts how the car handles and responds to driver input. For Subaru enthusiasts, particularly those who own or are considering an STI model, understanding this ratio is essential for appreciating the car's precision and agility. In this article, we’ll explore what the steering rack ratio is for the Subaru STI and why it matters.
Understanding Steering Rack Ratio
The steering rack ratio refers to the relationship between the rotation of the steering wheel and the movement of the wheels. It is expressed as a ratio, such as 13:1, which means that for every 13 degrees the steering wheel is turned, the wheels turn 1 degree. A lower ratio indicates quicker steering response, which is ideal for performance driving, while a higher ratio provides more stability, often preferred for highway cruising.
The Steering Rack Ratio for the Subaru STI
The Subaru STI is renowned for its sharp handling and precise steering, and the steering rack ratio plays a significant role in this. For most modern Subaru WRX STI models, the steering rack ratio is approximately 13.3:1. This quick ratio allows for responsive handling, making the STI a favorite among driving enthusiasts who enjoy spirited driving on twisty roads or track days.
Why the Steering Rack Ratio Matters
The steering rack ratio is more than just a number—it defines how the car feels to drive. Here are some reasons why it’s important:
- Enhanced Responsiveness: A lower ratio, like the STI's 13.3:1, means the car reacts more quickly to steering inputs, which is crucial for performance driving.
- Improved Cornering: The quick ratio allows drivers to navigate tight corners with minimal steering effort, enhancing the overall driving experience.
- Driver Confidence: Precise steering feedback helps drivers feel more connected to the road, boosting confidence during aggressive maneuvers.
Conclusion
The Subaru STI’s steering rack ratio of 13.3:1 is a key factor in its reputation as a driver-focused performance car. Whether you’re carving through mountain roads or tackling a race track, this quick ratio ensures that the STI delivers the sharp, responsive handling that enthusiasts crave. If you’re considering modifications or upgrades, understanding this specification can also help you make informed decisions about maintaining or enhancing your vehicle’s performance.
Frequently Asked Questions
What is the final drive ratio of a 04 STI?
| Drivetrain | |
|---|---|
| Gearbox | Longitudinally Mounted |
| 6 | 0.756 |
| Reverse | - |
| Final Drive | 3.9 |
What is the steering rack ratio on a 2016 STI?
The 2015-20 Subaru STI OEM 13:1 quick ratio steering rack is able to be swapped directly into 2008-14 Subaru STI's for quicker steering response and ultimately a shorter distance lock to lock.
What is the ratio of steering racks?
A steering ratio of x:y means that a turn of the steering wheel x degree(s) causes the wheel(s) to turn y degree(s). In most passenger cars, the ratio is between 12:1 and 20:1.
What is the ratio of a 15 STI steering rack?
The '15+ STI rack has a quicker ratio (13:1, ~2.4 turns lock-to-lock) as compared to the BP/BL LGT/Spec.
What is the best steering ratio?
Typical automotive steering ratios range from about 24:1 with manual steering to about 14:1 with power steering assist. The higher the steering ratio, the easier it is to turn the wheel and steer the vehicle. The lower the ratio is, the more effort is needed at the steering wheel.
What is the steering ratio of the WRX STI?
1) All U.S. Impreza RSs and WRXs have the same 16.5:1 ratio steering. This equates to 3.2 turns on the RS and 3.0 turns on the WRX, probably due to clearance issues. 2) Worldwide WRXs and U.K. Impreza turbos had/have a 15:1 ratio steering. This equates to 2.7 turns on the old body and and 2.5 turns on the new body.
What is the steering rack ratio for a 2011 STI?
Sti was 15:1 and the newest is 13:1.
What is the steering rack ratio for a Subaru?
The 2015-2021 STI has the quickest steering ratio of any Subaru product to date -- it's 13:1 compared to 15:1 on older WRX and STI models. This rack will bolt directly in to any 2008-2014 WRX or STI. (On narrow-body 2008-2010 WRX models, you will have to shorten the tie rod ends.
What does 16:1 steering ratio mean?
Steer ratio is the relationship between steer rotation and wheels rotation. IE. 16:1 means that for every 16 degrees at the steer you will have 1 degree at the wheels (tyres)... thus 90degrees of steer will generate 5.6 degrees at the wheels.
What ratio is best for racing?
To find the ideal selection, multiply the final drive ratio by the redline speed in fourth gear (152 mph) and divide that by the top track speed (140 mph). This would yield a theoretical 3.33—which is close enough to the nearest available final drive ratio of 3.36:1.
