The size of the throttle body on a Subaru STI can vary depending on the specific model and any aftermarket modifications that have been made. However, the stock throttle body size for a Subaru STI is typically 2.5 inches in diameter. It’s worth noting that aftermarket options with larger bore sizes, such as 76mm, are also available for those looking to upgrade their throttle body.
Please keep in mind that these sizes are general guidelines and may vary depending on the specific year and model of the Subaru STI. It’s always recommended to consult the vehicle’s manual or reach out to a trusted mechanic for accurate and up-to-date information on throttle body sizes for your specific Subaru STI model.
Contents
- What does a 80mm throttle body do?
- How much HP does a stock WRX STI have?
- How much HP does a 70mm throttle body add?
- Does a bigger throttle body increase HP?
- Why is STI faster than WRX?
- How much HP does a 62mm throttle body add?
- Is a bigger or smaller throttle body better?
- What size throttle body is the WRX STI?
- How do I know my throttle body size?
- How much HP does throttle body add?
What does a 80mm throttle body do?
This throttle body will increase airflow to your engine adding more horsepower and torque to the wheels.
How much HP does a stock WRX STI have?
310-hp
The WRX STI is powered by a 310-hp 2.5-liter turbocharged four-cylinder paired with a six-speed manual transmission.
How much HP does a 70mm throttle body add?
~10whp from a 70mm throttle body. If you have a d-series or a b-series you can probably forget about it.
Does a bigger throttle body increase HP?
A larger throttle body by itself would have little effect on the performance of an engine. A larger throttle body is needed when other parts such as the intake manifold, cylinder head ports, intake valves, exhaust valves, exhaust ports, exhaust system, etc. are increased in size to flow more air and exhaust.
Why is STI faster than WRX?
Overall, the key difference between the Subaru WRX and WRX STI is performance. The Subaru STI is the more powerful and performance-oriented of the two. It comes with a bigger engine, stiffer springs, thicker tires, more powerful brakes, and more. By comparison, the WRX isn’t something to sleep on.
How much HP does a 62mm throttle body add?
15-20 rwhp
Replace your restrictive stock throttle body with a SR Performance Throttle body that features a generous, free flowing 62mm twin bore design. By installing a SR Performance throttle body you can expect to see gains power gains of 15-20 rwhp and 20-25 rwtq.
Is a bigger or smaller throttle body better?
From the most basic standpoint, the higher the power output of the test motor, the larger the throttle body required. Upgrading a throttle body already capable of supporting 600 hp with a larger version capable of supporting 700 hp on a 300hp motor will have predictable results.
What size throttle body is the WRX STI?
76mm
The Big Bore throttle body offers a 76mm bore, which is nearly 25% larger than stock. Fits all 2008-2021 Subaru WRX STI.
How do I know my throttle body size?
I’ve always used the calculation formula: Engine displacement/number of cylinders x rev limit.. (For the calculation above the constants Being the 0.8 is based on VE avarage at peak for most N/A engines, and the 0.5 being of VE avarage at idle.) So 44mm throttle body be about your ball park to consider.
How much HP does throttle body add?
5-25 HP
Gains from a throttle body can be dependent on modifications. Generally speaking, anytime a throttle body is added, there will be some added horsepower. The amounts can range from 5-25 HP depending on what other modifications are done to the engine.
