What size throttle body is the GT86 stock?
The GT86’s stock throttle body is 60 millimeters in diameter.
The GT86 uses Toyota's 2.0-liter FA20 engine, a configuration shared with the Subaru BRZ and Scion FR-S. This article explains the official size, what it means for performance, and how it should influence upgrade decisions.
Stock throttle body size across the GT86 family
Key facts about the OEM size are summarized below.
- 60 mm bore on the FA20 engine powering GT86, BRZ, and FR-S.
- That size is essentially unchanged across major model years and markets, according to common OEM documentation.
In practice, the 60 mm specification serves as the baseline reference when evaluating intake components and upgrade paths.
Performance implications and upgrade considerations
If you're considering faster throttle response or higher top-end air flow, understanding the TB size helps you plan with the rest of the intake, exhaust, and ECU tuning in mind.
- Confirm the stock size is 60 mm for your specific vehicle (verify with VIN/parts catalog).
- Define your goals (daily drivability vs. track performance) to determine whether a larger TB is appropriate.
- Ensure compatibility with your intake manifold, throttle position sensor, and ECU tuning requirements if you change the bore size.
- Allocate time and resources for engine tuning and dyno verification after any upgrade.
Following these steps helps preserve drivability and ensures the tune accounts for altered airflow characteristics.
Notes on market variants
OEM throttle body size for the GT86/FR-S/BRZ family is widely reported as 60 mm. While that baseline is consistent in most markets, always verify against your vehicle’s official parts catalog to account for any regional or production variances.
Summary
The GT86 ships with a 60 mm throttle body. This OEM diameter is the baseline for compatibility with intake upgrades and ECU tuning. If you plan to change or upgrade the throttle body, start from the 60 mm standard and coordinate any larger bore with supporting intake, exhaust, and calibration work to maintain safe, reliable performance.
How much horsepower does a 90mm throttle body add?
12-15 Horsepower Gains Over Stock. Larger 90mm Throttle Body Bore for Maximum Airflow.
What size throttle body is a GR86?
76mm
aFe POWER 76mm Throttle Body for Toyota GR86 22-25 / Subaru BRZ 22-25 H4-2.4L - aFe POWER Blog, News & Events.
What size is the throttle body on a fox body stock?
Stock 60 mm throttle body. You can see the 'funnel' concept even incorporated into the stock piece.
What size throttle body is a 2018 Mustang GT stock?
The stock throttle body for a 2018 Mustang GT is 80mm, though some premium models may have an 85mm effective bore. Aftermarket options include 85mm and 87mm throttle bodies, with larger sizes like 90mm also available, which can increase airflow and power, especially when paired with other upgrades.
This video demonstrates a throttle body modification: 38sBoostedMotorsportsYouTube · Jun 17, 2022
Stock throttle body
- Size: 80mm
- Premium models: Some premium models may feature an 85mm effective bore.
Aftermarket upgrades
- 85mm throttle bodies: Companies like aFe and BBK offer 85mm throttle bodies, which can improve airflow, throttle response, and performance over the stock unit.
- 87mm throttle bodies: A popular upgrade is the 87mm throttle body from the Bullitt Mustang, which is a direct bolt-on for 2018-2023 GT models, especially when used with a GT350 intake manifold.
- 90mm throttle bodies: Some aftermarket options, like a BBK 90mm throttle body, are available that offer potential horsepower and torque gains. These may require a spacer and a re-learning process after installation, especially on a stock engine.
