GReddy 13512112 Product Specifications
| Specification | Details |
|---|---|
| Brand | GReddy / TRUST |
| Manufacturer part number | 13512112 |
| Product category | Lightweight engine pulley kit |
| Vehicle platform | First-generation FR-S / BRZ / Toyota 86 |
| Engine | 2.0L FA20 / 4U-GSE |
| Construction | Lightweight aluminum |
| Intended purpose | Reduce accessory pulley rotating mass |
| Application | Performance engine accessory drive |
| Belt compatibility | Verify correct belt for pulley configuration |
| Installation | Engine-specific pulley replacement |
Vehicle Fitment
| Years | Make | Model | Engine |
|---|---|---|---|
| 2013–2016 | Scion | FR-S | 2.0L FA20 |
| 2013–2020 | Subaru | BRZ | 2.0L FA20 |
| 2017–2020 | Toyota | 86 | 2.0L FA20 / 4U-GSE |
The GReddy 13512112 is associated with the first-generation ZN6/ZC6 platform. Confirm exact fitment and accessory configuration before ordering.
Not intended for: Second-generation 2022+ Subaru BRZ or Toyota GR86 equipped with the 2.4L FA24 engine.
How Lightweight Pulleys Affect Engine Response
An engine must accelerate not only the crankshaft and flywheel but also the rotating components connected to its accessory drive system.
Reducing the mass of selected pulleys can reduce the energy needed to accelerate those components.
However, the actual effect depends on how much rotational inertia is removed and where that mass is located.
A lightweight pulley may make the engine feel slightly more responsive during rapid changes in RPM, but this should not be confused with a substantial horsepower increase.
For drivers interested in improving the character of their FA20 engine, pulley modifications are best considered alongside proper maintenance and other carefully selected performance upgrades.
GReddy Lightweight Pulleys vs. Factory Pulleys
| Feature | Factory pulleys | GReddy 13512112 |
|---|---|---|
| Primary purpose | Drive engine accessories | Drive engine accessories |
| Construction | Factory specification | Lightweight aluminum |
| Rotating mass | OEM baseline | Designed to reduce mass |
| Appearance | Factory finish | Performance-machined appearance |
| Engine response | Factory characteristics | Potential improvement |
| Direct horsepower increase | None | Not guaranteed |
| Installation | Factory equipped | Aftermarket replacement |
Installation and Maintenance Considerations
Proper pulley installation is essential to maintaining reliable accessory drive operation.
Before installation, inspect the existing belt, tensioner, and pulley bearings for wear.
Follow the manufacturer’s instructions for pulley replacement and verify that the new components maintain the intended belt routing and alignment.
Do not assume every aftermarket pulley combination uses the factory belt length.
If the kit changes pulley diameters or accessory drive geometry, a different belt may be required.
After installation, inspect the system for abnormal belt tracking, vibration, or unusual noise.
Verified GReddy Specifications and Kit Contents
GReddy confirms that 13512112 is a two-piece pulley kit, not a complete six-piece pulley set.
| Specification | Manufacturer details |
|---|---|
| Included pulleys | Alternator and water pump |
| Material | A2017 duralumin |
| Finish | Blue anodized |
| Weight savings | Approximately 340 grams combined versus OEM |
| Belt compatibility | Factory belt and GReddy Extreme V-Belt |
| Engine | FA20 2.0L boxer |
| Chassis | ZN6 / ZC6 |
For owners wanting the complete six-piece GReddy pulley upgrade, the alternative is GReddy 13512111.
Related My Pro Street Online Article
A highly relevant existing article covers lightweight pulley upgrades for the same platform:
Press Release: Perrin Pulleys for FR-S
This is a useful internal link for shoppers researching the benefits and tradeoffs of lightweight accessory pulleys. The article discusses a competing product, so it should be positioned as educational reading rather than a GReddy product review.
Frequently Asked Questions
What vehicles fit the GReddy 13512112?
-
2013–2016 Scion FR-S
-
2013–2020 Subaru BRZ
-
2017–2020 Toyota 86
All require the first-generation 2.0L FA20 engine.
Does the GReddy 13512112 include a crankshaft pulley?
No. It includes only the alternator and water pump pulleys.
Can I reuse my factory serpentine belt?
Yes. GReddy confirms compatibility with the factory accessory belt and its Extreme V-Belt.
How much weight does the kit save?
Approximately 340 grams combined compared with the original alternator and water pump pulleys, according to GReddy.
Does this fit the 2022+ Toyota GR86?
No. GReddy offers separate FA24 pulley components for second-generation GR86 and BRZ applications.
There are no reviews yet.