The Jackal Motorsports 187mm Lower Pulley is designed to push the Audi 3.0T supercharged platform beyond its factory limits by increasing supercharger speed and overall boost.
By stepping up from the stock crank pulley to a 187mm overdrive setup, you increase airflow, torque, and power across the entire RPM range — making this one of the most effective upgrades for EA837 and CREC-equipped vehicles.
While most pulleys focus only on size, this one was built to address one of the biggest limitations in higher boost setups: belt slip.
Why Upgrade Your Lower Pulley?
The factory pulley is not only failure prone, but it limits how fast the supercharger can spin. Increasing the diameter allows the blower to operate at a higher speed, resulting in:
- Increased boost pressure
- Stronger midrange torque
- Improved top-end power
- More responsive acceleration
This is the foundation of a proper dual pulley setup.
What Makes The Jackal Pulley Different?
Etched Belt Surface (Reduced Slip, More Boost)
One of the biggest issues with pulley upgrades is belt slip.
Less grip = less boost.
This pulley features a precision-etched belt surface designed to:
- Increase belt traction under load
- Reduce slip at high RPM
- Deliver more consistent boost levels
- Improve repeatability between pulls
This results in more predictable and consistent performance compared to conventional pulley designs.
Precision Offset Install Design (Easy Installation)
This isn’t just a larger pulley — it’s engineered for correct alignment and repeatable installs.
- Clearly marked "187mm" offset engraving on the front
- Rear alignment indexing for proper orientation
- Included alignment stud for easier installation
- Designed to maintain proper belt tracking
- Larger front opening for clear easy bolt installation
Upgraded Hardware Included
Everything needed for a secure install is included:
- High-strength Grade 12 hardware
- Blue Loctite for proper torque retention
- Alignment stud for offset positioning
Performance Benefits
- Increased supercharger speed
- Higher and more consistent boost
- Improved throttle response
- Stronger acceleration throughout the powerband
- Reduced belt slip compared to conventional pulleys
Fitment
Compatible with Audi 3.0T Supercharged platforms:
- B8 / B8.5 S4 & S5
- C6 / C7 / C7.5 A6 & A7
- Q5 / SQ5
- Q7 (4M / 4L)
- All EA837 and CREC variants
Notes
For best performance, pair with Jackal Motorsports ECU and TCU tuning designed for upgraded pulley ratios.
