[DRS] 4JJ1 ENGINE GIRDLE/BRACE

 DRS Girdle Installation Manual

Upgrade your 4JJ1 engine with a custom-engineered Main Cap Girdle crafted to reduce crankshaft stress and extend engine life. Although the 4JJ1 platform is famously robust, pushing it to higher horsepower levels can often lead to broken crankshafts. Our solution is a machined girdle that optimizes bottom-end support and helps curb damaging vibrations.

Key Highlights

1. Wide Crankshaft Compatibility

   • Specifically designed to handle Factory and MRX crankshafts all the way up to 3.4L displacement, offering flexibility for high-output builds.
   • Seamlessly clears both standard crankshafts and modified variants.

2. Precision CNC Construction

   • Machined to exact specifications, ensuring a snug fit and reliable performance under heavy load. 
     

3. Premium-Grade Steel
   

   • Manufactured from billet 4140 high tensile steel an alloy chosen for its proven resilience and ability to maintain structural integrity in high-stress applications.

4. Compatible with Original Main Caps

   • The girdle supports factory main caps without any modifications.
   • If you have MRX caps or another aftermarket brand, contact us to explore possible solutions.

Advantages of Installing a Girdle

• Greater Structural Stiffness
  Connects the main caps for reduced block flex, especially beneficial at elevated RPM or under heavy torque loads.

• Enhanced Reliability
  Distributes stress more evenly across the bottom end, helping prevent the well-known crankshaft failures in performance-driven applications.

• Dampened Vibrations
  Minimizes harmful harmonics to achieve smoother engine operation, reducing stress on internal components.

• Steadier Bearing Alignment
  Ensures main bearing alignment stays consistent, safeguarding oil film integrity and extending component lifespan.

• Improved Performance
  By strengthening the bottom end, higher power goals become more attainable with less worry about damaging crucial parts.

• Crankshaft Protection
  Mitigates deflection under heavy load, safeguarding essential rotating assemblies.

• Aftermarket Ready
  Suited to pair with high-performance crankshafts, rods, and other upgraded components without compromising fitment.

• Prevents Main Cap Walk
  Keeps caps from moving laterally, helping preserve precise geometry under boost or racing conditions.

Package Contents

• Main Cap Girdle
• Upgraded Fasteners

Vehicle Compatibility

• Isuzu D-Max 3.0L (2009–2020) – Applicable to DPF-equipped variants
• Holden Rodeo/Colorado 3.0L (2007–2012)

Take your 4JJ1’s performance up a notch without compromising durability. This reinforced girdle stabilizes the block under the most grueling conditions, making it an essential upgrade for enthusiasts and professionals seeking long-lasting power gains.