BC0331 – Toyota 1JZGTE Stage 2 Camshafts – Track Spec

For the dedicated tuner building a Track-Spec 1JZGTE, the limiting factor often lies above the pistons. The factory valvetrain, while robust, is engineered for a balance of drivability, emissions, and power—compromises that have no place on the circuit. Introducing the BC0331 Brian Crower Stage 2 Camshafts, a precision-ground valve timing solution engineered to unleash the true high-RPM, wide-power-band potential of Toyota’s legendary twin-turbo inline-six. These are not mere regrinds; they are race-proven profiles machined from premium-grade 8620 steel billets, featuring increased lift and aggressive duration specifically calibrated for forced induction applications. Designed for the enthusiast who measures performance in lap times and throttle response, the BC0331 cams transform the 1JZ’s character from a potent street engine into a relentless, top-end dominant power plant, capable of supporting 600+ horsepower builds when paired with appropriate valvetrain and turbo upgrades. This is the definitive upgrade for moving your power band upward and maximizing airflow where it counts most.

Engineering for Dominance: The BC0331 Camshaft Profile

At the core of the BC0331 package is a meticulously calculated 264-degree intake and 264-degree exhaust duration profile, with a respective 10.8mm (0.425″) intake and 10.8mm (0.425″) exhaust lift. This symmetrical “264/264” specification is a strategic choice for turbocharged engines. The increased duration holds the valves open longer, dramatically improving the engine’s volumetric efficiency, especially in the 4,500 to 8,000 RPM range. The significant lift increases the total curtain area for airflow, allowing the engine to ingest and expel a greater mass of charge per cycle. Unlike overly aggressive “Stage 3” or racing profiles that sacrifice all low-end manifold pressure, the Stage 2 grind is engineered to provide a substantial power increase without completely destroying street manners when paired with adjustable cam gears and proper tuning. The aggressive ramp rates are designed for precise, rapid valve actuation, necessitating the use of upgraded valve springs (such as Brian Crower’s BC0610 kit) to prevent valve float at the elevated RPM limits these cams enable.

Performance Benefits & System Synergy

Installing the BC0331 camshafts is a transformative modification that impacts every aspect of engine performance. Their primary function is to optimize airflow, which cascades into multiple, measurable benefits for a track or high-performance street application.

• Expanded Power Band: Shifts the power curve higher in the RPM range, eliminating top-end flattening and providing a relentless pull to redline.
• Increased Peak Horsepower & Torque: By maximizing airflow, these cams unlock the potential of larger turbochargers, high-flow fuel systems, and engine management tuning, often yielding gains of 40-80+ horsepower over stock-cam, turbo-only upgrades.
• Enhanced Turbo Spool & Response: The increased exhaust duration and overlap help scavenge cylinders more effectively, reducing exhaust backpressure and spinning the turbo(s) faster. This can lead to a noticeable reduction in lag and a sharper throttle response.
• Improved Volumetric Efficiency (VE): The engine becomes a more effective air pump, breathing deeper and exhaling more completely, which directly translates to more power per unit of boost.
• Race-Ready Durability: CNC-machined from 8620 steel billet and heat-treated for extreme wear resistance, they far exceed the durability of cast OEM or reground cams under high-stress, high-RPM conditions.

To function correctly, these cams demand system synergy. Upgraded valve springs and retainers are mandatory to control the valves at high lift and RPM. Adjustable cam gears are highly recommended to fine-tune the lobe separation angle (LSA) and centerlines, allowing the tuner to dial in optimal overlap for spool or top-end power. Finally, none of this potential is accessible without a comprehensive standalone engine management tune to adjust fuel, ignition, and variable valve timing parameters to suit the new airflow characteristics.

Technical Specifications & Comparison

The following table details the exact specifications of the BC0331 camshaft set and provides a direct comparison to the factory 1JZGTE (JZZ30 Soarer) camshafts, illustrating the scope of the upgrade.

*Note: The exact LSA is optimized by Brian Crower and is best fine-tuned with adjustable cam gears during the dyno tuning process.

Vehicle Fitment & Application Notes

The BC0331 camshaft set is engineered as a direct replacement for specific 1JZGTE engines. Correct identification of your engine variant is critical for a successful installation.

Primary Fitment: Toyota 1JZGTE engine with VVTi (Variable Valve Timing-intelligent). This includes engines found in:

– Toyota Supra JZA70 (1990-1992) – Note: Non-VVTi. Please verify engine code.

– Toyota Soarer JZZ30 (1990-1996) – Later models with VVTi.

– Toyota Chaser/Mark II/Cresta JZX90/JZX100 (1992-2001)

– Toyota Verossa JZX110 (2001-2004)

Critical Application Notes:

1. VVTi Compatibility: These cams are designed for use with the factory 1JZ VVTi system on the intake cam. The exhaust cam is non-VVTi. The factory VVTi cam gear must be retained and reused.

2. Non-VVTi Engines: For early non-VVTi 1JZGTE engines, a different Brian Crower part number (typically with different journal specifications) is required. Do not attempt to install the BC0331 in a non-VVTi engine.

3. Supporting Modifications are NOT Optional: As previously stressed, installation must include upgraded valve springs and retainers (e.g., BC0610). OEM springs will coil-bind and fail catastastically at the increased lift.

4. Professional Installation Required: Camshaft installation requires precise timing procedures, potential head disassembly for spring replacement, and specialized tools. This is not a beginner-level task.

Installation & Tuning Philosophy

The physical installation of the BC0331 camshafts, while meticulous, is only half the battle. The true potential is unlocked through precise tuning. After ensuring the cylinder head is fitted with the mandatory upgraded springs and the cams are timed correctly (initially to factory marks if using non-adjustable gears), the focus shifts to the engine management system. A standalone ECU (AEM, Haltech, Link, etc.) is essential to delete any error codes from the altered VVTi operation and to recalibrate the entire fuel, ignition, and cam timing maps. The tuner will need to adjust the intake cam phasing via the VVTi controller and, if adjustable gears are fitted, the exhaust cam centerline to find the optimal overlap for your specific turbo and exhaust configuration. This process, explored in depth in resources like this guide to camshaft fundamentals, is iterative and best performed on a load-bearing dynamometer. The result, however, is a 1JZGTE with a ferocious, linear power delivery that pulls harder the longer you stay in the throttle—precisely what a Track Spec build demands.