484Q-12-450B

Brand: Haima

Model: S7

Product Name：Exhaust Phaser VVT

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Product Details

Haima S7 Exhaust Phaser VVT (Part No.: 484Q-12-450B)

Let’s get straight to it—this isn’t just a “mechanical part” in your Haima S7’s engine. It’s the core timing-adjusting component of the exhaust side Variable Valve Timing (VVT) system: a precision-machined component made of high-strength alloy steel, mounted directly on the exhaust camshaft. Working with the VVT solenoid and engine control unit (ECU), it dynamically adjusts the opening and closing timing of the exhaust valves. Think of it as the “exhaust timing tuner”—by optimizing exhaust valve phasing based on engine speed and load, it enhances combustion efficiency and overall engine performance. Without it, the VVT system’s exhaust side fails, leading to reduced power, higher fuel consumption, and increased exhaust emissions.

This exhaust phaser VVT is exclusively tailored for Haima S7—always confirm your vehicle’s VIN and engine model (matching the 484Q series) to ensure a perfect fit! It’s calibrated to the S7’s engine specs: its rotational range aligns with the exhaust camshaft’s movement (precise timing adjustment), its oil pressure tolerance matches the engine’s lubrication system (stable operation), and its structural design fits the cylinder head layout (secure installation). Opt for generic parts? You’ll face issues: mismatched timing range (erratic engine operation), poor oil pressure resistance (component jamming), or improper fit (installation failure).

Core Jobs: Optimize Exhaust Timing & Boost Engine Performance

As a key part of the S7’s VVT system, it undertakes three critical roles:

Dynamic exhaust timing adjustment: Receiving oil pressure from the VVT solenoid (controlled by the ECU), it rotates the exhaust camshaft slightly to alter valve opening/closing timing. At low speeds, it advances exhaust timing to reduce residual gas and improve torque; at high speeds, it retards timing to enhance power output.
Improve fuel economy: By optimizing exhaust gas flow and combustion efficiency, it ensures fuel is burned more fully, lowering the S7’s fuel consumption by 4–8% compared to non-VVT setups.
Reduce exhaust emissions: Optimized exhaust timing minimizes harmful pollutants (e.g., NOx, HC) by promoting complete combustion, helping the vehicle meet emission standards.

This 484Q-12-450B exhaust phaser VVT only works for Haima S7 with 484Q series engines—wrong fit = VVT system failure:

Fits These Models: All Haima S7 variants equipped with the 484Q engine (matches camshaft specs, oil pressure requirements, and cylinder head design—confirm via VIN).
Won’t Fit These:

Haima models with non-484Q engines: e.g., Haima S5, Haima M6—different camshaft designs and VVT system layouts (parts can’t sync).
Non-Haima vehicles: Even if similar in appearance, engine architectures and oil pressure specs differ drastically (no functional compatibility).
Haima S7 with modified engines: Aftermarket camshafts or VVT solenoids may alter timing requirements—original phaser can’t adapt.

Installation & Maintenance (Pros Only—Precision Critical!)

Installation: Must Be Done by Certified Technicians

Replacing the exhaust phaser involves camshaft timing calibration and oil system handling—DIY risks severe engine damage:

Engine prep: Techs disconnect the battery, remove engine covers and timing belt/chain components, and access the exhaust camshaft on the cylinder head.
Remove old phaser: They unbolt the old phaser from the camshaft, clean the mounting surface, and inspect the camshaft for wear or damage.
Install new phaser: They align 484Q-12-450B with the camshaft’s timing marks, bolt it to Haima’s exact torque specs, and reconnect the oil passage.
Timing calibration: Critical step—techs use professional tools to reset the engine’s valve timing, ensuring synchronization between the phaser, camshaft, and crankshaft.
Test run: They refill engine oil, start the engine, and scan for ECU fault codes. A test drive confirms smooth performance (no power lag, normal fuel consumption).

Maintenance: Simple Checks to Avoid VVT Failure

Use recommended engine oil: Always use Haima-specified oil grade. Low-quality or wrong viscosity oil clogs oil passages and damages the phaser’s internal mechanism.
Check for oil leaks: Inspect the oil passage interface monthly. Leaks reduce oil pressure, preventing proper phaser actuation.
Scan for ECU fault codes: If the engine warning light comes on, have the ECU scanned immediately. VVT-related codes (e.g., “P0016”) indicate phaser or solenoid issues that need prompt repair.
Regular oil changes: Change engine oil and filters per the S7’s maintenance schedule. Clean oil keeps the phaser’s internal components free of debris.

Summary: Haima S7 Exhaust Phaser VVT (484Q-12-450B)

This is a core VVT component exclusive to Haima S7 with 484Q series engines (confirm VIN for fitment). Made of high-strength alloy steel, it’s mounted on the exhaust camshaft, working with the VVT solenoid and ECU to adjust exhaust valve timing.

Its key functions: Dynamically tweak timing (advances at low speeds for torque, retards at high speeds for power), cuts fuel consumption by 4-8% via optimized combustion, and reduces emissions.

It only fits Haima S7 484Q variants, incompatible with other Haima models (e.g., S5, M6) or non-Haima vehicles. Installation requires certified techs with timing calibration; maintain by using specified oil, regular oil changes, and prompt ECU code scanning. Original parts are a must to avoid timing errors or engine damage.

484Q-12-450B