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Brand: C.OEFT
OE numbers: 7DCT450
Product Name: Transmission Valve Body Assembly
Compatible model: /
Product status: Remanufactured
Product weight:7.636KG
Packaging size: 63X41X36cm
Product packaging: Neutral Packaging
Car Series: Chinese
Car Type: for Great Wall Haval Big Dog
1. Central Control of DCT Hydraulic System
As the "hydraulic command core" of the 7DCT450 transmission, the valve body precisely controls the flow direction, pressure, and flow rate of hydraulic oil through 32 sets of precision valve components including built-in main pressure valves, clutch control valves, and shift valves, realizing independent control of dual clutches (K1/K2) and planetary gear sets. When the TCU issues a gear shifting command, the valve body quickly switches the oil circuit (oil circuit response time ≤35ms) and synchronously completes the separation of the current gear clutch and the engagement of the next gear clutch (e.g., when shifting from 2nd gear to 3rd gear, K2 separates while K1 engages). It is a core component ensuring "power-interruption-free" transmission of the DCT, ensuring smooth power transmission from the engine (e.g., EA888 2.0T) to the wheels, and avoiding shifting jitter and power interruption caused by dual-clutch engagement deviation.
2. VW DCT-Specific Intelligent Gear Adjustment
It receives real-time data commands from the TCU (complying with VW 197 100 data protocol) and dynamically optimizes the gear adjustment strategy based on the transmission characteristics of the 7DCT450 transmission and the power needs of the vehicle:
ECO mode: Shifts up 250-350rpm in advance (e.g., shifts to 6th gear when the vehicle speed is 60km/h), targeting the lowest engine speed (1400-1800rpm) to prioritize fuel efficiency. At the same time, the coasting mode is activated (when the accelerator is released at a vehicle speed above 70km/h, the clutch separates and the engine idles).
SPORT mode: Delays shifting by 300-400rpm, maintaining a high-speed range (3000-4500rpm). At the same time, it shortens the shifting interval (e.g., completes shifting from 7th gear to 3rd gear within 1 second during continuous downshifting) to achieve "sporty" power output.
INDIVIDUAL mode: Supports users to customize shifting parameters (e.g., shifting timing, shifting speed) to meet personalized driving needs.
Manual mode (M gear): Accurately responds to the driver's shifting operations (response delay ≤60ms) and supports "paddle shifter" quick operations. At the same time, it is equipped with a gear protection function (e.g., prohibits shifting up when the speed exceeds 6800rpm, and prohibits engaging gears above 4th when the vehicle speed is below 6km/h) to avoid overload damage to dual clutches and planetary gear sets (e.g., clutch plate ablation, planetary carrier fracture).
1.Exclusive Adaptation for VW Group DCT Models, OEM-Level Precision Compatibility
As the core control component of VW Group's 7-speed wet dual-clutch transmission (DCT) (models such as DL382/DL382-7F), the 7DCT450 transmission valve body is compatible with various models including Volkswagen Golf GTI, Audi A3/A4L, and Skoda Superb. It is developed in strict accordance with VW's technical specification VW 052 180. The oil passage layout of the valve plate and spool stroke are fully synchronized with the dual clutches (K1/K2) and planetary gear sets (e.g., input shaft 1/input shaft 2 transmission mechanisms). Its interface specification is seamlessly compatible with the Transmission Control Unit (TCU, model such as VL382) and supports CAN FD high-speed data transmission (rate: 1000kbps).
It can be directly installed without additional modifications, effectively avoiding issues such as dual-clutch engagement deviation, shifting jitter, and oil pressure leakage caused by non-adaptive valve bodies. This ensures the DCT transmission regains the original "fast shifting + smooth transmission" characteristics, making it particularly suitable for replacing old valve bodies and troubleshooting repairs in vehicles with over 100,000 kilometers of mileage. After installation, it can operate stably only with basic TCU adaptive learning (approximately 15 minutes), perfectly meeting the after-sales maintenance and original replacement needs of VW Group.
2.Strict Quality Inspection, Full-Cycle After-Sales Support
Before leaving the factory, it must pass 20 VW DCT-specific quality verifications, including "2 Million Gear Cycle Shifting Test", "-40℃~150℃ Thermal Shock Test", "32MPa High-Pressure Tightness Test", "80-Hour Salt Spray Corrosion Test", "Dual-Clutch High-Torque Load Simulation Test (maximum torque 450N·m)", "Dual-Clutch Oil Compatibility Test (adapting to oil such as DQ 350/DQ 250)", etc. The unqualified rate is controlled below 0.04%, ensuring stable operation of the product in extreme high-temperature (e.g., 55℃ in desert areas), low-temperature (e.g., -40℃ in cold regions), and high-humidity environments.
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