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Overland Tailor Tuning (OTT) offers comprehensive ECU and TCU recalibrations for Toyota vehicles, focusing on optimizing various parameters to enhance performance, drivability, and efficiency. The specific adjustments made during an OTT tune include:

Engine Control Unit (ECU) Adjustments:

• Mass Air Flow (MAF) Calibration: Adjusting the MAF sensor readings to accommodate larger MAF housings or aftermarket intake systems, ensuring accurate air-fuel mixture calculations. 
• Throttle Response Remapping: Modifying throttle curves to improve responsiveness, providing a more immediate reaction to accelerator input. 
• Variable Valve Timing (VVT-i) Optimization: Reworking camshaft timing to enhance power delivery and efficiency across various engine speeds. 
• Ignition Timing Adjustment: Refining ignition timing to improve combustion efficiency, leading to increased power and better fuel economy. 
• Acoustic Control Induction System (ACIS) Tuning: Adjusting the ACIS to optimize air intake resonance, enhancing torque and horsepower. 
• Fuel Map Corrections: Fine-tuning fuel delivery to ensure optimal air-fuel ratios under various operating conditions. 

Transmission Control Unit (TCU) Adjustments:

• Shift Point Optimization: Altering the RPM at which gear shifts occur to maintain the engine within its optimal power band. 
• Shift Pressure Modulation: Adjusting hydraulic pressure during gear changes to improve shift firmness and reduce lag. 
• Torque Converter Lockup Calibration: Modifying the engagement and disengagement points of the torque converter lockup to enhance fuel efficiency and drivability. 

Additional Customizations:

• Gear and Tire Size Calibration: Recalibrating the ECU to account for changes in gear ratios or larger tire sizes, ensuring accurate shifting.
• Injector Scaling: Adjusting parameters to accommodate larger fuel injectors, ensuring proper fuel delivery. 

Rev Hang Elimination (Manual Transmissions): Reducing or eliminating the delay in RPM drop during gear shifts for a more responsive driving experience.