Original + Stage 3 Tuned ECU File – ACDelco E38 Camaro LS3 6MT (12637083 / 12633238) – 432 HP

Original + Stage 3 Tuned ECU File – ACDelco E38 Camaro LS3 6MT – 432 HP (12637083 / 12633238)

Unlock maximum performance from your Chevrolet Camaro LS3 with our complete Original + Stage 3 ECU File Package, developed for the ACDelco E38 controller. This package includes both the factory OEM file and a fully engineered Stage 3 performance calibration designed for high-output naturally aspirated or mild forced-air LS3 builds.

Built for tuners and enthusiasts who demand the strongest possible performance from the LS3 platform, this Stage 3 calibration transforms throttle response, airflow modelling, ignition strategy, and torque delivery while maintaining reliability and predictable drivability.

✔ Compatible ECU / Vehicle Information

• ECU Model: ACDelco E38

• Calibration Numbers: 12637083 / 12633238

• Vehicle: Chevrolet Camaro LS3 – 6MT (Manual Transmission)

• Engine: 6.2L LS3 V8

• Stock Output: ~ 432 HP

📦 Included in the Package

1. Original OEM ECU File

A clean, unmodified factory calibration:

• Ideal for recovery or reinstalling the stock tune

• Useful as a baseline for comparisons

• 100% original GM logic, tables, limits, and strategies

• Perfect for diagnosis or reverting after modifications

2. Stage 3 High-Performance ECU File

A professional-grade tuning file engineered for maximal performance on upgraded LS3 engines. Designed for cars equipped with supporting hardware such as:

• High-flow intake

• Ported throttle body

• Long-tube headers

• Catless or high-flow cats

• Upgraded camshaft

• Improved cooling

• Performance exhaust

Main Features:

• Aggressive ignition advance optimized for premium fuel

• Airflow and VE tables remapped for high-flow setups

• Wide-open throttle enrichment recalibrated for safe high-RPM operation

• Torque model restructured for quicker response and stronger mid-range

• Rev limiter options available

• Faster throttle reaction with improved pedal mapping

• Knock control sensitivity adjusted for performance builds

• Smoother, harder pull to redline

• Stable idle logic adapted for cammed engines

Expected Output:
Depending on hardware, a Stage 3 LS3 can deliver 470–520+ HP with proper mods.

🔥 Benefits of Our Stage 3 Tune

• Track-ready but street-driveable

• Maximizes the efficiency of bolt-on and camshaft upgrades

• Stronger acceleration across the entire RPM band

• Predictable, consistent power delivery

• Safe AFRs and conservative protection systems maintained

• Developed specifically for manual LS3 Camaro (6MT)

🛠 Recommended Fuel

• 98 RON / 93 octane strongly recommended

• Lower octane reduces power and knock safety margin

⚠ Important Notes

• Stage 3 requires proper supporting hardware

• Not intended for stock-hardware vehicles

• Custom revisions available if your setup differs

📩 Need a single file, custom adjustments, or remote tuning?

Send us your ECU ID, hardware list, and requirements.
We deliver fast, safe, and accurate calibrations for all E38 LS engines.