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Unitronic

ECU Performance Engine Tune Stage 1 8Y Audi RS3 2.5TFSI

$950.00

SKU: UNI-EC25T-25RS3-1

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In Stock
Ships by Aug 29
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$100 Minimum Order
30 Days Return
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Overview

The Unitronic ECU Performance Engine Tune is a Stage 1 performance software designed for the 8Y Audi RS3 with the 2.5TFSI engine. It requires 91 octane / 95 RON fuel. This sophisticated ECU tune is compatible with the Bosch® H80 MG1CS163 ECU hardware.

The software is engineered with over 20 years of experience, utilizing industry-leading tools and calibrations to ensure optimal performance while maintaining OEM-like reliability and drivability. It is extensively tested under various driving conditions and retains factory safety limiters.
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The Unitronic ECU Performance Engine Tune is a sophisticated Stage 1 performance software upgrade for the 8Y Audi RS3 equipped with the 2.5TFSI engine and the Bosch® H80 MG1CS163 ECU hardware. This tune is precisely calibrated for use with 91 octane / 95 RON fuel, aiming to enhance the vehicle's performance while upholding OEM-like reliability and drivability. Unitronic leverages over two decades of experience in engine management systems and calibrations to develop this software. The process involves extensive testing on an in-house Maha Chassis dyno and real-world street and track scenarios to ensure maximum performance, broad powerband, smooth power delivery, and optimized responsiveness. Factory safety limiters are retained throughout the calibration process, ensuring that engine operation stays within the limits of the factory components, thereby preserving reliability. This ECU unlock solution for the new H80 MG1 ECUs requires ECUs to be sent to Unitronic's Headquarters for unlock operations. Unitronic offers three options for the ECU unlock process: purchasing an unlocked ECU from Unitronic, sending your current ECU to Unitronic for unlocking, or through their UniCONNECT+ system. Software purchase is required for all options. Additional features may be available, such as Unitronic FLEX fuel enabled calibrations (requiring UniFLEX Hardware) and Unitronic Advanced Features (UAF) which include adjustable Pops and Bangs, Launch Control, and Rolling Launch Control settings. Certain hardware, like a 4-inch intake system and an upgraded intercooler, may be required for higher stages of performance tuning (e.g., Stage 2).

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandUnitronic
Part NumberUNI-EC25T-25RS3-1
CategoryIgnitions and Electrical

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Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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