Unitronic FLEX ECU Software Upgrade For Audi RS3/TTRS 2.5TFSI (DAZA)

Unitronic FLEX fuel enabled ECU Performance Software Calibrations feature the implementation of its own flex fuel code and additional control mapping into the factory Bosch engine control modules. When combined with Unitronic’s UniFLEX hardware, Unitronic’s FLEX code receives ethanol content over the CAN-bus and utilizes this fuel composition data to blend mapping of timing, boost pressure, fueling, and much more. Simplified, this allows for seamless transitions from 0% to 85% ethanol content — or said another way, 100% gasoline to 85% ethanol and anywhere in between, without needing an ECU reflash.

Unitronic’s FLEX enabled ECU Performance Software calibrations carry the same recommended and required supporting hardware modifications as the original non-flex fuel enabled variants, aside from the UniFLEX hardware kit and stage files, and are offered for use with both 91 octane and 93 octane gasses.

Unitronic has implemented its Wastegate Rattle Fix into all Stage 2 and Stage 3 FLEX enabled ECU calibrations. The wastegate is the mechanism that controls boost pressure, which in the case of the DAZA, is a vacuum controlled internal wastegate style. In factory trim, without any vacuum being applied to the wastegate actuator, like when driving at partial throttle, the wastegate flap sits in an open position, which is what causes the rattle sound to be audible. With Unitronic's Wastegate Rattle Fix, adjustments have been applied to the wastegate controls to hold the flap shut to eliminate the rattling sound.

By popular request, Unitronic is also proud to announce the addition of Rolling Anti Lag (RAL) into these new FLEX enabled calibrations.

Function Usage:

Turn cruise control ON, but not activated. Hold down cruise control stalk downwards (decrease speed, -), then go wide open throttle WOT. You can do this with your left fingers, while both hands are on the steering wheel with ease.

Preconditions For Function To Be Active:

70degC coolant temp minimum threshold, more than 1000rpm engine speed, more than 30kph vehicle speed, and more than 45% throttle position. The function will be activated for 6 seconds maximum and can't be re-activated for 15 seconds refresh time.

Please Note:This function is very hard on the engine and its components - IT IS NOT FOOL PROOF. It's easy to melt an engine to the ground with it. Use it wisely and at your own peril.

Available FLEX Enabled ECU Files

•  Unitronic Stage 1 91 FLEX - Calibrated for use with 91 octane and E85
•  Unitronic Stage 1+ 93 FLEX - Calibrated for use with 93 octane and E85
•  Unitronic Stage 2 91 FLEX - Calibrated for use with 91 octane and E85
•  Unitronic Stage 2 93 FLEX - Calibrated for use with 93 octane and E85
•  Unitronic Stage 3 TTE700 91 FLEX - Calibrated for use with 91 octane and E85
•  Unitronic Stage 3 TTE700 93 FLEX - Calibrated for use with 93 octane and E85
•  Unitronic Stage 3 TTE777 91 FLEX - Calibrated for use with 91 octane and E85
•  Unitronic Stage 3 TTE777 93 FLEX - Calibrated for use with 93 octane and E85
•  Unitronic Stage 3 IMS750HS 91 FLEX - Calibrated for use with 91 octane and E85
•  Unitronic Stage 3 IMS750HS 93 FLEX - Calibrated for use with 93 octane and E85