GIAC software calibrations for the D4 S8 are now available!
GIAC Stage 1 software is now available for D4 Audi S8. This software calibration accommodates the factory exhaust and intake system and retains OEM-like drivability, but offers dramatic performance improvements throughout the entire power band. On 91 fuel, peak to peak performance gains are measured at 65-75 wheel HP and 100-120 ft lbs wheel torque. In some areas of the power band, gains are 122 wheel HP and 133 ft lbs wheel torque. Special thanks to GMG Racing for allowing us to use their in-house S8 for software development!
- properly recalibrated air/fuel ratios,
- improved throttle response for a drive-by-cable system feel,
- optimized torque control for smoother part throttle power control and faster shifting,
- raised speed limiters to factory redline in final drive gear.
The software purchase (MSRP $2000) includes all GIAC program switching options (Stock, Race and Valet modes) and a GIAC Handheld Program Switcher. Race mode is 93 and 100 octane compatible. Pump mode is 91-93 octane compatible.
The following ECU part numbers are currently supported. If your part number is not on the list, ask your GIAC authorized dealer to submit a file request.
Dynamometer test results from an MD-500 Mustang dyno are included here. The graph plots power tests (wheel HP and TQ) for a 2014 Audi S8. The red line denotes a completely stock S8 with OEM software, exhaust, intake and charge cooler, on 91 octane. The blue line denotes the same S8 with GIAC 91 octane Stage 1 software, OEM exhaust, intake and charge cooler, on 91 octane. All runs were performed in high ambient temperatures (82 degrees Fahrenheit in the dyno cell).
RAW All Wheel Power Dyno Plot: Stage 1 - 91 octane versus Stock (GIAC dyno):
Stage 1 91 oct peak gains over stock: +65 horsepower / +119 ft. / lbs. of torque at four wheels
Stage 1 91 oct maximum gains over stock: +122 horsepower / +133 ft. / lbs. of torque at four wheels
Additional testing was performed on GMG Racing's Mustang dynamometer on 93 octane equivalent and racing fuel. Take note that different dynos will produce different results, even if they're the same type of dyno. For this test result, the blue line indicates a 2014 Audi S8 with GIAC 91 octane Stage 1 software, OEM exhaust, intake and charge cooler, on 91 octane fuel. 93 octane results are represented with the green line. Finally, the red line showcases results with 100 octane fuel. All runs were performed in very high ambient temperatures (92 degrees Fahrenheit in the dyno cell).
RAW All Wheel Power Dyno Plot: Stage 1 - 100 octane versus Stage 1 - 93 octane versus Stock (GMG dyno):
Stage 1 93 oct peak gains over stock: +81 horsepower / +100 ft. / lbs. of torque at four wheels
Stage 1 100 oct peak gains over Stock: +96 horsepower / +117 ft. / lbs. of torque at four wheels