Siemens SIMTEC71 ECU Tuning
Engine control unit used in 13 supported models from 3 makes.
Opel with the Siemens SIMTEC71
All Opel tunes- Opel Astra1998+G · 1.8i EcotecAutoTuner
- Opel Corsa2000+C · 1.8i EcotecAutoTuner
- Opel Omega1994+2.2iAutoTuner
- Opel Tigra1994+1.8i EcotecAutoTuner
- Opel Vectra1995+B · 1.8i EcotecAutoTuner
- Opel Zafira1999+2.2iAutoTuner
Subaru with the Siemens SIMTEC71
All Subaru tunes- Subaru Traviq1999+1.8i EcotecAutoTuner
Vauxhall with the Siemens SIMTEC71
All Vauxhall tunes- Vauxhall Astra1998+G · 1.8i EcotecAutoTuner
- Vauxhall Corsa2000+C · 1.8i EcotecAutoTuner
- Vauxhall Omega1994+2.2iAutoTuner
- Vauxhall Tigra1994+1.8i EcotecAutoTuner
- Vauxhall Vectra1995+B · 1.8i EcotecAutoTuner
- Vauxhall Zafira1999+MKI / A · 2.2iAutoTuner
About Siemens SIMTEC71 tuning
The Siemens SIMTEC71 engine control unit is supported in 13 models from Opel, Subaru, Vauxhall. We read, modify, and flash it with AutoTuner, then verify the result on our Dynojet 424xLC2 in Jenison, MI. A custom calibration optimizes fueling, ignition timing, boost, and torque limits for your exact build.
Don't See Your Vehicle?
These lists cover off-the-shelf tuning platforms. We also do standalone ECU installs and custom calibrations, so reach out and we'll tell you what's possible for your build. Compatibility data last updated 2026-09-24.