ENGINE · 2009-present
Theta-II tuning
Theta II — Hyundai/Kia 2.0/2.4 GDI/T-GDI. I4 NA / turbo direct injection, 2.0 L / 2.4 L, 174-275 HP (Veloster N 275, Sonata 2.0T 274) stock. Cars: Hyundai Veloster N, Sonata 2.0T, Genesis G70 2.0T, Kia Optima 2.0T, Stinger 2.0T.
Engine specs
| Engine code | Theta-II |
|---|---|
| Configuration | I4 NA / turbo direct injection |
| Displacement | 2.0 L / 2.4 L |
| Production years | 2009-present |
| Stock power | 174-275 HP (Veloster N 275, Sonata 2.0T 274) |
| ECU family | Bosch MED17.9.21 / Continental SIM2K-260 → |
Tuning stages on Theta-II
| Stage 1 | +30-50 HP |
|---|---|
| Stage 2 | +60-90 HP (intake + downpipe) |
| Stage 3 | +120+ HP (turbo upgrade) |
Conservative real-world estimates. Actual results depend on hardware health, fuel quality, ambient temperature, and the specific calibration written.
Services available on Theta-II
Common DTC codes on Theta-II
Brands running Theta-II
Workshop workflow
- Read the Theta-II ECU via OBD or bench using your existing flasher (KESS3, AutoTuner, MPPS, Trasdata, FRF).
- Open Softechpro V5 and drag the .bin / .ori / .hex / .s19 / .frf onto the workspace. The Bosch MED17.9.21 variant is auto-detected.
- Pick the service tab and apply Stage 1 / 2 / 3 / DPF OFF / EGR OFF / AdBlue OFF as required.
- Save patched .bin — the TPROT + multi-block CRC32 is recomputed automatically.
- Flash via your existing flasher. Adaptation reset via OEM scan tool if required.