BMW 5 serie 523i 170hp
Stage 1 chip tuning
Petrol NA · E39 - 1995 - 2003 · Siemens MS41 · 256S3
Stage 1 Results
* Values are approximate. Contact us for a precise calculation.
Technical Information
About the remap
Stage 1 optimization for the BMW 5 serie 523i 170hp increases power from 170 to 190 hp (+20 hp, +12%). Naturally aspirated petrol engines have limited scope for power gains, but optimizing ignition and fueling maps delivers a smoother power delivery, more responsive throttle, and a noticeably more pleasant driving experience.
The remap is performed on the Siemens MS41 ECU (engine code 256S3) via the OBD2 diagnostic port – no ECU removal required. We use Alientech KESSv2, Bitbox Bitbox, CMD CMDFlash. Results are verified with a dynamometer measurement.
Every vehicle undergoes full diagnostics before and after the remap. We keep a backup of the original ECU calibration and guarantee the option to revert to stock settings at any time. JVK PRO is a professional chip tuning service in Riga with 16 years of experience.
Available services
FAQ
How much does Stage 1 chip tuning cost in Riga?+
Stage 1 chip tuning at JVK PRO in Riga costs from €200 including VAT; with dyno tuning and measurements – from €350. We confirm the exact price for your engine before starting.
Is Stage 1 safe for the engine?+
Yes. Stage 1 is an optimization within factory safety margins. The remap is done via the OBD2 diagnostic port without opening the ECU. Results are verified on our dynamometer.
How long does it take?+
Usually 2 to 4 hours, including diagnostics, remapping, and a dyno verification run.
Can the original software be restored?+
Yes, we keep a backup of your original ECU file. Reverting to stock is possible at any time.
Book Stage 1
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