Your Vehicle
BMW 3 serie 320si 173hp
Technical Specifications
Power and torque increase
Stage 1: software remap only, no mechanical changes, fully reversible.
Power HP
Torque Nm
Book your Stage 1 remap
499 € VAT included · pay online, the work is done at the workshop you choose
Power Graph
BMW 3 serie 320si 173hp: da 173 a 185HP
Remapping BMW 3 serie
MasterTuning is a leader in developing remapping for BMW. La BMW 3 serie 320si 173hp può passare da 173 HP a 185 HP con un incremento di 12 HP.
The development of each remap is customized by MasterTuning.
- 100% tested and customized files guarantee
- Tested and developed on a 4x4 dyno
- Best performance, within safety margins
- Reduced fuel consumption
ECU Remapping Details BMW 3 serie 320si 173hp
The BMW 3 serie 320si 173hp is equipped with a petrol engine that produces 173 HP and 200 Nm of torque in its factory configuration. With MasterTuning's professional ECU remapping, this BMW can achieve 185 HP (+7%) and 220 Nm (+10%).
Our Stage 1 tuning for the 3 serie E90/E91 - 2005 - 2010 delivers an impressive gain of +12 HP and +20 Nm, optimizing the petrol engine's performance while maintaining reliability and staying within safe parameters.
The engine code N45B20A identifies this specific powerplant configuration. The Bosch MEV946 ECU is professionally recalibrated to unlock hidden potential while preserving engine longevity.
The 3 serie's petrol engine benefits significantly from professional ECU calibration. The result is a more responsive, enjoyable driving experience with improved power delivery throughout the rev range.
Technical Specifications — BMW 3 serie 320si 173hp
Factory technical data for the BMW 3 serie 320si 173hp (E90/E91 - 2005 - 2010), used by MasterTuning engineers to develop a tailored, dyno-tested remap for this specific powerplant.
| Engine code | N45B20A |
|---|---|
| ECU / Control unit | Bosch MEV946 |
| Fuel | Petrol |
| Compression ratio | 12.0 |
| Bore × stroke | 84.0 X 90.0 mm |
| Stock power | 173 HP · 200 Nm |
| Remapped power (Stage 1) | 185 HP (+12) · 220 Nm (+20) |
Don't want to touch the ECU?
Rapid Dimsport add-on modules connect to the engine sensors with original connectors: they fit in a few hours and come off without a trace, leaving the factory software untouched. Useful on a leased car, one still under warranty or one you plan to sell soon. Check which ones fit your BMW 3 serie.
Frequently Asked Questions - BMW 3 serie
How much power can I gain from remapping my BMW 3 serie?
With MasterTuning Stage 1, your BMW 3 serie 320si 173hp can gain +12 HP (from 173 to 185 HP) and +20 Nm of torque. This represents a 7% increase in power.
Is ECU remapping safe for the BMW 3 serie engine?
Yes, MasterTuning's remapping for the BMW 3 serie 320si 173hp is developed within safe parameters. All calibrations are tested on our 4x4 dyno and stay within the mechanical limits of the N45B20A engine.
Is the BMW ECU remapping reversible?
Absolutely. The original factory calibration of your BMW 3 serie is always backed up before remapping. The process is 100% reversible at any time.
Will remapping affect my BMW warranty?
ECU remapping may affect your manufacturer warranty. We recommend checking your specific warranty terms. Many of our customers choose to remap after the warranty period or accept this trade-off for the significant performance gains.
Other Remaps You Might Like
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Book your remap or ask for a quote
Stage 1 can be bought online and is done at the workshop you choose; for Stage 2 we send you a quote.
Stage 2 is quoted on request: write to us and we will reply with price and timing.
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