A Smart Roadster remap on the standard 60kW engine typically raises output from around 80 bhp to 90–110 bhp depending on the map stage, by adjusting boost pressure, fuelling and ignition timing within the Bosch MEG 1.1 ECU. No hardware modifications are required for a Stage 1 tune.
The Smart Roadster’s 698cc three-cylinder turbocharged engine is one of the most tuneable small-displacement units ever fitted to a production car. Its Mitsubishi-derived architecture, Garrett 1238S turbocharger and Bosch MEG 1.1 ECU respond exceptionally well to calibration work, offering meaningful real-world gains without demanding expensive hardware changes. Whether you’re looking to sharpen throttle response on a daily driver or squeeze every last horsepower from a track-day machine, understanding what a remap actually does — and what can go wrong — will help you make a confident, informed decision.
What a Smart Roadster Remap Actually Changes Inside the ECU
The Bosch MEG 1.1 ECU governs three primary variables: boost pressure via the pneumatic wastegate on the Garrett 1238S, fuel delivery across the rev range, and ignition advance. A remap modifies the lookup tables — known as maps — that define how the ECU responds to load and RPM inputs. On a stock 60kW car, the factory calibration is deliberately conservative; Smart’s engineers had to account for fuel quality variation across a dozen European markets, ageing components, and legal liability. That conservatism is your gain.
Boost on the standard 60kW variant runs to approximately 1.09 bar. A well-executed Stage 1 map raises this progressively, improving torque delivery from as low as 2,500 rpm rather than just at the top of the rev range. Ignition timing is advanced where the engine’s knock threshold allows, and the fuelling is trimmed or enriched to maintain safe air-fuel ratios throughout. Understanding how the Garrett 1238S wastegate controls boost pressure is key to appreciating why these gains are achievable without hardware changes at Stage 1.
Smart Roadster Remap Stages: Power Figures and What They Require
Not all remaps are equal, and the stage framework exists for good reason. Each level demands increasing mechanical integrity from the engine and supporting systems.
Stage 1 — 90 bhp (BASIC Map)
A Stage 1 smart roadster remap requires no supporting modifications. The engine must be in good health — clean air filter, no boost leaks, functioning lambda sensor — but otherwise the standard drivetrain handles the increase comfortably. Gains are felt most strongly in mid-range torque, transforming the car’s motorway and overtaking behaviour. This is the correct starting point for the vast majority of owners.
Stage 1+ — 100 bhp (PLUS Map)
This pushes boost and timing further. We recommend checking intercooler pipework for cracks and ensuring the oil cooler is functioning correctly before running this map. The 60kW’s oil cooler is a crucial safety margin at elevated output — notably absent on the underpowered 45kW Lite, which should never be remapped without retrofit cooling. Throttle response becomes noticeably sharper and the power band widens significantly.
Stage 2 — 110 bhp (PRO Map)
At 110 bhp, supporting modifications become genuinely necessary. Uprated intercooler, performance exhaust and verified fuelling components are the baseline. The standard injectors begin approaching their duty-cycle limits, and heat management becomes critical. A full breakdown of the hardware required before running a Stage 2 tune covers everything you need to validate before flashing this map. Do not run a PRO map on a stock engine expecting long-term reliability.
EVOLUTION — 125 bhp
Our highest-output map pushes the Garrett 1238S close to its flow ceiling and demands a built bottom end. This is track-day territory. Forged internals, an uprated fuel pump and comprehensive cooling upgrades are prerequisites. The gains are extraordinary for a 698cc engine, but the margin for error is narrow.
Smart Roadster Remap: Custom vs Off-the-Shelf Maps
A common decision point is whether to buy a generic map written for the platform or invest in a dyno-developed custom calibration. The honest answer depends on your goals and your car’s condition. Generic maps written specifically for the Smart Roadster 452 — as opposed to truly universal files — are developed on representative examples and work well on cars that are mechanically standard and in good health. Custom maps add value when the car has atypical modifications, specific fuel, or when a rolling road session reveals deviations from expected behaviour. A detailed comparison of custom versus off-the-shelf remaps for the 452 will help you weigh the cost difference against the likely benefit for your specific situation.
What Can Go Wrong: Risks, Limp Mode and Common Mistakes
Remapping a poorly maintained engine is the single biggest cause of disappointment and damage in the Smart Roadster community. Before any flash, address the fundamentals: check for boost leaks on intercooler hoses (they perish), inspect the boost actuator on the turbo, and verify the lambda sensor is reading correctly. An ECU that receives bad sensor data will make incorrect fuelling decisions regardless of how good the map is.
Limp mode — where the ECU detects out-of-range sensor values and reduces boost to protect the engine — is frequently misdiagnosed as a map problem when it is actually a mechanical fault exposed by the increased demands of the new calibration. The SB2 Brabus variant is particularly prone to this after remapping because its factory boost of 1.33 bar leaves less headroom. If your SB2 is entering limp mode following a remap, the diagnostic process differs from the standard 60kW car and needs specific attention.
Ignition quality matters too. The 698cc is sensitive to fuel octane. Running a high-timing map on 95 RON when the calibration was written for 98 RON invites knock, and the MEG 1.1 knock correction strategy, while functional, is not infinitely forgiving under sustained load.
Choosing the Right Smart Roadster Remap for Your Car
Start by being honest about the car’s condition and your intentions. A Stage 1 BASIC map delivers 90 bhp reliably and reversibly on any healthy 60kW engine, improves daily drivability markedly, and carries minimal risk. If you want more, build the car first: pipes, coolers, exhaust. The PLUS map at 100 bhp is an excellent compromise for owners who want genuine performance without the cost and commitment of hardware modifications beyond maintenance items.
For those considering the full 125 bhp EVOLUTION tune, approach it as an engine build project rather than a software upgrade. Going beyond Stage 2 means understanding what internal engine work the 698cc requires to survive sustained high-boost running. Done correctly, the result is one of the most entertaining lightweight sports cars on any road. Done incorrectly, it is an expensive rebuild.
Browse our map options and choose the right level for your build at smartroadster.tech/packages.
The 60kW Is the Remap Sweet Spot — Here Is Why
Of the four variants, the 60kW standard car offers the best tuning foundation by a clear margin. It has the oil cooler the 45kW Lite lacks, a lower base boost than the Brabus variants (meaning more safe headroom exists), and a large, active community of owners who have validated these maps across thousands of real-world miles. The Brabus SB2 and full Brabus cars start from a higher base but leave less room before mechanical limits are reached. If you are buying a car specifically to remap, the 60kW is the sensible choice. Documented power gains from Stage 1 remaps on the 60kW confirm consistent, repeatable results across different examples of the engine.
A smart roadster remap remains one of the highest-value performance modifications available for the 452: relatively low cost, immediately noticeable results, and fully reversible. The key variables are engine health, map stage selection, and realistic expectations about what each level demands from the hardware. Start with Stage 1 if the car is standard, validate your supporting components before going further, and you will have a quicker, more rewarding car that remains entirely reliable. The 698cc rewards patience and preparation.
Frequently Asked Questions
How much power does a Smart Roadster remap add?
A Stage 1 remap on the standard 60kW Smart Roadster raises output from approximately 80 bhp to 90 bhp with no hardware changes. Stage 2 maps reach 110 bhp with supporting modifications. The top EVOLUTION map achieves 125 bhp but requires a comprehensively built engine.
Will a remap damage my Smart Roadster engine?
A correctly calibrated map on a healthy engine carries minimal risk. The most common cause of remap-related damage is running an aggressive map on a poorly maintained engine with boost leaks, weak sensors or failing cooling components. Address all mechanical issues before flashing any new calibration.
Can the 45kW Smart Roadster Lite be remapped?
Technically yes, but it is strongly inadvisable without first retrofitting an oil cooler. The 45kW Lite was not fitted with one from the factory, and increased boost and thermal load without proper oil cooling risks accelerated engine wear and potential failure under sustained use.
Is a Smart Roadster remap reversible?
Yes. The Bosch MEG 1.1 ECU can be reflashed to the original factory calibration at any time. Our maps include the ability to restore the stock file. This also means any remap is undetectable after reversal, which matters for insurance or warranty purposes.
