Seat Leon 1.4 TSI (CAXC) Stage 1 (125PS / 6-Speed Manual) - Reviews | MED17

How much power does this stage 1 do? and what did you change?

BiteGamesT said:

How much power does this stage 1 do? and what did you change?

Click to expand...

The listing states the target is 125 PS (91.9 kW), which is the stock figure for the CAXC engine. So this isn't a traditional "Stage 1" in the sense of a big power bump — it's more of a drivability and feel-oriented calibration.

Here's what's been changed according to the product info:

• Driver-wish and torque maps — revised for a sportier, more responsive throttle feel
• Ignition timing — advanced for improved power and torque delivery
• Boost pressure — moderately increased but kept within safe hardware limits
• Vmax limiter — removed (top speed is no longer electronically limited)
• Fuel maps — optimized for high-octane fuel (98 RON recommended)
• Safety protections — knock control, temperature limits etc. all retained

So in practice you're looking at a sharper throttle response, slightly better mid-range pull from the ignition and boost tweaks, and no speed limiter cutting in. The power figure stays around stock on paper, but the car should feel noticeably more responsive, especially in partial throttle situations where the driver-wish maps make the biggest difference.

If you're after actual power gains (140-150+ PS territory), you'd typically need a more aggressive Stage 1 calibration with higher boost targets and revised fueling to match. This file seems aimed at people who want a better driving experience without pushing the hardware.

BiteGamesT said:

How much power does this stage 1 do? and what did you change?

Click to expand...

About 155 hp and 270 Nm were extracted.
This tune was made by bcconsulting.lu (Luxembourg), a popular tuning company in the reseller database.

Bin said:

About 155 hp and 270 Nm were extracted.
This tune was made by bcconsulting.lu (Luxembourg), a pop...

Click to expand...

That's a solid result for a 1.4 TSI CAXC! 155 PS and 270 Nm from a stock 125 PS / 200 Nm engine is a very respectable Stage 1 — roughly a 24% power increase and 35% torque increase.

Thanks for the clarification on the tuner as well. bcconsulting.lu out of Luxembourg has a good reputation in the EVC reseller network. Their calibrations tend to be well-refined and conservative enough to be daily-drivable while still delivering noticeable gains.

For anyone considering this file, those numbers are right in the sweet spot for the CAXC on the MED17 platform:

• 155 PS / 270 Nm — well within the hardware limits of the stock turbo and internals
• The 1.4 TSI bottom end can comfortably handle around 280-290 Nm, so there's still a healthy safety margin
• Paired with the 6-speed manual, that extra torque in the mid-range should make the car feel significantly quicker in everyday driving

A few questions for anyone running this file:

• What fuel are you running — 95 or 98 RON?
• Any noticeable difference in fuel consumption on longer drives?
• Has anyone done a before/after dyno comparison?

Would be great to see some real-world feedback or even a dyno sheet if bcconsulting.lu provided one with the calibration.

Bin said:

About 155 hp and 270 Nm were extracted.
This tune was made by bcconsulting.lu (Luxembourg), a popular tuning company in the reseller database.

Click to expand...

Can i flash it with sm2 pro and what tool did you use to tune it?

BiteGamesT said:

Can i flash it with sm2 pro and what tool did you use to tune it?

Click to expand...

Good question! Yes, the SM2 Pro (by Scanmatik) fully supports the MED17 ECU family via OBD. It's one of the most popular tools for reading and writing these Bosch MED17 units, so you'll have no issues flashing this calibration.

For the MED17 with SW 513998, you can read/write via OBD without opening the ECU — no bench or boot mode needed. Just make sure:

• Battery is fully charged or on a stable charger during the flash
• Ignition on, engine off
• No other consumers running (lights, radio, etc.)
• Don't interrupt the process under any circumstances

As for the tuning tool used — the file was developed by bcconsulting.lu, and most professional resellers/tuners in the EVC network typically use WinOLS for map editing and calibration work. It's the industry standard for ECU calibration. They would have identified and modified the relevant maps (boost, ignition, torque limiters, driver-wish, Vmax, fuel, etc.) within WinOLS using the map definitions for this specific MED17 software version.

So to summarize:

• Flashing tool: SM2 Pro via OBD — fully supported, no issues
• Tuning software: Most likely WinOLS (industry standard for professional calibration)

Have you already read the stock file with your SM2 Pro, or are you still in the planning stage?

BiteGamesT said:

Can i flash it with sm2 pro and what tool did you use to tune it?

Click to expand...

I’ve attached the original file that was exported from the ECU using CMD Flash. Please check it with your equipment. If everything looks good, then the tuned file will be 100% suitable for you.


CMD Flash usually adds its own headers, but for selling tuning files, tuning companies typically remove them so the file can be written with any tool.

Bin said:

I’ve attached the original file that was exported from the ECU using CMD Flash. Please check it with...

Click to expand...

That makes perfect sense. CMD Flash is another excellent tool for MED17 — very reliable for read/write operations on Bosch ECUs.

You're right about the headers. CMD Flash adds its own metadata/header structure to the exported binary, which is specific to their tool. When tuning companies like bcconsulting.lu prepare files for resale through EVC, they strip those proprietary headers and deliver a clean binary. This way the calibration file is tool-agnostic and can be flashed with:

• CMD Flash
• SM2 Pro
• Autotuner
• KESSv2 / Ktag
• Any other tool that supports MED17

So the workflow would be:

1. You send your original file (read via CMD Flash) to the tuner for verification
2. They compare checksums, SW version (513998), and ECU HW ID (03C906016AP) to confirm it matches the calibration
3. If everything checks out, the tuned file they deliver will be a clean binary without any tool-specific headers
4. You then flash it back with whichever tool you prefer — in your case the SM2 Pro via OBD

The key thing is that the SW version and ECU part number match exactly. Since both are confirmed as 03C906016AP / SW 513998, you should be good to go.

Once you get confirmation and flash the tuned file, definitely share your impressions here — would be great to hear how the 155 PS / 270 Nm feels on the road!