Seat · Stage 1
SEAT Leon 1.4 TSI Stage 1 (February 2026)
A mobile Stage 1 calibration by MTechTuning, with dealer-level diagnostics before and after tuning.
Published vehicle figures
Stock
125hp
200Nm
Stage 1
155hp
270Nm
Difference
+30hp
+70Nm
Figures published for this vehicle. Results vary with model year, software, fuel and condition, so we confirm what suits your car before quoting.
SEAT Leon 1.4 TSI Stage 1 (February 2026)
This SEAT Leon 1.4 TSI went from 125hp and 200Nm to 155hp and 270Nm with our Stage 1 calibration.
The difference is torque
The 1.4 TSI feels restricted in standard form, especially through the mid-range. An extra 70Nm makes it accelerate harder from lower revs and feel far more eager through the gears.
Usable performance
It is not about headline numbers. Overtakes take less effort, motorway cruising is more relaxed and the car pulls cleanly through the rev range.
ECU and tools
This car has a Bosch MED17.5.25 ECU and was calibrated through the diagnostic port with AutoTuner, with no bench work.
Included
- Speed limiter solution
Do you tune lots of Leons?
Yes, it is one of our most popular cars. We come to you across Bristol, North Somerset, Somerset and South Wales.
About this job
The results
From 125hp as standard to 155hp, the SEAT Leon 1.4 TSI gained 30hp, roughly 24% more power.
Torque rose from 200Nm to 270Nm (+70Nm), which is what you feel most in everyday driving: stronger pull from low revs and easier overtaking.
What the work involved
This was a Stage 1 calibration: no hardware changes, just carefully refined engine software. Boost, fuelling, timing and torque limits are adjusted within safe margins for more usable performance every day.
How we carried it out
- Diagnostic scan for stored faults before any work
- Stabilised power supply connected while programming
- Original software read and saved, so the car can be returned to standard
- Calibration written, then the car checked again afterwards
Thinking about the same for your Seat?
We come to you from our Weston-super-Mare base, across Bristol, Somerset, Gloucestershire, Wiltshire, South Wales and parts of Devon and Dorset. Results depend on the exact car, so we confirm what suits yours before quoting.
- Dealer-level diagnostics before and after
- Fully mobile, at home or work
- Lifetime software warranty and support
- 14-day money-back guarantee
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