Catalog/ Cars/ BMW/ Serie 5

BMW Serie 5 525i - N53

E6x (2003–2010) · 218 hp

Stage 1

E85

E85 + Stage 1

	Original	After tuning	Diff
Power hp	218	265	+47
Torque Nm	270	315	+45

Power gain

+22%

Torque gain

+17%

Ready to feel these +47 hp on the road?

Get your ready-to-flash Stage 1 file for the BMW Serie 5

Order tuning file →

Stage 1 file from €75

Exact price depends on the ECU — confirmed when you upload the file

✓ Original file back-up ✓ Delivered in ~30 min ✓ Support included

Power graph / Stage 1

PowerTorqueStock

	Original	After E85	Diff
Power hp	218	230	+12
Torque Nm	270	280	+10

E85 adaptation (no Stage 1)

Just the fuel switch: the ECU is adapted to run Superéthanol E85 (up to 85% bio-ethanol) with no Stage 1 chip on top. You get a small power bump from ethanol's higher octane (~104 RON) and a much cheaper fill-up. Flex Fuel file: the car still runs on regular petrol whenever you want.

Save €1 454 a year at the pump

Get your E85 adaptation file for the BMW Serie 5

Order tuning file →

File from €100

✓ Original file back-up ✓ Delivered in ~30 min ✓ Support included

Fuel cost — E85 vs petrol −45%

Petrol · 100 km

~~10.2 L~~ · €21.53

E85 · 100 km

13.0 L · €11.83

You save ≈ €9.69 every 100 km — about €1 454 a year (over 15 000 km)

E85 uses ≈ +28% more litres, but the pump price (€0.909/L vs €2.116/L, France average on October 30, 2026) more than makes up for it.

🇫🇷 Version française : conversion éthanol E85 de la BMW Serie 5, calculateur d'économies par département →

	Original	After E85 + Stage 1	Diff
Power hp	218	280	+62
Torque Nm	270	345	+75

E85 + Stage 1 remap

Chip tuning re-optimised for Superéthanol E85: the ignition and boost maps are calibrated to make full use of ethanol's higher octane (~104 RON). Bigger power and torque gains than either Stage 1 on petrol or E85 adaptation alone, plus the same cheap fill-up.

+62 hp and €1 454/year saved — both

Get your E85 + Stage 1 file for the BMW Serie 5

Order tuning file →

File from €100

✓ Original file back-up ✓ Delivered in ~30 min ✓ Support included

Fuel cost — E85 vs petrol −45%

Petrol · 100 km

~~10.2 L~~ · €21.53

E85 · 100 km

13.0 L · €11.83

You save ≈ €9.69 every 100 km — about €1 454 a year (over 15 000 km)

E85 uses ≈ +28% more litres, but the pump price (€0.909/L vs €2.116/L, France average on October 30, 2026) more than makes up for it.

🇫🇷 Version française : conversion éthanol E85 de la BMW Serie 5, calculateur d'économies par département →

Original ECU files for BMW 28 112 stock (ORI) files · €20 per file →