BMW Z4

E85 2003 2009 · 2.3i

Stage 1

E85

E85 + Stage 1

	Original	After tuning	Diff
Power hp	204	225	+21
Torque Nm	250	265	+15

Power gain

+10%

Torque gain

+6%

Ready to feel these +21 hp on the road?

Get your ready-to-flash Stage 1 file for the BMW Z4

Order tuning file →

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

Power graph / Stage 1

PowerTorqueStock

	Original	After E85	Diff
Power hp	204	210	+6
Torque Nm	250	260	+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. Fully reversible; the car still runs on regular petrol whenever you want.

Save €1 437 a year at the pump

Get your E85 adaptation file for the BMW Z4

Order tuning file →

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

Fuel cost — E85 vs petrol −49%

Petrol · 100 km

~~9.5 L~~ · €19.61

E85 · 100 km

11.8 L · €10.03

You save ≈ €9.58 every 100 km — about €1 437 a year (over 15 000 km)

E85 uses ≈ +24% more litres, but the pump price (€0.85/L vs €2.06/L) more than makes up for it.

	Original	After E85 + Stage 1	Diff
Power hp	204	235	+31
Torque Nm	250	285	+35

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.

+31 hp and €1 437/year saved — both

Get your E85 + Stage 1 file for the BMW Z4

Order tuning file →

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

Fuel cost — E85 vs petrol −49%

Petrol · 100 km

~~9.5 L~~ · €19.61

E85 · 100 km

11.8 L · €10.03

You save ≈ €9.58 every 100 km — about €1 437 a year (over 15 000 km)

E85 uses ≈ +24% more litres, but the pump price (€0.85/L vs €2.06/L) more than makes up for it.