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Opel Signum 2.8 T

Name: Opel Signum 2.8 T chip tuning
Brand: Opel
Price: 95.00 EUR
Availability: InStock

2003–2008 · 250 hp

Stage 1

E85

E85 + Stage 1

	Original	After tuning	Diff
Power hp	250	290	+40
Torque Nm	340	400	+60

Power gain

+16%

Torque gain

+18%

Ready to feel these +40 hp on the road?

Get your ready-to-flash Stage 1 file for the Opel Signum

Order tuning file →

Stage 1 file: €95

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

Power graph / Stage 1

PowerTorqueStock

	Original	After E85	Diff
Power hp	250	260	+10
Torque Nm	340	355	+15

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 €1 745 a year at the pump

Get your E85 adaptation file for the Opel Signum

Order tuning file →

File from €100

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

Fuel cost — E85 vs petrol −47%

Petrol · 100 km

~~11.7 L~~ · €24.77

E85 · 100 km

14.4 L · €13.13

You save ≈ €11.64 every 100 km — about €1 745 a year (over 15 000 km)

E85 uses ≈ +24% more litres, but the pump price (€0.909/L vs €2.123/L, France average on October 29, 2026) more than makes up for it.

🇫🇷 Version française : conversion éthanol E85 de la Opel Signum, calculateur d'économies par département →

	Original	After E85 + Stage 1	Diff
Power hp	250	320	+70
Torque Nm	340	425	+85

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.

+70 hp and €1 745/year saved — both

Get your E85 + Stage 1 file for the Opel Signum

Order tuning file →

File from €100

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

Fuel cost — E85 vs petrol −47%

Petrol · 100 km

~~11.7 L~~ · €24.77

E85 · 100 km

14.4 L · €13.13

You save ≈ €11.64 every 100 km — about €1 745 a year (over 15 000 km)

E85 uses ≈ +24% more litres, but the pump price (€0.909/L vs €2.123/L, France average on October 29, 2026) more than makes up for it.

🇫🇷 Version française : conversion éthanol E85 de la Opel Signum, calculateur d'économies par département →

Original ECU files for Opel Signum Stock (ORI) files of this model · €20 per file →