GAC GS5 1.8T 4B18M1

2011–2017 · 177 hp · petrol

Stage 1

E85

E85 + Stage 1

	Original	After tuning	Diff
Power hp	177	220	+43
Torque Nm	242	310	+68

Power gain

+24%

Torque gain

+28%

Ready to feel these +43 hp on the road?

Get your ready-to-flash Stage 1 file for the GAC GS5

Order tuning file →

Stage 1 file: €105

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

Power graph / Stage 1

PowerTorqueStock

	Original	After E85	Diff
Power hp	177	185	+8
Torque Nm	242	255	+13

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 €1 256 a year at the pump

Get your E85 adaptation file for the GAC GS5

Order tuning file →

File from €100

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

Fuel cost — E85 vs petrol −48%

Petrol · 100 km

~~8.3 L~~ · €17.54

E85 · 100 km

10.1 L · €9.16

You save ≈ €8.37 every 100 km — about €1 256 a year (over 15 000 km)

E85 uses ≈ +22% 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 GAC GS5, calculateur d'économies par département →

	Original	After E85 + Stage 1	Diff
Power hp	177	235	+58
Torque Nm	242	335	+93

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.

+58 hp and €1 256/year saved — both

Get your E85 + Stage 1 file for the GAC GS5

Order tuning file →

File from €100

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

Fuel cost — E85 vs petrol −48%

Petrol · 100 km

~~8.3 L~~ · €17.54

E85 · 100 km

10.1 L · €9.16

You save ≈ €8.37 every 100 km — about €1 256 a year (over 15 000 km)

E85 uses ≈ +22% 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 GAC GS5, calculateur d'économies par département →

Original ECU files for GAC 4 stock (ORI) files · €20 per file →