Catalog/ Cars/ Jaguar/ XJ

Jaguar XJ 4.2 V8 Supercharged

Name: Jaguar XJ 4.2 V8 Supercharged chip tuning
Brand: Jaguar
Price: 100.00 EUR
Availability: InStock

X351 (2009–2015) · 400 hp

Stage 1

E85

E85 + Stage 1

	Original	After tuning	Diff
Power hp	400	470	+70
Torque Nm	541	630	+89

Power gain

+18%

Torque gain

+16%

Ready to feel these +70 hp on the road?

Get your ready-to-flash Stage 1 file for the Jaguar XJ

Order tuning file →

Stage 1 file from €100

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	400	415	+15
Torque Nm	541	565	+24

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 €2 762 a year at the pump

Get your E85 adaptation file for the Jaguar XJ

Order tuning file →

File from €100

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

Fuel cost — E85 vs petrol −46%

Petrol · 100 km

~~18.7 L~~ · €39.63

E85 · 100 km

23.3 L · €21.22

You save ≈ €18.41 every 100 km — about €2 762 a year (over 15 000 km)

E85 uses ≈ +25% 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 Jaguar XJ, calculateur d'économies par département →

	Original	After E85 + Stage 1	Diff
Power hp	400	505	+105
Torque Nm	541	685	+144

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.

+105 hp and €2 762/year saved — both

Get your E85 + Stage 1 file for the Jaguar XJ

Order tuning file →

File from €100

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

Fuel cost — E85 vs petrol −46%

Petrol · 100 km

~~18.7 L~~ · €39.63

E85 · 100 km

23.3 L · €21.22

You save ≈ €18.41 every 100 km — about €2 762 a year (over 15 000 km)

E85 uses ≈ +25% 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 Jaguar XJ, calculateur d'économies par département →

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