Petrol
Jaguar XJ (X350) 2003-2009 petrol remap figures
6 petrol engines for the Jaguar XJ (X350). Open yours to see the stock and expected figures for its power, torque and ECU.
| Engine / variant | Stock | Vanguard expected | Expected gain, up to | Stage |
|---|---|---|---|---|
| 3.0 V6 240bhpPetrol · 3.0L · 2003-2009 | 240 bhp 300 Nm | 263 bhp 332 Nm | +23 bhp +32 Nm | 1 |
| 4.0 V8 290bhpPetrol · 4.0L · 2003-2009 | 290 bhp 393 Nm | 320 bhp 432 Nm | +30 bhp +39 Nm | 1 |
| 4.0 V8 370bhpPetrol · 4.0L · 2003-2009 | 370 bhp 525 Nm | 405 bhp 561 Nm | +35 bhp +36 Nm | 1 |
| 4.2 V8 300bhpPetrol · 4.2L · 2003-2009 | 300 bhp 420 Nm | 330 bhp 442 Nm | +30 bhp +22 Nm | 1 |
| 4.2 V8 390bhpPetrol · 4.2L · 2003-2009 | 390 bhp 541 Nm | 425 bhp 587 Nm | +35 bhp +46 Nm | 1 |
| 4.2 V8 400bhpPetrol · 4.2L · 2003-2009 | 400 bhp 553 Nm | 435 bhp 599 Nm | +35 bhp +46 Nm | 1 |
All XJ (X350) 2003-2009 variants · Diesel versions
Please note: these are expected figures, not guarantees. Real results vary with the condition of the vehicle, the ECU software version, fuel quality and the hardware fitted. Some options - including Stage 2 and anything that needs extra hardware - are for off-road or competition use only. We check every vehicle first and confirm what is achievable before any work starts.