Jaguar XK8 (X100) 1996-2005 4.0 V8 370bhp remap figures
Stock, this 1996-2005 Jaguar XK8 petrol (4.0L) produces 370bhp and 525Nm. Our expected figures for a Stage 1 remap are 405bhp and 561Nm, an expected gain of up to 35bhp and 36Nm.
Choose your map
Stage 1 remap figures
A Stage 1 remap is a software-only change to the ECU on an otherwise standard car. It needs no extra parts, which makes it the usual starting point.
| Stock | Vanguard expected | Expected gain, up to | |
|---|---|---|---|
| Power | 370 bhp | 405 bhp | +35 bhp |
| Torque | 525 Nm | 561 Nm | +36 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 370 bhp | 525 Nm | |
| Stage 1Maximum software-only performance | 405 bhp | 561 Nm | +35 bhp +36 Nm |
| Stage 1 EcoPerformance with economy in mind | 396 bhp | 558 Nm | +26 bhp +33 Nm |
| Eco mapEconomy first | 393 bhp | 556 Nm | +23 bhp +31 Nm |
Who is the Stage 1 map for?
- Drivers who want a sharper throttle and a small, honest gain from software alone.
- Owners who would rather keep the car standard in every other way.
- Anyone who wants the fullest software-only map for this engine, accepting that the gain is modest without a turbocharger.
What this means for your XK8
Without a turbocharger the improvement comes from ignition, fuelling and throttle mapping rather than boost, so expect a smaller but still noticeable change in response.
The ECU recorded for this variant is a Denso. Older engine management is simpler to work with, but age matters: worn sensors, leaks and tired components can hold back what a remap delivers, which is why we run a diagnostic check first.
We remap at our Belgrave Gate workshop in Leicester, or at your home or work within 30 miles, and every job starts with a diagnostic check.
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.
Figures reviewed 22 October 2026.
Stage 1 questions
How much power does the Stage 1 map give the Jaguar XK8 4.0 V8 370bhp?
We expect 405bhp and 561Nm against 370bhp and 525Nm as standard: up to +35bhp and +36Nm. These are expected figures, and we confirm what is achievable on your own car after a diagnostic check.
Does a Stage 1 remap need any extra parts on the Jaguar XK8 4.0 V8 370bhp?
No. Stage 1 is a software-only change to the ECU on an otherwise standard car.
Is there a gentler map than Stage 1 for this engine?
Yes, two. Stage 1 Eco is performance with economy in mind: 396bhp and 558Nm expected. The Eco map is economy first: 393bhp and 556Nm. Both still sit above the standard 370bhp and 525Nm.
Do I need to tell my insurer about a remap?
Yes. A remap is a modification, so you should declare it to your insurer.
More Jaguar XK8 figures
Other petrol variants
All petrol XK8 (X100) variants · XK8 (X100) 1996-2005 overview · All Jaguar figures