4.2 V8 - 304ch Tuning
Jaguar XK coupe — Detailed power and torque gains by stage.
Gains by stage(4)
Power
304 hp
Torque
420 Nm
essence
Power
304→320ch
+16 ch
+5%
Torque
420→440Nm
+20 Nm
+5%
OriginalTuned
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Everything about 4.2 V8 - 304ch tuning
Tuning the 4.2 V8 - 304ch found in the Jaguar XK coupe is one of the most popular performance upgrades. This engine offers excellent potential for power and torque gains.
On ChiptuneMAP, find verified gain data for each stage, compare tuner prices and find the ideal professional for your project.
Gains summary by stage
On the Jaguar XK coupe 4.2 V8 - 304ch, tuning delivers up to +46 hp and +60 Nm depending on the stage. Stock vs tuned figures:
| Stage | Power | Torque | Indicative price |
|---|---|---|---|
| Stage 1 | 304 → 320 hp | 420 → 440 Nm | — |
| Stage 2 | 304 → 350 hp | 420 → 480 Nm | — |
| E85 Flexfuel | 304 → 304 hp | 420 → 420 Nm | — |
| E85+ | 304 → 320 hp | 420 → 440 Nm | — |
Frequently asked questions
What gains can I expect from tuning the 4.2 V8 - 304ch?
Tuning the 4.2 V8 - 304ch (Jaguar XK coupe) delivers significant power and torque gains depending on the chosen stage. Stage 1, with no hardware modifications, offers the best gain-to-reliability ratio.
Is tuning reliable on the 4.2 V8 - 304ch?
Yes, the 4.2 V8 - 304ch is known for its reliability when tuned, especially at Stage 1. It's essential to use a certified tuner with maps tailored to your engine.
How much does Jaguar XK coupe tuning cost?
Prices vary by stage and tuner. Check our directory to compare rates from professionals near you.
Should I get a tuning box or an ECU remap?
ECU remapping (modifying the engine control unit map) delivers better results and integration than a plug-in tuning box. It's customized for each engine.
How do I find a tuner for my Jaguar XK coupe?
Use the ChiptuneMAP directory to find a certified tuner near you. Compare reviews, prices and specialties.