GAN tuning modules · up to +30% power

Chiptuning Jaguar XJ VIII (2003–2009)

6 engines · +21 to +32 hp

up to +30%power with GAN GT
up to 15%fuel savings
up to 2 yearsengine warranty
50 daystest drive

At a glance

Jaguar XJ VIII: 6 engines — 6 petrol. The gain is +21 to +32 hp, with up to +43 Nm more torque. GAN GA+ from 199 EUR.

engines

6 petrol

+32hp

best in this generation: 4.2i 400 → 432 hp

gain range +21…+32 hp

+43Nm

max torque gain

4.2i, GA+

from 199EUR

tuning module price

GAN GA from 199 EUR · GAN GA+ from 199 EUR

Power gains

All Jaguar XJ VIII engines: exact gains

Standard output, output with GAN, the gain and the price for each box.

Engine	STOCK → with GAN	Gain	Tuning boxes and prices
Petrol · 6 engines
4.2i400 hp / 541 Nm	400 hp432 hp / 584 Nm	+32 hp+43 Nm	GA — 219 EUR · 432 hp GA+ — 219 EUR · 432 hp	Select →
3.0i238 hp / 293 Nm	238 hp267 hp / 328 Nm	+29 hp+35 Nm	GA — 199 EUR · 267 hp GA+ — 199 EUR · 267 hp	Select →
4.2i298 hp / 411 Nm	298 hp322 hp / 444 Nm	+24 hp+33 Nm	GA — 199 EUR · 322 hp GA+ — 199 EUR · 322 hp	Select →
4.2i300 hp / 420 Nm	300 hp324 hp / 454 Nm	+24 hp+34 Nm	GA — 219 EUR · 324 hp GA+ — 219 EUR · 324 hp	Select →
4.2i287 hp / 411 Nm	287 hp310 hp / 444 Nm	+23 hp+33 Nm	GA — 199 EUR · 310 hp GA+ — 199 EUR · 310 hp	Select →
3.5i258 hp / 335 Nm	258 hp279 hp / 362 Nm	+21 hp+27 Nm	GA — 199 EUR · 279 hp GA+ — 199 EUR · 279 hp	Select →

standard powergain with GAN

Each engine has its own tuning box: GAN GT / GTL or GAN GA / GA+. Prices are per box and include the current discount.

All Jaguar XJ generations Jaguar XJ (IX) 2009->

Not sure which engine you have?

The badge alone is not enough: in this generation, the same engine designation came in different power outputs, each with its own calibration. Check the power output in your registration document and find the matching row.

Same badge, different factory power outputs in this generation:

4.2i 287 / 298 / 300 / 400 hp

GAN tuning box for the Jaguar XJ VIII

Jaguar XJ VIII remap: what changes

More power and torque without rewriting the ECU or swapping any parts. The GAN box only adjusts the engine sensor signals. Your manufacturer’s warranty is preserved: the ECU software is never changed, and the box can be removed at any time.

Bluetoothchange modes from your phone
18 mapsfine-tuning for your engine

15 minutesfitted to the factory connectors
IP67water and dust protection

+32 hpbest in this generation
4.2i 400 hp → 432 hp. The other engines gain at least +21 hp; check the table for each one.
up to +30%more power
GAN GT: up to 30%, GAN GTL: up to 25%, GAN GA+: up to 12%.
GAN APPpower control via smartphone
SPORT, DYNAMIC, ECO and STOCK modes in the GAN app.
50 daystest drive
Feel the difference or get your money back, excluding delivery costs.

Prices for the Jaguar XJ VIII

GAN GA / GA+ from 199 EUR

Find your engine in the table

FAQs

Jaguar XJ VIII remap: common questions

Which tuning box do I need for the Jaguar XJ VIII?

Every engine in this generation is naturally aspirated, so it takes the GAN GA or GAN GA+. Find your engine in the table above – each row shows the box and its price.

Is a tuning module the same as a Stage 1 remap?

Not quite. Stage 1 usually means an ECU remap without replacing any parts. The tuning module also works without replacing parts, but it does not change the ECU software: it adjusts the sensor signals, comes off in about a minute, and the OFF button in the app restores the factory settings.