01332 265826

Elite & Performance Jags can re-flash the engine management unit in your

diesel Jaguar to offer increased performance and better fuel economy, these

performance ‘tunes’ have all been fully tested and meet all  of the UK mot requirements.


They are a drive in drive out service, programming of your ECU takes around one hour,

we can normally accommodate this service as a while you wait job if booked in advance,

of course we can drop you into the local town for a bit of shopping as well, including getting your vehicle into the workshop and all hooked up the whole process should not take longer than two hours.


A few of the frequently asked questions are listed below along with some of the benefits of the performance tune, also shown are the dyno graph results for the X-Type 2.0 / 2.2 and the XJ / S-Type 2.7, simply roll over the graphs to view a larger version.


If you have any further questions or wish to book in for a performance tune please contact us.

X-Type 2.0D
X-Type 2.2D
XJ 2.7D & S-Type 2.7D

Frequently Asked Questions


Why do the manufacturers limit the power output of their engines?

The standard manufacturer tune is a compromise of hundreds of factors. Most of all the manufacturer has to ensure a high degree of engine reliability across the worldwide market taking into account factors such as:

During testing, manufacturers ‘tweak’ the tunes constantly to achieve the required results for individual tests, this compromises the overall smoothness of the original tune. EAPJ Performance Tunes are optimised for European driving conditions. As long as the manufacturers service schedule is adhered to there is no reason why this extra power can not be ‘unlocked’.


How will the emissions be affected?

All EAPJ Performance Tunes are tested to ensure that they comply with UK emissions law.


Is the tuning process reversible?

Yes. In the unlikely event that you require the EAPJ Performance Tune to be removed, the process can be reversed without any side effects.


Are there any physical changes to the vehicle?

No. EAPJ Performance Tunes are ECM software downloads only. There will be no physical evidence that the engine has been uprated.


Are there any insurance implications?

Yes. Most insurance companies require you to notify them of any modifications to your vehicle. This includes modifications such as bodykits and different alloy wheels. Some insurance companies will add a premium to your policy, others will not. EAPJ Performance Tunes are invisible and it is impossible to detect that the engine tune data has been modified.






X-Type 2.0TD                        £405.00


X-Type 2.2TD                        £405.00


XJ 2.7TD & S-Type 2.7TD   £495.00

Prices include VAT
Site contents copyright 2009 EAPJ
dyno graph x-type 2.0 large.gif
dyno graph x-type 2.2 large.gif
dyno graph s-type 2.7 - xj 2.7 large.gif