Select-A-Map ECU - Internal ViewDespite the sophisticated nature of the Select-A-Map ECU, installation takes little more time than that of a simple tuning box. Very few connections are required and, thanks to Select-A-Map’s universal, patented method of interfacing with the vehicle engine management system, the installation is non-intrusive and can be performed without cutting any of the vehicles wires*.

The standard maps will provide excellent results for most vehicles, giving a good balance of driveability, performance and economy that is well within the limits of the engine and its management system. No further refinement is necessary.

However, if further refinement is desired, to achieve the engines maximum performance, for example, any of the 5 fuel maps can be customised by the installer. The installer may charge a fee for this service.

To arrange a demonstration or installation, please contact your nearest dealer.

Please Note: Some additional work may be necessary before installation can commence, such as DPF regeneration or general servicing. This is to ensure that the Select-A-Map ECU is able to reliably and properly calibrate and operate. The installer will advise of any additional fees if such work is necessary.

* An optional vehicle specific fuel rail pressure sensor adaptor may be required.

Price does not include any LPG or CNG harnesses or other dual fuel hardware.


Power AND Economy

The Select-A-Map ECU will match (or better)
ANY diesel tuning box performance!

Select-A-Map - Diesel Remap ECU

The Compromise

While it may sometimes be possible to improve on the compromise made by the vehicle manufacturer and achieve a slight increase in both performance and economy, for any real gains, there will always be a trade-off between the two.

No exceptions

  • No single remap can provide the best performance AND economy simultaneously.
  • Running high performance maps continuously will inevitably lead to DPF problems.

This is especially true of diesel tuning boxes, which indiscriminately control fuel, irrespective of engine speed and load, resulting in an even greater compromise that leads to wasted fuel, in the form of particulate emissions, further increasing the likelihood of DPF problems.

Read more about the differences between remaps and diesel tuning boxes here.


No Compromise

Select-A-Map - Diesel Remap ECU
Highest Performance* Check
Best Economy* Check
Lowest Emissions* Check

A engine remap using the Select-A-Map ECU can out-perform any diesel tuning box in terms of performance, economy AND emissions.

This is possible because, like any conventional fuel remap, Select-A-Map remaps the vehicle's fueling in accordance with engine speed and load but, unlike any conventional remap, Select-A-Map provides FIVE instantly switchable maps (via a remote control).

Each of the 5 maps can be completely customised** and optimised, ensuring that the purpose for which the map is intended, be it performance, economy, or emissions, the best possible results can be achieved, without compromise!

Innovation and Versatility

The Select-A-Map's unique design means that not only can fueling be increased but, where necessary, fueling can just as easily be decreased, all in accordance with engine speed and load. This gives fuel control capabilities that are far more accurate and superior than any tuning box and enables maps to be created that give greater economy, better emissions or that can prevent, or even reverse, DPF blockage.


Performance Guaranteed

We don't make wild claims or promises about how much extra power the Select-A-Map ECU will give your vehicle – we leave that to the diesel tuning box suppliers – Instead we make one simple guarantee:

The Select-A-Map ECU will match (or better)
ANY diesel tuning box performance!


We can make this claim because the Select-A-Map diesel control ECU is comparable to a full diesel fuel remap, with which no diesel tuning box can ever compete (more info here).

Additionally, the Select-A-Map provides 5 instantly switchable fuel maps, allowing quick switching between performance and economy modes while driving***, making it a unique, no compromise solution that, unlike any remap or tuning box, is also DPF friendly.

* Compared with a diesel tuning box on the same vehicle and assuming Select-A-Map has been correctly installed, calibrated and configured and that the relevant map has been selected and professionally refined.

** The installer may charge a fee for any additional map refinements.

*** For safety reasons, the engine is required to be at idle speed before map switching will occur.


Jump to section:

Chequered FlagsRemap Wins Every Time

A quick search of the internet (click here for an example) for advice and comparisons of diesel remaps vs diesel tuning boxes, reveals a near-unanimous opinion that the remap (also known as a ‘rechip’ or ‘chipping’) is far superior to any diesel tuning box.

Most people (except maybe diesel tuning box manufacturers!) will agree that a diesel tuning box is no match for a proper engine remap. And how could it be? – To map an engine properly, in accordance with engine speed (rpm) and load, it is essential to know what the engine speed and load values actually are at any given moment.

3D Fuel MapWithout such information, no diesel tuning box, however sophisticated it may be, can compete with a professional diesel engine remap.

A full engine remap performed by a reputable remap specialist, such as Superchips, Dimsport, Evolution Chips, Revo, ‘Tune My Engine’, MAS Performance, Elite Remaps, Celtic Tuning, Chip Tuners or TD Performance will always be able to out-perform any diesel tuning box in terms of performance, economy and drive-ability.

Return to top of page

So Why Would Anyone Buy a Diesel Tuning Box?

Wild ClaimsSince so many people agree that a remap will always be able to achieve a better balance of performance, economy and drive-ability than any diesel tuning box, why do so many ‘black box’ solutions exist and why do so many people continue to buy them and fit them to their vehicles? Do people really believe the wild claims made by some of the less reputable diesel tuning box suppliers?

Well, there are plenty of reputable diesel tuning boxes to chose from; Chip Express, The BHP Plus Speedhawk, the DTUK CRD2+ and CRD-T, the Tunit I, II, III and IV, the Synergy, the van Aaken Diesel Smartbox or the ‘Original TuningBox’, to name but a few. Even some of the more reputable diesel tuning box manufacturers have been known to get a little ‘creative’ with their fuel economy and performance claims, but few would be foolish enough to claim they can compete with a professional fuel remap.

Diesel tuning boxes vary greatly in sophistication and price, ranging from the cheap and crude ‘resistor in a box’ type devices, as sold on some auction sites, to the more sophisticated, microprocessor controlled devices that, in some cases, may be able to achieve moderately good results, despite lacking the accuracy and control of a fuel remap.

Of course one reason for opting for a diesel tuning box over an ECU remap is often cost. While it may be false economy, a diesel tuning box is often cheaper to purchase than a professional remap, giving the perception of being ‘better value for money’, at least in the short term. If combined with other factors, such as a design that facilitates easy installation or quick removal, this may be enough to persuade some people that a diesel tuning box is their best option.

Return to top of page

ECU Remapping – Problems and Risks

Vehicle ECUThere are, however, a growing number of vehicles for which a diesel tuning box is the only practical option. Improvements in vehicle engine management technologies, especially in recent years, have brought about an increase in processor sophistication and code protection securities that put conventional ECU remapping under threat.

While such complications do not necessarily make ECU remapping an impossibility, the increased difficulties and risks associated with such procedures can make the work extremely specialised and prohibitively expensive.Even if it is practical to carry out an ECU remap, there are a number of potential issues to consider:

If a remap can be performed without opening the vehicle’s ECU:

  • Will remapping be detected by dealer equipment and will it affect the vehicle’s warranty?
  • If an error should occur during reprogramming, could the ECU be rendered inoperable?
  • Could the new map be overwritten during routine servicing and dealer firmware updates?

If a remap cannot be performed without opening the vehicle’s ECU:

  • Can the ECU be opened without risk of damage?
  • Will the vehicle warranty be affected by opening the ECU?
  • Can successful remapping be guaranteed once the ECU has been opened?

Return to top of page

The Diesel Particulate Filter (DPF) Problem

For modern vehicles fitted with Diesel Particulate Filters, DPF blockage is a common problem. DPF regeneration should automatically clear the filter periodically, but it can only do so when conditions are right for the procedure to safely commence. Even factory standard vehicles running factory standard  fuel maps can suffer DPF blockage but the situation is made worse when the engine has been remapped or fitted with a diesel tuning box.DPF Filter

Diesel tuning boxes are particularly likely to cause DPF blockage since they lack the ability to control fuel in accordance with engine speed and load. Such indiscriminate increases in fuel can cause frequent over-fueling, with the result that particulates build up in the filter faster than DPF regeneration can remove them.

This is also true of an over-zealous remap, but even the most carefully and professionally executed remap can accelerate filter particulate build-up. Any diesel tuning box or remap that is permanently activated will accelerate DPF particulate build-up if it causes any increase in unburned fuel.

Some products, such as the Superchips Bluefin or the Dimsport Genius allow users to remap their own vehicles, a feature which could, theoretically, be used to help prevent DPF blockage by frequently reverting the vehicle’s ECU back to the standard fuel map. However, these devices reprogram the vehicle’s ECU so the procedure is not without risk and cannot be performed instantly, making it an impractical solution for the prevention DPF blockage.

Return to top of page

The Best of Both Worlds (and then some!)

So clearly an ECU remap provides the best results but involves procedures that can be fraught with problems and risks. Installation of a diesel tuning box, on the other hand, provides a far less risky solution but with typically poor results.What if it were possible to take the best of both and combine them into one unit? 

Diesel Control ECU


Imagine a device that looks like a tuning box, installs like a tuning box, can be quickly removed like a tuning box but is able to remap the fuel, taking into account engine speed and load, just like an ECU remap. Now wouldn’t that be the perfect solution!?

After years of research and development, CRD Technology have designed exactly that! The Select-A-Map ECU allows a vehicle to be remapped simply and safely without tampering with the ECU, yet it is quickly and easily installed, just like a diesel tuning box.

It provides not just one but FIVE fuel maps, instantly switchable via a remote key fob, and a host of other features not found in any other device.

It is also has a number of DPF-friendly features and the ability to switch to a standard or low power map when a higher power map is not required, helping to reduce any risk of DPF blockage to a minimum.

The solution is Select-A-Map!

Read more about the features and benefits of Select-A-Map here.

Return to top of page

Technical Information

For those of you who are technically minded and would like to know more about how the system works, click the link below
to either view or download the full operator manual of the Diesel Control ECU.

Diesel Control ECU – Operator Manual

View Manual Online

(Opens in a new window)

Download Manual

(PDF format – 1,950 KB)

Investor Opportunity

CRD Technology are currently seeking investment for global expansion.

Please contact Bert Clegg for further details.

Fleet Operator SavingsThe SELECT-A-MAP diesel control unit will be of particular interest to fleet users as a simple way of reducing their ever increasing fuel costs. The unit is easily installed and all electronic fuel adjustments remain within the manufacturer’s original engine management system tolerances.The tachometer ‘Green Band’ represents the manufacturer’s optimum engine speed range for both economy and torque.

Operators encourage their drivers to stay within this speed range to save fuel. However, drivers often make excessive use of the ‘Red Zone’ and waste fuel.

Driver trainers are often used to promote sensible driving within the green band, but after a while, in most cases drivers tend to revert to their normal driving style.

The SELECT-A-MAP can be programmed to not only increase torque in the green band but also to limit fuelling in the red zone which encourages a change of driving habits, with earlier gear changes that keep the engine within the green band, resulting in significant fuel savings.

Units can also be individually mapped to suit the operator’s particular requirements.

Acceleration Control Feature

An additional, unique feature is Acceleration Control, that can be used on its own, with a standard map or in combination with a fuel modification map.

It provides a simple method of controlling performance based on engine acceleration rate, allowing acceleration to be limited without reducing torque at slowly increasing or constant engine speeds.

The SELECT-A-MAP positively encourages drivers not to accelerate rapidly and to ensure they stay within the green band, resulting in fuel savings and greater vehicle life.

The SELECT-A-MAP is a universal product that can also be used in many common rail diesel engine applications with custom mapping facility for agricultural, marine use etc.

Diesel-Blend – LPG/CNG

Click here to find out how Select-A-Map can reduce fuel costs and emissions even further when used as a dual-fuel diesel-blend ECU to inject a cheaper, greener fuel such as Liquid Propane Gas (LPG) or Compressed Natural Gas (CNG).

Diesel Particulate Filter (DPF) Friendly

DPF FilterMany modern cars are vulnerable to DPF blockage, especially when they are subjected to driving conditions that are incompatible with automatic DPF regeneration.

For example, if the car is mainly driven in slow moving traffic or used for short journey commuting, where the engine is rarely subjected to the driving conditions necessary for effective DPF regeneration, a build up of particulates in the filter can occur, ultimately leading to blockage.

The problem may be exasperated by overzealous engine remapping or crude ‘diesel tuning boxes’ which can increase the amount of unburned fuel entering the exhaust system in the form of particulates.

The result is the inconvenience of frequent trips to the dealer for ‘forced regeneration’, which may be a chargeable job.

The Select-A-Map ECU reduces the risk of DPF problems by allowing any increase in fuel to be governed by engine speed and load so that fuelling can be accurately controlled to reduce particulate emissions to a minimum. Uniquely, with 5 instantly switchable maps to choose from, it is also possible for the Select-A-Map ECU to be configured to automatically default to a standard or more DPF friendly map under normal driving conditions, allowing any of the enhanced performance maps to be selected only when needed.

DPF Removal

An additional plug-in emulation module is also available for use with the SELECT-A-MAP. This will appease the engine management system of most vehicles and prevent them from going into limp mode, if the DPF were to be removed.

Rolling Road plot showing diesel mapping capability

The SELECT-A-MAP ECU offers the driver a choice of maps that can be switched in an instant, allowing power to be increased only when needed, therefore reducing fuel consumption and further reducing any risk of DPF problems.

High Torque and Higher BHP

High Torque and Lower BHP

Standard Torque and BHP

Rolling Road Plot

Diesel-Blend – LPG/CNG


Diesel-Blend Dual Fuel Demonstration VehicleAnother cost saving option for fleet operators and high mileage diesel users is to run their vehicles on a cheaper fuel blend.

The Select-A-Map ECU was also developed to enable common rail diesel engines to run on a blend of at least 2 fuels, the most common being Liquid Propane Gas (LPG) or Compressed Natural Gas (CNG). It is compatible with most existing makes of LPG or CNG liquid and vapour systems that are designed to operate with multipoint petrol injection vehicles when used in diesel blend applications.

LPG substitution ratios of up to 40% are normal whilst using CNG ratios of above 50% can be substituted on much lower price fuel giving savings of typically between 10-25%.

The SELECT-A-MAP Diesel Blend ECU has many features and benefits not previously available including a choice of maps to suit the type of secondary fuel being used (LPG or CNG) and different operator requirements. Precise control of each fuel via two separate maps allows ethe perfect mixture to be achieved without any increase or decrease in overall engine power.

The Select-A-Map system acts as a universal interface when used with an LPG or CNG gas system, providing the gas system with simulated conventional petrol fuel injection signals that enable any standard gas system to be used in a dual-fuel / diesel-blend application. This unique approach means that the Select-A-Map can be used with virtually any gas system to create a diesel-blend system. Manufacturers of compatible gas systems include (but are not limited to) Prins, Vialle, BRC, OMVL, Zavoli, Eurogas, Bi-Gas, Romano, Tartarini, Landi Renzo, KME, Stefanelli, Necam, Koltech, LPG Tech, Altesa, Stag, E-Gas, Lima, Impco, Mercury, AG, GSPK, XL-R8, Star Gas, Leonardo, Emma-Gas, Bedini, Lovato, Calor, Calorgas, Autogas, Icom, Valtek, Majic, AEB, Stako, GWZM and Pharos.


North West England:

CRD Performance – Burnden Industrial Estate, Manchester Road, Bolton, Lancs, BL3 2NG

Tel: 01204 529 529 – Website:

We are currently in the process of appointing dealers and setting up a dealer network. Details of all successfully appointed dealers will be posted here soon.

In the meantime, please contact us directly if you would like to arrange a demonstration or installation.

Send a message to CRD Technology

CRD Technology Limited, Burnden Industrial Estate, Manchester Road, Bolton, Lancs, BL3 2NG


Select-A-Map Retail Brochure

View Brochure Online
(Opens in a new window)
Download Brochure
(PDF format – 1,562 KB)
Printer-friendly version
(PDF format – 923 KB)

Select-A-Map Dealer Brochure

View Brochure Online
(Opens in a new window)
Download Brochure
(PDF format – 3,988 KB)
Printer-friendly version
(PDF format – 2,174 KB)


We are currently setting up a network of approved specialist installers who are well respected in their area, have a quality and professional image with an established Website and good range of suitable diagnostic equipment, and of course the appropriate skills. A rolling road dynamometer would be an advantage but is not essential.

Only people who can tick most of the following requirements would be considered as one of the first people to win this fantastic opportunity to increase their business, with this exciting new and unique product.

  • Probably an established Superchips, Revo or similar remap product dealer.
  • Performance enthusiasts with a proven track record selling performance products.
  • Common rail diesel engine diagnostic experience.
  • DPF operation and problems awareness.
  • Experience of writing and installing maps.
  • Fleet contacts.

Consideration would be given to suitably experienced mobile operators with the appropriate equipment and skills.

Although the Select-A-Map ECU works on most common rail diesel engines, regardless of age, our initial prime target markets in the UK are vehicles still under manufacturer's warranty and probably up to 3 years old, plus fleet customer's cars, vans and LCV's up to 3.5 tonnes.

There are also opportunities for HGV's.

If you would like to apply to become a dealer, please contact us.

Dealer information and prices

To gain access to dealer information and prices, please fill out the registration form, selecting the 'Request dealer access' option. You will receive your login details immediately and, if your registration is approved (usually within 1-2 days), you will have access to dealer areas of this website.

Select-A-Map - Diesel Remap ECU

The world's most advanced diesel performance computer

The SELECT-A-MAP Diesel Control ECU is a new generation, diesel control computer that is undoubtedly the most sophisticated and advanced tuning product available anywhere.
Click here to view or download the brochure

A complete fuel remap with all the convenience of a tuning box

Select-A-Map ECU The Select-A-Map ECU is quite simply a revolution in vehicle remapping. It combines most of the benefits of a conventional diesel ECU remap with the ease of installation of a diesel tuning box. It is designed to be highly universal, making it compatible with most common rail diesel engines and it contains a host of other features not found in any other product.

The only non-intrusive remapping solution

Using patented technology, developed in the UK by the fuel injection experts at CRD Technology, the Select-A-Map ECU allows your vehicle to be remapped without cutting wires or making any modification to your vehicle's ECU. This not only makes for a quicker installation time, but also makes transferring to another vehicle possible and greatly reduces the risk of invalidating your vehicle's warranty.

Select-A-Map System Diagram – Click to Enlarge
Select-A-Map Block Diagram
Click here to view or download the brochure

Power, speed and accuracy

To maintain engine efficiency and reduce the risk of Diesel Particulate Filter blockage, it is imperative that any modifications to the quantity of fuel injected are precisely metered and timed. The Select-A-Map ECU achieves this by accurately monitoring fuel rail pressure as well as injector opening times, using a unique, non-intrusive injector sensing method. It performs many millions of calculations per second, enabling it to compute engine speed and load values instantly so that the exact quantity of fuel required is always injected at exactly the right moment.

Advanced Features

Using the same principle as a professional ECU re-map to create a mirror image of the vehicle's own ECU fuel map, the SELECT-A-MAP creates 5 different maps that are instantly switchable using the remote key fob with the ignition on or engine at idle. Select-A-Map Remote Control Key Fob

1) Standard Map

Standard torque and standard power.

2) Economy Map

Increased torque and standard BHP to enable optimum economy – Can be refined to operator's specific requirements.

3) Fast Road Map

Increased torque and increased BHP for everyday driving, while retaining good driveability and improved economy, with no adverse effect on DPF.

4) Very Fast Road Map

Tuned to give the highest Torque and highest Power for occasional fast road or track day use.
Note: Prolonged use of this map could result in more frequent DPF regeneration and, since it provides uncompromising levels of performance, fuel consumption will likely increase.

5) Reduced Power Map

Low Power or 'Valet' option enables already powerful cars to be used by less experienced drivers.

Any of the predefined maps can be used as is or, as an optional extra service, the installer can further refine any map* to suit individual requirements.

No single map is right for every purpose. Vehicle manufacturers are forced to compromise by producing a map that meets emission regulations while providing acceptable economy and performance.

ECU re-map specialists experience similar problems when working with a single map; improvements can be made in some areas but never in all areas.

By offering 5 customised, instantly switchable maps, it is possible to provide an uncompromising solution that can be tailored to suit any purpose and every customer.

Some re-mapping companies offer customers an optional OBD handset that allows switching between 2 maps, but this procedure can take several minutes to perform and carries a risk that a data error could render the vehicle's ECU inoperable.

A specific map can be selected as the default map to revert to at power-up/ignition-on. For example, it may be preferable to always start the vehicle with a standard/100% map or, for added security, a reduced-power or ‘valet mode’ map. Note: One exception to this is Map 5 which, when selected, remains selected, regardless of any default map settings or ignition status, until a different map selection is made.

* Additional mapping costs may be charged.