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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.

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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.

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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?

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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.

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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.

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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.