Frequently Asked Questions


Our technicians connect to the vehicle’s ECU or ‘brain’ with a laptop PC via the OBD (Onboard Diagnostic) socket, to take a read of the engine management file. This is then uploaded to our files team, who optimise the code and send it back to the dealer technician to reprogram the ECU. On some vehicles it is necessary to physically remove the ECU so that it can be programmed on the bench. Tuning via OBD normally takes around an hour, on the bench slightly longer. The work can be carried out at one of Quantum’s offices, dealer premises, or at your home or place of work depending on location.

Quantum remapping enhances and optimises the power of the engine within safe limits. We are taking up the slack of the high tolerance level that vehicle manufacturers always build in – often to ensure that warranty claims are kept to an acceptable minimum. A good remap from a file writer who understands the strategy within the ECU will not allow the engine to get close to component failure.

Note that quality tuning companies offer very similar gains – so be wary of some with a lesser reputation, who appear to offer enormous power increases. In reality these claims are either simply untrue, or they are programming the ECU well outside of safe operating parameters. Every vehicle has a mechanical limit to the amount of power it can produce, so if it sounds too good to be true it generally will be.

Most race and rally engines are pushed for every last bhp, and thus they more common to fail, whilst normal car/van/lorry engines are limited back, well away from probability of multiple failures. Each individual engine is different as in how much it can be pushed in a remap, but a good remap from a quality ECU tuner will never get close the limits of component failure.

A manufacturer cannot risk selling a vehicle on the very edge of performance, so engine management calibration is a compromise: it has to take into account regional differences for fuel quality and operating conditions.

The way an engine delivers its power and driveability is also subject to sales and marketing constraints, to ensure it is portrayed in the best light possible when compared to its rivals. Marketing departments within the big vehicle manufacturers wield a surprising amount of influence; if they demand that a torque curve should look a certain way because they believe it gives them a sales advantage, they tend to get what they want – despite realistic opposition from those who actually calibrate the car.

An engine that is running from a Quantum map will not suffer any reliability issues provided it is well maintained. In the highly unlikely event that there is a problem we will look to resolve the issue should it be determined that it was caused by the upgrade. We offer a 30 day money-back guarantee in the event that you are not satisfied with the conversion.

We are very confident that your Quantum remap will improve your driving experience and give you fuel savings. But don’t take our word for it: try the upgrade for 30 days and if you are not delighted with the results we will take it off and give you a full refund.

We advise that it is your responsibility to inform your insurance Company of any modification to your vehicle. We are finding that more and more insurance companies are not penalising their customers for saving fuel and recognise our economy upgrades. We can provide a certificate of conformity if required.

Some diagnostic equipment may detect a remap, although some forward-thinking manufacturers turn a blind eye to a quality conversion.

The official line from most manufacturers is that if a modification causes a problem with the vehicle, then the part of the vehicle affected will not be covered; but this does not mean that they can disregard the entire warranty. If, for example, your vehicle’s central locking system failed, they would not be able to void the warranty because of the remap.


If you are concerned, ask us about our fully comprehensive Quantum Warranty option that can offer even more coverage!

These interfere with engine management signals to trick the injectors into adding more fuel, relying on the principal of more diesel equating to more power… which is correct, it does increase a diesel engine’s BHP. Crucially though, there is no control over the amount of black smoke coming out of the exhaust, and no thought is given to how other vital engine management systems are affected.

Too much smoke is undesirable, both environmentally and visually. The black smoke is unburnt diesel fuel with deposits exiting straight out of the exhaust pipe. This results in raised emissions, a higher thermal load on the engine, and poor driveability – with “bucking” a common problem. It is clear what this means for your engine.

Because a diesel box operates independently from the other – increasingly complex – engine management systems, the results of using one can induce undesirable results, such as:

  •  The trip computer showing improved fuel consumption, when the reality is entirely the opposite
  •  The stability control system’s calibration is affected due to incorrect torque values being applied
  •  Loose boxes and wiring left within the engine compartment
  •  Automatic gearboxes receive incorrect torque values
  •  Torque reduction when shifting gear (for comfort and durability) not retained
  •  Diesel particulate filter regeneration is adversely affected
  •  The calculation of exhaust gas temperature is incorrect
  •  The calculation of service intervals is incorrect
  •  Diagnostic systems can bring up multiple error codes
Scroll to Top