Increased Power

Increased Torque

More Exciting Driving

ECU Remapping

To manufacturers tuning is a often a compromise. We rewrite or ECU Remap the vehicles engine software to safely gain more power and torque. This gives improved driving experience and the bonus of enhanced fuel economy on diesel engines.


How it works and benefits

By reading and altering the stock map that was extracted from the ECU’s memory, the full performance of the engine can be unleashed. This is done by changing factors within the map such as the pressure level of fuel, torque distribution, throttle control and more.


ECU-Remapping will boost both the power of the engine and the torque, as well as expanding the power band and a more nimble throttle response. With a wider torque window, the power delivery with be more linear delivering a more exciting drive. Manufactures restrict the power of the vehicles to meet with certain rules and regulations but it is completely legal to remap the ECU to expose the extra power and torque that was sealed away.


Another massive advantage of remapping is the improvement in fuel economy. By having increased torque throughout the entire power band, the engine doesn’t need to consume as much fuel as it takes less throttle input to keep a steady speed than before.


What does Electronic Control Unit remapping do?

As mentioned above, remapping allows you to alter the performance of your vehicle by altering how the engine drives the car, however, it’s how the driver chooses to use the tuned car that ultimately decides what effects the ECU tuning will have.


For example, it’s a common belief that remapping a vehicle has no effect on fuel economy, however, this technically isn’t true. As the result of ECU remapping, a car usually sees an increase in power, which can come at the expense of higher fuel consumption.

Owners will often drive their cars more ‘enthusiastically’ after remapping, accelerating quicker when possible to enjoy the noticeable difference in output their car has, and therefore, further increasing fuel usage.


On the other hand, if the driver chooses to change their driving habits to make the most of the increased power and torque throughout the ‘rev range’ and gear changes, then fuel economy can be improved. It really comes down to how the driver chooses to use the tuned car which decides how economic it becomes. Remapping a vehicle can also have an immediate effect on speed and power; in some cases, remappers claim to have increased horsepower by 30-40bhp, and torque up to 80nm!


A car’s engine can also become more responsive, allowing the driver to overtake more easily. This can also cut down on the number of gear changes the driver has to make, allowing them to handle situations that require more torque without dropping down to lower gears. Again, this can help boost fuel economy if used strategically.

Petrol and Diesel Engine Benefits

Petrol Engine Benefits

  • Increased horsepower
  • Increased torque
  • Better throttle response
  • Smoother power delivery
  • Safer overtaking

Diesel Engine Benefits

  • Increased horsepower
  • Increased torque
  • Better throttle response
  • Smoother power delivery
  • Improved fuel economy
  • Safer overtaking

Balanced – The perfect mixture of power and economy


Unlocking the full torque and power ranges in effectively all turbo diesel engines to give a fantastic driving experience, altering the torque distribution for a more optimal power delivery throughout all rev ranges, all while providing enhanced fuel consumption.

Economy – More miles out the same tank


Designed for the sole purpose of improving fuel economy on turbo diesel vehicles. Modifying the engines torque limits at lower rpm will allow the car to gain better economy whilst still providing better performance. The Economy map is programmed to always keep your engine at the optimal window for maximum fuel efficiency, this is achieved by encouraging gear changes to ensure you stay within the optimal zone. Immensely popular amongst taxi drivers and long distance drivers, where saved fuel is profit.

Performance – Unleash the full power of your engine.


Made for when you require every last drop of power out of your car. Available for both petrol and diesel engines, sharpening up the throttle response combined with a more optimised acceleration. The Performance map provides an unparalleled driving experience, just what every car enthusiast loves.

Should you remap your car?

Many people might wonder ‘Is remapping a car good or bad?” As with all car modifications and maintenance, remapping a vehicle does come with risks and downsides, so it’s worth bearing these in mind before you decide to go ahead with the process.


There are two primary reasons for wanting a remap, and they’re called power and torque. When your car left the factory there’s a very good chance its performance was deliberately muted in order to meet product planning objectives or economy and efficiency targets. These days the power and performance of most cars is limited, not by any particular mechanical factor, but by the software running in the engine control unit (ECU).


Computer algorithms running behind the scenes while you’re driving a modern car affect all sorts of parameters, such as ignition timing, air/fuel ratio and turbocharging boost pressure.

So if you want greater performance and pulling power from your car, or alternatively if you’re seeking mpg improvements, the first place to look is the little black box under the bonnet.


Here at Auto Express we receive plenty of emails asking advice about ECU software changes, and we’ve compiled this guide to explore the pros, cons and costs. Chipping turbo diesel engines can increase economy by seven to 10 per cent, because it adds torque lower down the rev range. This means the engine doesn’t have to work as hard as before.


It’s these turbo diesel engines (often known as TDI, HDi, CDTi depending on the manufacturer) that are cornerstone of the car chipping industry because an engine chip or software upgrade can cheaply add so much to the performance.

Frequently Asked Questions

There isn’t much point having a remap unless everything else is in good condition as it will detract from the positives you will see from the remapping process, so it’s a good idea to get your vehicle checked over first before you go ahead with the remap

It’s important to remember that not all cars can be remapped, usually due to their age. Typically, cars produced before 2000 are too old and don’t feature the car remapping software needed to optimise the vehicle’s performance.

Chipping and remapping are both methods used for improving a car’s performance. Much like the inside of your laptop or mobile phone, an ECU comprises a motherboard and microchips. While remapping changes the software that the unit runs, ‘chipping’ involves physically replacing the main computer chip with a new, pre-programmed one.
Chipping is a more risky process than remapping as it requires the mechanic to open the engine control unit, leaving it vulnerable to damage. Since OBD ports became mandatory in Europe for petrol cars in 2001 and diesel cars in 2003, ‘chipping’ is usually saved for models that pre date this era.

Depending on what your requirements are and your driving style depends on what your fuel economy will be. If you go for an outright maximum power output and drive it as so, you can expect to see it decrease as it would without the map. If you get the map to increase torque low down and drive conservatively then it is likely that fuel economy will increase. Please note that fuel economy gains are only likely on turbo diesel engines, petrol engines generally stay the same with some reporting slight improvements, never a loss.

The beauty of the remap is that this process is completely reversible without any trace; therefore if within 14 days you want it changed back, we will carry it out free of charge with a full refund. If after 14 days you wish to reverse it then there is a £50 call out charge for the process but no refund will be given unless otherwise agreed prior to the 14 days elapsing.

No one can say for 100% certainty that the remap will be undetectable. However, the modification to the software will not show up on any main dealer diagnostic equipment and therefore unless you tell them that it has been done, they will be none the wiser.

Remapping may increase your insurance premium, but you can find a good deal by using a specialist insurer like Adrian Flux, who offer insurance tailored for owners of modified cars. You must declare that your car has been remapped regardless of the insurer you choose (or your policy could be invalidated). Driving your car after its been remapped will feel different. Most drivers will adapt after a few trips in a freshly tuned car, but for some drivers may not enjoy the new driving experience as much as they had hoped. Thankfully, remapping is completely reversible!

If you have a fairly new car, one of the biggest downsides is that remapping your engine will most likely invalidate the manufacturer’s warranty. You could remap your car once your warranty expires, or you may be willing to take the risk – it’s up to you. It is possible for your engine to be damaged by remapping, but the chances of this happening are very slim. However, most reputable re mappers will offer a lifetime warranty on the software they install on your ECU anyway.

Completely Now, while there is extra performance available from the engine, this isn’t the only benefit. As long as you’re willing to drive normally, then you can also get an increase in MPG. It depends on the vehicle, but some people report up to 5 MPG more after remapping, so if you do enough miles then you can recoup the money that the remap costs. You have to remember that a heavy right foot will still use fuel, whether it’s remapped or not!

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