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ECU Remapping - How does it work?

We're sure you'll want to know the methods we use to tune or remap your car, van or motorhome. Before tuning your vehicle it's important for us to run through the procedure so that you'll know exactly what's happening and also get an idea for what outcome you're expecting.

First of all we check that your car is in good health and suitable for remapping. We often see cars with small issues which are not always picked up by normal servicing and MOT's. We do this by carrying out a diagnostic check to see if there are any fault codes stored in the ECU of the car, as this can help us quickly detect if there have been any problems with the running of the engine in the past. We also use diagnostic tools to log data variables on the car to make sure that the car running as it should be. After the diagnostic check has been completed we move onto a visual check of the engine bay, and sometimes also a smoke test to check the intake air system for leaks which may not be picked up by the diagnostic checks. Once the checks are completed we will advise if any problems are found, or if not continue with the remapping process.

If coming to our HQ in Crewe, Cheshire, customers can benefit from allowing us to put their vehicle on the rolling road (dyno). This also acts as another health check as we can use the rolling road to check the standard power and torque measurement of the vehicle before we start the remapping process.

The next step is to read out the contents of the vehicle's ECU using the correct tools and equipment. This can be done by employing several methods depending on the ECU and vehicle:

-By plugging into the cars OBDII socket

-By removing and opening the ECU and connecting to the BDM port

-By removing and opening the ECU and reading the ECU in boot mode

-By removing and opening the ECU and removing the EPROM chip(s)

   

When choosing where to have your car remapped it's important to check that the tools being used are genuine reliable tools, as there are many cheap Chinese clones on the market which do not work as well as the genuine ones. If the tool fails while writing the car this could mean a new ECU is needed (often costing over £1,000) and the customer is likely to be walking home or calling a transporter to pick the car up! It really is a case of buy cheap, buy twice!

After reading the ECU our engineer will modify this data in a specialist hex editor, always keeping in mind the mileage of the vehicle, the customer requirements and any additional modifications. At this point it's important for us to mention that 90% of remapping companies in the UK are buying sub-standard remapping files from unknown sources at the cheapest price available (to maximise their profit). We have seen examples of these remapping files (normally because we have to fix them because the car wasn't running right or the customer wasn't happy) and it's clear that the developer doesn't know how the ECU works. At More BHP all of our software is custom made in-house which separates us from the rest. By investing in the correct documents, researching and developing our software on the rolling road we are happy to supply the best software available. We pride ourselves by tuning the ECU in the correct way using the correct methods and using the maps for the original purpose they were intended for. In some cases we might not quite be able to achieve the figures "others" are claiming but we would much rather let a car go with a smooth power delivery  and safe parameters than risk harming your vehicle by chasing numbers.

Once the modified file has been made, we then write this file back into the vehicle's ECU. This is done with the same tool used for reading the car.

If the vehicle is on the rolling road then the remap is tested to see what power and torque is now being produced. While the vehicle is being tested our engineer is constantly logging the variables inside the car to make sure it's safe and the new parameters are working as they should. If any changes need to be made then our engineer will make them and write the ECU and once again test it on the rolling road. By using this method of tuning we are creating a custom tailor-made remap for your vehicle which can take some time (often 2-5 hours), but we guarantee the result will be the best available. A graph showing your car's power and torque before / after remapping is provided with your invoice. 

  

Tried, tested and custom remaps are available via our dealer network.

 

Featured Reviews
Rating:  
Audi A3 2.0tdi CR140
Tuesday, 19 January 2016  |  Martin

Had my car in for an dpf removal, egr delete, harcut limiter and launch control with a stage 2 map. The guys did a brilliant job and id recommend them to anyone!!


Rating:  
Skoda Fabia vRS now perfect
Friday, 20 November 2015  |  Oliver

Stage 1 remap fitted but the map was a little fussy with my car at first, took it in to the lads at more bhp and that day they gave it me back running perfectly!! True gents and quality professional service! Highly recommend to anyone


Rating:  
Seat Leon Cupra R
Wednesday, 18 November 2015  |  Sam

Awesome service, turned my car into an animal thanks guys