ECU Remapping in Wigston

What is actually being changed

The ECU holds maps, which are grids of numbers the engine looks up thousands of times a second. Given this throttle position and this engine speed and this air temperature, inject this much fuel, run this much boost, fire at this point. A remap alters those grids. It does not add parts, it does not remove anything, and it cannot make an engine do something the hardware was never able to do.

The reason there is room to change them at all is that the factory numbers have to be safe everywhere. Fuel quality we never see here, climates we never get, servicing that may or may not have happened. The margin left in the software to survive all of that is real, and on a modern turbocharged engine a fair part of it is available without touching a single component.

What we do is find where that margin actually sits on your specific vehicle and then use a sensible amount of it. Not all of it, not a figure somebody pulled off a forum, and not whatever makes the biggest impression when repeated back to a friend. The point of leaving some of that margin alone is that the engine still has to survive a cold morning in three winters' time. There is more general background on ECU remapping if you want to read up before you ring.

Why it is written for your vehicle rather than downloaded

Two cars of the same model and year can be in very different condition. One has a full history and a healthy turbo. The other has a slightly lazy injector, a boost leak nobody has noticed and an air filter that should have been changed last year. A file selected because the engine code matched treats both as identical, which is fine for one of them.

So the stock file is read out and archived first, then the engine gets logged on the road so we can see what yours is genuinely doing under load. The changes are made against that picture, and then the vehicle is driven and logged a second time to confirm the result. That second log is the part that separates a map from a hopeful guess, and it is the step most often left out.

It is also how problems get spotted. A car pulling nicely but running hotter than we want in one part of the rev range is something you find by measuring, not by assuming. If we find that, we tell you, and the map gets adjusted rather than left as it is.

Insurance, warranty and putting it back

You need to declare it. A remap is a modification in exactly the way a suspension change or a set of wheels is, and it belongs on the policy. Most insurers deal with it in a couple of minutes without any fuss at all. The only situation where it becomes expensive is when nobody was told and it comes to light while a claim is being assessed.

Warranty, lease and finance agreements all deserve a mention at the enquiry stage. A manufacturer warranty can be affected if a fault is later traced back to the software, and lease agreements often carry their own conditions about modifications. Tell us where you stand when you ring and you will get a straight answer rather than a shrug.

The original calibration is kept in every case, so the vehicle can be returned to factory software at any point. That is a short job. People ask for it before selling, at the end of a lease, and before a dealer looks at anything, and there is no awkwardness about requesting it.

Getting to Wigston, and who else this page covers

Wigston is a shade under ten miles north east of the workshop in Lutterworth, with Leicester three and a half miles beyond it. That makes it one of the more straightforward places for us to reach and it means timing is usually easy to arrange. You are looking at somewhere between an hour and an hour and a half at the vehicle.

The same page covers South Wigston along with Kilby, Kilby Bridge, Arnesby, Foston and Wistow. Oadby is a mile and a half away and has its own page, as do Blaby and Whetstone within three miles. If you run a van rather than a car, what it wants from a map is different, and van and commercial remapping in Leicester explains why.