You change or replace the map in the engine management system that manages fuel/air mix.
You tend to find most engines have a stock and safe map as they stick it on thousands of engines.
But each engine will be very slightly different so you can customise your map to your own engine and get rid of flat spots in acceleration or save mpg or whatever you want.
You tend to find most engines have a stock and safe map as they stick it on thousands of engines.
But each engine will be very slightly different so you can customise your map to your own engine and get rid of flat spots in acceleration or save mpg or whatever you want.
David M
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I don't bother with my van since its an old Merc. But funnily enough my Golf TDI is going in this coming Tuesday to be re-mapped. The cost will be around £250 - £300 
My mate had his done recently and reckoned the bhp was improved from 110 to just under 140 and it also has improved the mpg. I'm a bit skeptical on the mpg bit as by my old school logical thinking is - more horse power means more fuel consumption. But according to him the standard mappings are set to meet EU emissions legislation. As its been in the press recently about VW fudging their emission results, it would not surprise me if my mate is indeed correct. So he's convinced me to take the plunge and foot the cost as he reckons it will be worth it in the long run.
My mate had his done recently and reckoned the bhp was improved from 110 to just under 140 and it also has improved the mpg. I'm a bit skeptical on the mpg bit as by my old school logical thinking is - more horse power means more fuel consumption. But according to him the standard mappings are set to meet EU emissions legislation. As its been in the press recently about VW fudging their emission results, it would not surprise me if my mate is indeed correct. So he's convinced me to take the plunge and foot the cost as he reckons it will be worth it in the long run.
Your mate is right.
The 110's do go to about 140. And you will get either the same mpg or slightly better. Sounds like a bhp-orientated map that though you can get one to take it to about 120 and a lot more mpg than stock.
www.bvrautomotive.co.uk is our local VAG mappers and I think they have a calculator on their website if you want to take a look.
The 110's do go to about 140. And you will get either the same mpg or slightly better. Sounds like a bhp-orientated map that though you can get one to take it to about 120 and a lot more mpg than stock.
www.bvrautomotive.co.uk is our local VAG mappers and I think they have a calculator on their website if you want to take a look.
It'll take 100 miles or so to bed in. So keep that in mind. As your management system will need to relearn your driving style and adjust a bit. So make sure you don't just give it beans but also don't just tootle around like a granny.I'll let you know my honest opinion when after its been sorted on Tuesday. Obviously it will take a few weeks to determine if the fuel consumption has changed in anyway.
I'll also try and get some info from the fella who is doing it for me.
Just as an aside to that . The old 1600 ford Cortina did less MPG than the two litre. It is a case of more right foot to keep them pulling.
It is a power to weight ratio that is the ideal balance.
Then as Tel has said, when you have that it is down to the right foot.
It is a power to weight ratio that is the ideal balance.
Then as Tel has said, when you have that it is down to the right foot.
Well you have a point .
ECUs can be very temperamental. Best left to the experts. So many things can affect their parameters.
It's not quite that technical. I've had a few fast scoobies and evos and I'd get them remapped whilst driving around to give a real custom map. Every time I changed a part. It'd never be the ECU that would blow, itd be a turbo or bottom end lol
But you're safe with these fairly stock maps.
On vag 1.9 and 2.0TDI engines there's a limit people go before they say it's a race map and will make you sign somebody to say it's on your head.
Otherwise if you're not happy with it; most keep your actual map before they wipe it and can put it back on. Usually FOC too.
The trouble is there are not many experts out there when it comes to the electronic boxes vehicles seem to be filled with
Too many times vehicle techs have a replace everything attitude rather than an ability to interpret the fault codes and analyse the source of the fault
I will have have to take your word for it .
I know a few wizards that have come unstuck playing about with there ECU.s
I suppose professionally done they will be ok.
I honestly though though you just meant upgrading in bog standard models , not souping them up to race standards.
I know a few wizards that have come unstuck playing about with there ECU.s
I suppose professionally done they will be ok.
I honestly though though you just meant upgrading in bog standard models , not souping them up to race standards.
Messing about with the mapping of your engine can affect your insurance.
Here is one a mate of mine spent a lot of time from his life building from scratch
View attachment 33317
If you're running an engine that doesn't require breaking into the ECU to remap you're fine.
I had, in a 2014 VW Amarok, a gizmo that plugged in (and stayed plugged in) to the port, which I then controlled with an android phone, to increase or decrease BHP. And if I did write it off, as it unplugged it would cancel out the commands to the ECU so wasn't trackable.
There was also another gizmo that was a mechanical change which you plugged in the wiring before the ECU but if you wrote it off and it was totalled it could be found no doubt.
I had, in a 2014 VW Amarok, a gizmo that plugged in (and stayed plugged in) to the port, which I then controlled with an android phone, to increase or decrease BHP. And if I did write it off, as it unplugged it would cancel out the commands to the ECU so wasn't trackable.
There was also another gizmo that was a mechanical change which you plugged in the wiring before the ECU but if you wrote it off and it was totalled it could be found no doubt.
David M
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So, I have now got an update regarding the mapping of my Golf.I'll let you know my honest opinion when after its been sorted on Tuesday. Obviously it will take a few weeks to determine if the fuel consumption has changed in anyway.
I'll also try and get some info from the fella who is doing it for me.
I had the ECU re-mapped and the car performance increased quite noticeably. The running cost (fuel consumption) doesn't appear to have changed much, a touch slightly better but nothing significant.
But after a short period I started to have problems with the DPF (diesel particle filter) blocking quite quickly. This is a filter that is part of the exhaust system which basically cleans out the soot from the exhaust gas. The car is programmed to regenerate the filter, basically when the car gets to temperature the car's management system alters the fuel mixture and injects fuel in the exhaust so that the soot can be burned away at high temperature.
It turns out that my car had a faulty EGR valve (exhaust gas recirculating valve) which is also part of the exhaust system and is all linked in with the DPF and controlling emissions.
The car began to run terrible and I found I had to take it on a long run to clean out the DPF on a regular basis (at least once a week) to sort the problem. So after living with this for a month I decided enough was enough and got a friend of mine to see what he could do.
My options were:-
A. Replace both the EGR valve and the DPF (at a very high cost, in the thousands).
B. Have the car re-mapped again to omit the EGR valve & the DPF and modify the exhaust.
So a piece of advise, have the vehicle checked out first before you commit to performance modifications. Modern diesels, due to emission laws are a pain in the butt!
That could have happened anyway? Your egr valve went. I assume it was plugged in to check errors so wouldn't have been an issue during the remap. Cars are just cars.
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