[xenon]

Originally Posted by Porscha!

50bhp that is a lot from messing about with some electrics, would why they aren't just set up to optimum performance from the factory?

Why is it more common for diesels to be mapped?

Because diesels are almost always turbocharged and therefore easier to get gains from mapping.

As to why the manufacturers don't do this it's because of the diversity of the market to which they are selling, the variablity of servicing and fuel worldwide. If they knew that all fuel was high quality, owners would service regularly etc they might up the output a bit.

An enthusiast owner who has his car mapped is likely to maintain it welll and perform regular lubricant changes.

It's also labour intensive to map cars individually. Think of it like blueprinting an engine in an MG - factory bits but they're not all built that way because it's not economical.