I think that the Roadster has had 3 different engines in its run so far.
First was the Ford ST220 3.0 litre. When it was installed I am told that some Ford technicians spent several days at Malvern re-mapping the ECU to optimise for the very much lighter weight of the Roadster compared to the Mondeo, Jaguar S type and other more "normal" users of this power plant. As result the mapping was pretty well done and there is little to be gained from a re-map.
The issue with this engine was relatively high emissions of CO2
Second was the Ford Escape engine also 3.0 V6 , this had much lower emissions, but unless someone can correct me , I understand that it was not fully optimised into the Mog compared to the previous set up, and hence a re-map can prove to be more beneficial.
Lastly we have the current Ford Cyclone engine, about which I really do not have any data concerning the ECU, other than it comes from a more "sporty" car (Mustang compared to a Mondeo)
As Colin says, some owners are delighted after a re-map , others more equivocal, a dyno test can show differences of Power and Torque, but it can't measure drivability, and that is perhaps the most important result.
