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Originally Posted by tvacc
Cruise control..
No...it really should not be. I have friends that converted Fords and such. If it is programmed into the ECU...as it is on the Fords...all you do is add the switch and connect to the harness. It is all done with the computer....
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Maybe your friends Fords were "drive by wire". With an ECU controlled throttle (2006 Elise), the computer could be re-programmed to add a cruise control. But with a mechanical controlled throttle, something has to move it besides your foot. Since it can't be controlled by the ECU, a cruise control unit would have to be added (additional hardware). Usually they use vacuum to control a diaphragm to "pull" on the throttle cable. The cruise control unit can be controlled by the ECU, but it has to be done with hardware...