If this is to do with cossies....

It is possible with extensive modifications and only the select few can do it on the factory ecu's.

However, if its only an ignition change you require,
the ignition is easiliy retarded for lower octane fuels by linking the octane connector.
This can retard the ignition by 2, 4 or 8 degrees depending on the car/ECU and chip fitted.
This will of course need proper testing with DET headphones on the new fuel
and also would probally require a boost drop to be safe too.


Oh and yes S8 does it !