if i change this do i still get the same amount of resources per fuel just fater ?

No, the amout of resources will scale with the "Running time per fuel units" parameter.

just faster i ment , no idea how i wrote that 

If you use 60 sec instead of the default 120 sec per barrel. the excavator run time will be cut in half, but the resources at the output will also be half.

so if i wanted to cut the run time in half but keep the resources the same i would need to set them to 2x correct ?

yes. set the resource multiplier.
or if you use a resource gather plugin, check if you can set it there.