[Proj] Datum shift not working

[Paul Boettinger]

Hello,
i want to do a transformation with the EPSG Code 3440
In my epsg file 3440 references the following parameters:
+proj=utm +zone=40 +ellps=clrk80 +towgs84=-180.624,-225.516,173.919,-0.81,-1.898,8.336,16.7101 +units=m +no_defs

Executing proj 4.8.0_0 from the MacPorts Repository on OSX 10.9.4 makes no differences using the transformation with or without the datum shift.
Any help welcome,

Paul

proj +proj=utm +zone=40 +ellps=clrk80 +towgs84=-180.624,-225.516,173.919,-0.81,-1.898,8.336,16.7101 +units=m +no_defs -f "%.6f"
59.28632619 24.27334106
732098.167370	2686171.824604

proj +proj=utm +zone=40 +ellps=clrk80 +units=m +no_defs -f "%.6f"
59.28632619 24.27334106
732098.167370	2686171.824604