How to modify cis warm up regulator?

[John Larson]

It's not the CP regulator (AKA "warmup regulator" in layman's terms) you
want to modify.  It only operates until the engine is warmed up.  You need
to increase the pressure in the fuel distributor.  The real way is to change
the shims in the relief valve.  Shims are available in little kits, but I
haven't seen a kit in years.  You can get some out of old FDs.  There is
always the option of using a CPR that has a vacuum function to drop the CP,
but I don't know how that would work with a turbo and it's pressurized
intake tract.  HTH, John