"mark" wrote in message
...
I bought what is apparently the most powerful 1/2" drive impact wrench
available IR 2135 with 1000 ftlb or torque and am still finding it
weak. The other day it would not remove the bolts that hold on my
front brake caliper bracket and sometimes it wll not remove lugnuts. I
am using it at 125psi with 50' of 3/8" hose and 1/4" M (milton) quick
connects). Would going to 3/8" qc fittings help at all? I notived a
local tire shop has the air pressure at 150 psi. Is this what is
needed? How come air tools say never to go above 90 psi?


Probaby going to the 3/8 fittings would help some, but you have a high air
consumption tool there and though the pressure provided by your compressor
may be adequate likely the air flow output is not. I have an IR 231 I use
with a 2.5 HP compressor, and have had no trouble with any lugnut or
caliper bolt I've used it on. It works well on the relatively low cfm of my
compressor, much better than the cheapo CH one I had before it. Mind you,
I've used it on nothing bigger than the lugnuts of a 3/4 ton GM van.