On Sat, 23 Feb 2008 08:37:42 -0800 (PST), Brent
wrote:

On Feb 23, 9:12 am, mark wrote:
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?

the tire shop does not likely run the tools at 150PSI but if the shop
has or had air lifts or air tire changers they might be operating at
150psi. at the tool ports there is likely a secondary regulator to
drop it down to 90 or thereaboutsbut the entire shop can be run off of
the single two stage beast and the branch line for the tools is
regulated down further than the primary machines


I never reduced the pressure on my impacts from the 150 shop line
pressure. Mine DID have a "power" adjustment that allowed me to dial
the wrench back for assembling, and dial it up for dissassembling.

The 1000 ft lb spec is instantanious torque, not average or mean
torque, and the high shock torque is what an "IMPACT" wrench is all
about. And yes, if a 1/2" wheel stud is severely rusted to the nut,
the impact WILL twist off the stud. So you punch it out and put in a
new one, with a new nut. That's how the job has to be done sometimes.

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