Carpokes Porsche Forum

Tom wrote: Mon Jan 20, 2025 5:53 pm Definitely 7 ft lbs for the Carpokes tool! The factory 9201 tool spec for a new belt is 4.0 +/0 .3 (so 3.7 to 4.3).

The numbers on the factory 9201 tool are dimensionless. As I wrote in Panorama: "That factory P9201 measures tension on a scale from 0 to 9, but the numbers don't mean anything. They don't translate to any known scale. The gauge could have pictures of zoo animals instead, with the factory spec pegged at half past the bunny rabbit, and it wouldn't make any difference. As a result, even the best tensioning tools in the world are effectively worthless on the 944 without some way to equate their measurements to Porsche's specs."

The Carpokes tool is designed so that, with 7 ft lbs applied, the N arrow will line up with the water pump rail only when the belt has the amount of tension that generates a 4.0 on the P9201. 7 ft lbs was an arbitrary choice -- high enough to be fairly accurate/consistent on most torque wrenches, but not so high as to stress the plastic tool. It could have been any torque value really -- for example, I had an earlier version calibrated at 10 ft lbs -- the only difference was the arrow was smidge further to the right.