| Since blown two headgaskets on prior cars from overheating (including my 2+2), I've become a hawk at monitoring water temps. I posted last month about some before/after data-logging I'd been gathering with my H.I. Pulley and here are the rest of the results. It took longer to compile than I'd have hoped but the Z and weather didn't want to cooperate. For those unaware, the H.I. Pulley reverses the effects that aftermarket underdrive pulleys (ASP/Unorthodox/etc) have on our cooling system. Underdrive pulleys boost our performance but slow down the water pump. As a result, the system doesn't cool as efficiently as it did from the factory. The H.I. pulley brings your Z back to within original specs, as the results will show. Notes:
-Cooling system on the Z was identical through both sets of data. No air conditioning/heater was used.
-Boost levels were always the same between the two pulleys. I ran 12psi on all normal driving and 15psi (+race gas) for the canyon runs.
-Coolant temps were taken with a Techtom MDM-100
-Ambient temps taken with a digital thermometer (not the inaccurate climate control thermometer in the Z).
-Weather/Temperature/Traffic conditions were always as close as possible. The HI data was only used if the outdoor temps were the same or 1-2degrees warmer. HIPulleyTemps.XLS 
If anyone has any questions or if anything isn't clear, feel free to ask.
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H.I. Pulley Datalogging Results - 
00:02:22 08/07/07
