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Has anyone else monitored the coolant temperature on a 987/987 with an actual scan tool, and noticed that it does vary just like the older cars, but the gauge does not move.
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Yes, I do it most everyday with an Autologic as I do my 86 mile test runs in customer's cars. Just did it this morning in an 08 Cayman S with my 4 liter package. I have also quantified the values using analog instruments and my 28 channel data logger with all stand alone sensors as well as OBDII channels. What I note is the coolant temps of the post 2006 engines runs substantially cooler than the older cars and though it may vary all the values are lower when compared to similar engines one generation older.
This is how we developed the lo temp T stat for LN in 2007. In temperatures as low as -27F heater performance wasn't an issue with the LN T stat. For a 1,000 mile trip the warmest conditions that were experienced were in the mid teens F. If the heat was reduced it wasn't enough to cause any issues or discomfort.
As I continue to develop Cayenne engines at elevated displacements and solving cylinder wear issues with them we are finding the same things as we noted with the M96. The dynamics of the thermostat housing changed dramatically with the 9a1 DFI flat six and now at 4.2 liters we ave learned just how far we can push them before mods need to be made and now I am developing those mods.
This is a pic of a factory bore from a 2012 Cayman R with 4,400 miles on it that I disassembled as a base for my 4.2 build. All the cylinders were this worn at 4,400 miles with zero track time. Welcome to the next generation.
Here is another cylinder on the opposite side of the engine.
Back on M96s, we tore this 27K mile factory Porsche crate engine yesterday as it sounded like it had bad lifters, but it didn't. The noise was a toasted cylinder and piston that was rocking at mid-bore and creating the ticking sound.
Here is the piston
And its cylinder
