Quote:
Originally Posted by Smallblock454
Do the OEM Porsche water pumps also have plastic impellers? Don't think so.
Thermostat: there is a downside you should mention when you use 80 degree thermostates. The fuel ratio is managed by the ecu. If the ecu thinks the engine isn't warmed up full it adds more fuel. That means more fuel consumption and maybe a little bit more power on the good side. On the bad side the engine oil gets thinned with fuel. I hope everybody knows what that means on the mid to long run and why i'm not a fan of that. Best would be to make shure the ecu thinks the engine is running at 90 degree celsius water temp - while it's running a t 80 degrees celsius.
Regards, Markus
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The OEM pumps use composite impellers only to prevent tearing up the engine cases.
There are absolutely
no downsides to running a 160F thermostat in these cars. Repeated tests (PIWIS, Durametric system) have shown that the DME maintains the exact same fuel trims as it would with the 186F stat, UOA's show absolutely no increase in fuel or water dilution, but also show that the oil break down under high temp/high shear conditions slows because the oil is running cooler. All pluses, no minuses.