Quote:
Originally Posted by Dr. Acula
JFP, have you found any benefit to a low temp thermostat in the 9A1 engines?
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The 9A1 engines do not use a simple thermostat like the M96/97, they have a more sophisticated "thermal management system" which is electronically controlled. Would they benefit from running a bit cooler, sure, but how to do it becomes the issue.
From Porsche literature on the subject:
"The required changes to the engine consist of a single-slider map-controlled thermostat and a shut-off valve in the bypass circuit. The separation of the functions of coolant temperature regulation and bypass circuit shut-off offers advantages in temperature regulation and permits a heating boost in the warm-up phase with a weight-optimized design. The system in the basic engine consists of only 3 additional components(shut-off valve and bypass line with tube). With thermal management, the coolant throughput through the engine is completely suppressed by closing the shut-off valves in the early phase of the warm-up. This leads to faster warm-up of the cylinder head and liner. In the second phase, the shut-off valve is opened and the engine oil and transmission oil are warmed directly, reducing friction. "