jwp98

Anyone know why the oil temp goes down rather than up in sport mode? I know there are 7 oil pumps, and at least two each of radiators and intercoolers, not sure about oil cooling schemes. Maybe another mechanism or flow rate kicks in during sport mode? The difference is abrupt and consistent, about 25 degrees F (230 to 205). It has nothing to do with speed, rpm, or driving style.

LexVan

Same thing on the NA 991s. I just think it's the oil thermostat going to a full open position.

Tifosielia

I can at least tell you why today's cars run between 220-250 degrees. Its an emissions/efficiency based thing, having the motor between 220-250 is the optimal temperature for the lubricants and also has emissions benefits. (exactly what they are I honestly forget). But i do remember a brand new Nissan that was putting out too much NoX, wouldnt pass emissions and no one could figure out why, Turns out the thermostat was defective and opening far too soon. New Thermostat and off it went.

Obviously this ins't ideal for sporty driving, many people swap their thermostat for 186 variants in their track cars. Another example of forward thinking by Porsche.

NMM991

Ran my car (2800 miles) on a 150 mile trip today - 75 MPH, 88 degrees F outside, AC running. In normal mode the oil temperature ran steady a 234 degrees. Put it in Sport mode and then Sport + mode and the temperature went down to 205 degrees - had to put the car in 7th gear manually since at 75 MPH the car downshifted to 6th gear in automatic. Did not see any difference between Sport or Sport +. Suggest the thermostats open up in those two modes anticipating hard driving, but also agree that in Normal mode Porsche is trying to reduce emissions by getting more complete combustion.

jwp98

Thank you. Makes sense. (Assuming oil temp is good surrogate for block and exhaust temp---I have no idea but in a VTG car the ECU surely knows).
In the aircooled cars oil played a huge roll in cooling, probably less now. The valve is probably closed for warm up in either mode.

allans

Different speeds, but same kind of change with mine. Allan

NVRANUF

Huh, learn stuff all the time in here.



pic on left was in normal drive mode, switched to sport and 10kms later, still at hwy speed, the oil temp drops by 12C!!

NMM991

Given that we are all experiencing the same oil temp drop, I think we can assume that the system is running as designed.