Normal oil temperature range during steady highway driving
#16
Rennlist Member
When my ballast resistor failed, the temp had to climb significantly (way too high, but never in the red) for the fan to kick on. I only realized this in stop and go traffic. I now have the ballast replaced and a manual fan override switch installed. Guess I'm paranoid about the temp getting too hot now.
Point is, if your ballast resistor has failed, the symptoms are far different than what the OP is experiencing.
Point is, if your ballast resistor has failed, the symptoms are far different than what the OP is experiencing.
#17
#20
Instructor
Thread Starter
Hey guys, thank you so much for the discussion! I checked the blower resisters, and they are all functioning properly. It sounds like expected fluctuation in 55-70ºF ambient temperature.
#21
On a more serious note - glad the resistors checked out ok.
#22
Instructor
Thread Starter
#23
Rennlist Member
The engine undertray has a significant impact on my engine's temperature stability.
Without it, the car takes forever to warm up, and it mostly runs cool like yours while moving.
I am guessing that yours has also been removed?
Without it, the car takes forever to warm up, and it mostly runs cool like yours while moving.
I am guessing that yours has also been removed?
#24
Three Wheelin'
Hi folks, I drive about an hour from SF to the South Bay on the scenic 280. Even when I'm not in the colder part of the highway, I've noticed my temperature rising and falling from about the 1/3 mark down to about 1/6th. I've always wondered if it's okay for my oil temperature to drop so much during a drive. Could a thermostat be failing? It's about 55-65ºF here.
Here's a photo of the indicator level when it drops to about 1/6.
Here's a photo of the indicator level when it drops to about 1/6.
#25
Instructor
Thread Starter
I'm somewhat uncomfortable not having the undertray. I want to say that I trust Porsche engineers more than car "hackers" because third parties don't have all the information about what motivated engineers. Perhaps sound regulation is just one of several factors. For example, I have to be mindful revving hard after getting on the highway because my temperature drops to 7/7:30 after being at 8 on the onramp. Maybe the undertray reduces engine wear in the long run?
Did the undertray design ever change for 993? If it had all the shortcomings people ascribe to it, Porsche had plenty of time to address them in the lifetime of the model.
#27
#28
Three Wheelin'
Yes, it has been removed. There's a lot of talk about why it's bad to have - oil pooling, leaves, temperature - but I work on consumer products and I know how much engineering goes into decisions like that, and how little the public understands about internal engineering decisions. What may seem like a dumb design may actually account for non-obvious edge cases.
I'm somewhat uncomfortable not having the undertray. I want to say that I trust Porsche engineers more than car "hackers" because third parties don't have all the information about what motivated engineers. Perhaps sound regulation is just one of several factors. For example, I have to be mindful revving hard after getting on the highway because my temperature drops to 7/7:30 after being at 8 on the onramp. Maybe the undertray reduces engine wear in the long run?
Did the undertray design ever change for 993? If it had all the shortcomings people ascribe to it, Porsche had plenty of time to address them in the lifetime of the model.
I'm somewhat uncomfortable not having the undertray. I want to say that I trust Porsche engineers more than car "hackers" because third parties don't have all the information about what motivated engineers. Perhaps sound regulation is just one of several factors. For example, I have to be mindful revving hard after getting on the highway because my temperature drops to 7/7:30 after being at 8 on the onramp. Maybe the undertray reduces engine wear in the long run?
Did the undertray design ever change for 993? If it had all the shortcomings people ascribe to it, Porsche had plenty of time to address them in the lifetime of the model.
#29
Instructor
Thread Starter
I agree. I bought the car this way. I'll get an undertray and see how things change.
#30
Rennlist Member
Yes, it has been removed. There's a lot of talk about why it's bad to have - oil pooling, leaves, temperature - but I work on consumer products and I know how much engineering goes into decisions like that, and how little the public understands about internal engineering decisions. What may seem like a dumb design may actually account for non-obvious edge cases.
I'm somewhat uncomfortable not having the undertray. I want to say that I trust Porsche engineers more than car "hackers" because third parties don't have all the information about what motivated engineers. Perhaps sound regulation is just one of several factors. For example, I have to be mindful revving hard after getting on the highway because my temperature drops to 7/7:30 after being at 8 on the onramp. Maybe the undertray reduces engine wear in the long run?
Did the undertray design ever change for 993? If it had all the shortcomings people ascribe to it, Porsche had plenty of time to address them in the lifetime of the model.
I'm somewhat uncomfortable not having the undertray. I want to say that I trust Porsche engineers more than car "hackers" because third parties don't have all the information about what motivated engineers. Perhaps sound regulation is just one of several factors. For example, I have to be mindful revving hard after getting on the highway because my temperature drops to 7/7:30 after being at 8 on the onramp. Maybe the undertray reduces engine wear in the long run?
Did the undertray design ever change for 993? If it had all the shortcomings people ascribe to it, Porsche had plenty of time to address them in the lifetime of the model.