Quote:
Originally Posted by HRTROB
Went to the track today. My oil temp reached 127C (260F). At that temperature, oil pressure was always less than 3.0 bar across the rev range till redline. I set my oil pressure gauge to beep when pressure drops below 3 bar. It was beeping almost the whole time while lapping. It would sometimes drop to 2.5 bar (36 psi) during gear changes or at the corners. Definitely not good. I'm already running 5w30.
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I'm seeing pretty horrible oil pressures also when the oil is very hot but better than yours as I run much thicker oil. The bottom line is that NA cars really won't have an issue and in fact most cars that make linear power (NA or supercharger) don't have the same demands a turbocharged application will. I would say 50 psi is probably fine on a 200-250 hp car and 60 psi up to 300 hp but after that it should be higher.
A turbo car produces torque much sooner so the demand for oil pressure needs to happen earlier and from what I've seen with this oil pump the pressure increases linearly when the oil is hot (cold the pressure is fine).
I do go into more technical detail here if any of you are interested to see what we are working with.
http://www.ft86club.com/forums/showthread.php?t=63723
For now I've backed off my power and I'm testing a few things. I will tell you that the oil port at the top of the block (where the AC is) has less oil pressure. Guess what though? That's your crank and rod bearing feed!!!!!!
Thanks,
Phil Grabow