Quote:
Originally Posted by VaporPressure
This is my data for sessions at 2 different tracks in a '18 ZLE with an updated (but still OEM) oil pump. 15W-50 oil. Oil temps are 265-275.
Oil pressure is plotted against RPM, excluding in and out laps. I'm mostly 35-55 psi with a trend toward higher pressures at higher RPMs. Plenty of pressures up into the 60s and 70s though. Not sure if the difference in SS vs ZL1 explains that or not.
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I kind of doubt it's the difference between engines, but maybe Chevy does calibrate the ZLE to move more oil. But there's a pretty big difference between the hot (100C) viscosity of the 15w-50 oil you're using vs the Supercar 0w-40 the OP is using, especially if his isn't a fresh fill. Your oil has a viscosity of 18 mm2/s, whereas his Supercar 0w-40 is 12.9 on its best (brand new) day, and will shear down to considerably less than that after a couple lapping sessions.* That probably accounts for most/all of the difference.
*The 0w-40 X4 has a 100C viscosity of 13.9, a significantly better high-temp-high-shear viscosity (3.8 vs 3.53), and resists viscosity breakdown over time a good bit better than the Supercar. It still has nearly as good cold-start (40C) viscosity as the Supercar, so it's still a great daily-driver/do-it-all oil, but it's just a much better option on track than Supercar. The 15w-50 is great on track, but not great for a daily because it flows much slower at ambient temps, and it has more calcium and other stuff that isn't good for DI engines over the long run. FWIW, I'm splitting the difference with my no-longer-daily-driven SS 1LE by using Supercar 5w-50. It's a very intriguing oil!