Originally Posted by nissanfanatic

^Yes exactly. My second paragraph was just to further emphasize that the "toilet bowl" effect is impossible unless the engine is the center of gravity of the car IE the car does not rotate around the engine.

Originally Posted by Greg W

Finally got to spend a little more time looking (and learning) at the graphs. I stand corrected...oil pressure dropping below 50psi correlates quite well with revs falling well below 5000rpms. This holds true in the spins as well as a few other times where revs dropped (but pressure was never below ~40psi). Pressure drop doesn't seem to correlate with Gs (neither lateral nor acceleration). What I originally took as G-induced "swirling" (with oil pushed to the side of the pan, then to the rear of the pan as I slid backwards under braking) is trumped by the pressure/rpm data.

Here's a oil pressure/RPM graph of the same T1 spin overlayed on the previous lap. Graph shows both T1 and T2 (a 70 mph 180 degree turn) to show the effects of a sustained left.

Blue = spin oil pressure
Red = normal oil pressure
Light Blue = spin revs
Pink = normal revs



Lots of good info with this data acquisition, I just need to learn how to use and interpret it.

Originally Posted by nissanfanatic

^Yes exactly. My second paragraph was just to further emphasize that the "toilet bowl" effect is impossible unless the engine is the center of gravity of the car IE the car does not rotate around the engine.