First, remember "hot" water temp is not hot oil temp. It can take a lot of running to get the oil temp hot.

My 511 CID race engine is setup to run 75 psi going down the track with oil temp 130-150 F. At 1200 rpm idle it is around 40-50 psi depending on oil temp.

My 440 CID street car has 60 psi driving down the road with hot oil (150-200) and 25 psi at 800 rpm idle. This one has higher cold oil pressures around 85 psi at 2000 rpm until the oil gets warmer.

I also did a test with a standard volume pump and high volume pump. This was not back to back the same day, but I was convinced of the results with all the data I have on my race car. No significant ET difference. I even used the same bypass spring in both pumps so the down track pressure was the same. Of course the idle pressure was different. Maybe a stock class racer might find 0.01 seconds in a lower hp engine.