Accusump - some data

[truegearhead]

Originally Posted by JEDD

This is an interesting discussion. I took my Accusump out a couple years ago. If anyone is interested in a setup, I'll let it go cheap. Just pm me.

Just sent you a PM.

[AZ986S]

Gang,

I was at NASA Bondurant last weekend and I logged the oil pressure data while using the Accusump pressure switch bypass, effectively running the valve open all the time when bypass is ON.

It is a very short 1 mile track with almost constant turns, and pretty slow overall. Last time I was there, the Accusump was triggering often.

Here's an updated summary:



For session 1, I did not engage the bypass switch, just leaving it in standard pressure switch mode. It only triggered once. For sessions 2 and 3, I turned ON the bypass switch, keeping the valve open. Although the temps were warmer than session 1, I did not see any significant difference on the Valve Cover oil pressure minimums, with a 4 psi difference (31-27) between sessions 1 and 3 with bypass ON being better. This comes at the expense of a somewhat higher oil volume depletion in the Accusump, indicated by lower minimums/maximums air side pressures when the bypass is ON. This means there is more oil in the sump/in circulation in the engine. This setup is working well for me so far, but I can't yet conclude that the bypass switch ON has a significant effect on reducing oil pressure dips (starvation). Will need more data.

What I will do for the next event is reduce the total oil volume so that, at 80 psi air side pressure, the dash level indicator shows full and not 1 bar above as I had setup for the previous events. My suspicion is that the extra volume is contributing for the Accusump not triggering as often, as well as possibly the air temps being cooler. I also believe that the higher air side preload (15 psi vs 7 psi originally) is helping.

[AZ986S]

Another update with the most recent data from AMP with PCA this last Saturday.
It was a spectacular day to be at the track, great weather, air temp 65-70F, only a few cars in DE4, so a lot of open track!

Here's a link to the first 15 minutes of session 3, with data overlay showing the oil and accusump pressures. I had the by-pass switch turned ON for this session. This basically bypassed the pressure switch and kept the solenoid valve open.

https://youtu.be/-pKNVFNYCgE

Here's the updated data summary that includes the 4 sessions last Saturday:
Something went wrong for session 2 as indicated by negative pressures.



The oil pressure during session 3 was rock solid. I am sold on the Accusump by-pass mod. I think this is a configuration that can be used for pre-oiling as well as open valve for track usage. I also believe the 15 psi Accusump air side preload is more effective than the recommended 7-10 psi. One other thing I'm doing is keeping the oil level slightly above the max line on both the dip stick and the electronic gauge. No issues with AOS.