It all makes sense, but the another question is WHAT PRESSURES wipe out the thrust bearings, what duration ect.
I can tell you we have run this setup for YEARS and there is no issue with the thrust bearing, so while it might make theoretical sense to take things a step further, I don't see a reason to in my application since there is nothing causing bearing failure. I am running the reactor AL flexplate.
Just a note: In my graph, the 0 mark is where I zero'd the log when the driveshaft actually moves. The rest is the run. The TPS trace is at the top.
I really hope this graph helped guys out. My reasons for doing this was to see what actually does happen during the pass. I would love to see other information for comparison reasons, but it's going to take a good logging system (not 10 frames/second) to really see in definition of what is going on.
Looking at these pressure traces raises some questions in my mind.
First, if you were to map out the PR valve motion during a gear shift, this is what I would expect.
1 – Since there is a need to fill an empty void, the PR valve would slam shut to compensate for the sudden pressure decay. This would effectively shut down the converter charge circuit if it was a stock unmachined valve.
2 – The pressure would rise in the circuit as the spring force increases on the intermediate piston while stroking. This would happen very fast.
3 – Once the Intermediate piston completed the stroke, the PR valve would stabilize in a certain position. May or may not be in its original position before the gear shift.
4 – On the Third gear shift, The pressure would rise in the circuit as the spring force increases on the direct piston while stroking. This would happen very fast but with a different signature as intermediate
a – Itermediate springs are much lighter.
b – Intermediate fluid volume is most likely different
c – Direct springs are stiffer
d – most direct pistons use a bleed hole and tax the regulator.
5 – Once the direct piston completed the stroke, the PR valve would stabilize in a certain position. Most likely won’t be in its original position before the gear shift. See below.
The pressure in the PR circuit near the valve will probably be much different then the pressure near the drums simply due to pressure loss from leaks, losses from turns and flow restriction and fluid orfice restrictions.
The pressure spikes would almost indicate that the PR valve is modified to allow full flow at any position. Restricted orfice downstream can’t compensate for varying flow rates.
Allan G.