Ran another road test tonight with the car, but this time brought the laptop along to datalog. Using my Zeitronix logger, then exporting the data to CSV and graphing in Excel, I came up with the following graph. Note that my wastegate springs are 9psi springs and the boost controller is set to zero, so I should be hitting about 9psi, but I'm really hitting about 12psi. Based on the way the boost surges to 9psi, then creeps to 12psi, I imagine that I either hooked up one of my gates incorrectly or I have a problem with the boost controller. When I was running springs alone I had no boost creep issues so it has to be something new with the controller or the way I installed it.

Also, I can't stress enough how much I am digging my Ron Davis radiator w/ EOC and the custom fan shroud I made for it. I did 6 back to back runs tonight and it was only on the last run where my coolant/oil temps went over 190. It's 85 degrees ambient here right now. I cruised in the car for a minute and they pretty quickly went back down from 198 to 190.

This part of the graph shows just 2nd and 3rd gear, I believe.

 

mechanically your boost is set at 9 but hitting 12?
somethings not correct, your lines connected to the bottom of the wastegates? you may have a HOLE in your line, i'd check it.
this happened to pauls z06 and he majorly overboosted.

 

Yup, I think I just reversed the top/bottom lines on one of the wastegates. Whatever it is, it should be a simple fix.

Oh, and one other thing to note about the coolant/oil temps. These temps are with 100% coolant (zero water). I am prepping my coolant system for Evans coolant and they recommend flushing/filling it with 100% Sierra coolant first, because it's compatible with the Evans stuff. Anything over 3% water in the system results in decreased efficiency of the Evans coolant. So realistically the temps should drop a bit too once I switch over to the Evans stuff, since it should carry temperature away better than pure traditional coolant.