Maybe they haven't sold many (if at all) for Supra B48's?
I do find it odd that the Supra has a totally different turbo inlet design and turbo compressor housing than the BMW's with the same B48.
Look the same as the day I bought them. However, I garage the car and don't daily drive it so it doesn't sit outside in the sun. Only when driving or at track events.
My personal supra with 600whp+, 28psi to redline, on track down the straight to 130mph+
This was also after five laps.
Coolant temp is directly related with oil temps, which is why I asked him to log coolant as well. I bet there is air in the system and/or coolant is low.
Do you have sensor tied to the DME or just the mix? Either way, shouldn't effect it with that little. Did you also turn the car fully off after the flash?
Then flash back to stock and see if that solves it. If it does, something in the tune is off. Is OTS or custom? If custom, you can try flashing to an OTS map before stock if you wish.
Any fuel mods? HPFP or injector upgrade?