Turbo Blanket - University of Austin testing
 

I just wanted to share this link for fruit of thought.

https://repositories.lib.utexas.edu/...=1&isAllowed=y

TL;DR is, "oil coking" fear was shown to be negligible in lab testing; regular benefits of heat shielding and small gain in spool time during tip-in loads.

I am unsure if this controlled lab testing concluded what is the case in the real world; many people may have anecdotal data yet relative personal experience. Saying this, I think it is comfortable to conclude that turbo blankets don't have the astounding negatives of increased oil temps as I have seen preached before based on conjecture and the delta of oil temps may even be negligible to non-existent-- with then a statistical gain in tip-in spool time/torque.

shooter either used to himself or knew a guy who rebuilt turbos and said he saw tons of them with failed turbine seal from blankets. I dunno

I bet 99.99% of street cars never have this problem cause they don't see track.

I like heat shields myself

the article does mention modern turbochargers have heat shielding for the bearings internally. That implies to me, "modern" turbos of a certain quality would have them, I think Borg, Garrett, possibly othsrs. Probably not in your eBay turbos or maybe even older Garretts? I have no data on that, just an idea.

also noteworthy, the testing was done on a diesel and not a gasoline motor, which would change EGT things. Not apples to apples, but a good data point.

I thought it had something to do with metallurgy changes athigh temps that eventually put undue strain on the seals and whatever.

Heat sheilds with air gaps dont have this problem

Iirc

I recently picked up a 124 Spider and there are lots of threads on this on their forums. I actually just read the link provided in the OP today on that forum. It convinced me and PTP happens to make a direct-fit blanket for the 124.

I think the 124 won't have bad side effects because it has a pump that will pump coolant through the turbo, even after shut-down.That will get it down to whatever temp the ECU sees as acceptable, so oil coking should be nearly impossible.