On modified turbocharged cars, you often see the turbo wrapped with a curious piece of flexible metal-like material. This sleeve is called a turbo blanket, and it could save your engine bay from a lot of damage.
Now, most turbocharged cars can get by without a blanket because they aren't using the turbo enough to generate a significant amount of heat. But when people start to push 30 lbs of boost through their racing car's engine, high temps becomes a real issue.
Rob Dahm, a popular automotive YouTuber, had this problem. He built a turbocharged three-rotor RX-7, & from the video you'll see below, his engine makes a lot of heat. So much so, in fact, that without any protection, the turbocharger will melt the paint on the hood above it.
I know, crazy right!
Dahm wanted to see just how well a turbo blanket really worked, so he took temperatures of the turbo, the intake, and the engine bay with an infrared camera—both with and without the blanket installed.
The results are pretty crazy. The camera shows just how much of a difference the turbo blanket makes to contain heat. With it installed, only moderate amounts of warmth are visible in the intake. Without it, the whole turbo glows a bright yellow and reads as much as 760 degrees Fahrenheit.
Here's without the turbo blanket below firstly:
Now from the results as you can see, it's glowing a bright orange/red colour. Many nearby components would be severely damaged if exposed to that much heat for any amount of time. Now lets take a look at the same turbo with the blanket on.
Dahm goes into detail about the test and his results, so if you're considering a turbo blanket or just want some good trivia to impress your friends, give this video a watch below.