Heat Protection
Determining Turbo Blanket Size
Your turbo blanketselection should be based on the outer diameter (OD) of the casing on your turbocharger's "hot side" (which houses the exhaust-fed impeller). Therefore, you should either look up or manually measure the diameter of your turbocharger's hot side, as described in the figure below, and purchase the appropriately-sized turbo blanket. PTP Universal Turbo Blankets are tailored to fit turbochargers with external wastegates without any modification. If your turbocharger has an internal wastegate, however, you may need to make a simple modification to allow it to fit appropriately (e.g., cut away a portion of the turbo blanket).
Headers: Wrapped vs. Unwrapped
Exhaust manifolds on turbocharged cars channel potential energy to the turbocharger. Any energy that is lost to either the manifold or ambient air will not reach the turbo. This energy, therefore, cannot be used to spin the turbine wheel and turbo performance will be reduced. This means it will take the turbo longer to reach target boost.
Header Exhaust Wrapping
We have wrapped many headers and other exhaust components in the shop and wanted to share with you what we feel are some of the best practices and techniques we have gained through experience.