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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 02-02-2009, 12:59 AM   #61
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Originally Posted by fahrvergnugen View Post
Com'on, you've got better fallacies to offer than a circular argument, don't you?

If it helps you spool faster, then it will keep you at speed more effectively, right?

If it lowers your under-hood temps more effectively than a heat shield, and extends manifold life, then why not do it to a car that often suffers from an overheat condition in stock form vs. one with a turbo? (Keep in mind, I would suggest doing the manifold, the and the downpipe as well)

Sorry to the OP, I didn't mean to take us so far OT.
Im sorry, but unless you can show some numbers, Im going to say you are completely wrong (like nearly everyone else has said). No way a paper thin layer of ceramic is going to keep temps lower than a heat shield. Ceramic coating is like I said, paper thin, and in direct contact with the metal. A heat shield is a thicker sheet of metal, with an air gap around it. That air between the turbine or downpipe and the shield will do a MUCH better job at stopping that heat transfer to surrounding parts than the ceramic. Same reason and basics of why good home windows are double paned, and why your walls have an air gap filled with fiberglass. Surface to surface is almost always going to be less efficient than having a nice large air gap around the 2 parts. Plus you figure in that the air between the hot parts and the shield will likely have a pretty good air flow to hopefully remove the hot air to under the car, if built well. The heat has to go somewhere.

Thats not saying ceramic doesnt help, and I wouldnt have my stuff coated, but its not much help by itself, besides looking good and keeping rust down.

But back on topic, those shields look great. I wish I could start fabbing one up for myself, but I dont even have the turbo, manifold or downpipe yet...
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Old 02-02-2009, 08:58 AM   #62
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Nice job Stein- and I think the open front and bottom will allow good air flow around the turbo to help ventilate the under hood heat. It's similar to (but nicer than) mine, which has worked well.
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