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Originally Posted by sperry
Hot gasses do not "move faster", there is a difference between pressure and flow. Gasses that come off the motor are expanding due to their heat. If you let the gas cool, it doesn't expand as fast... i.e. you're losing some of the kenetic and thermal energy that will spin the turbo. Once the gas leaves the turbo, you don't want it to expand, because (just like a balloon) they expand in all directions. Expanded gasses after the turbo push backwards against the turbine blade, and slow them down. Ideally, you'd want hot expanding gas before the turbo and cool contracting gas after the turbo to help scavenge the gasses out of the turbo and reduce back-pressure.
Hi temp paint on the IC pipes will have virtually no effect. Get some thermal wrap from summit, it's relatively cheap, works well, and looks like ass under the hood (helps reduce the chances people will call you a ricer  ). This is the stuff: http://store.summitracing.com/defaul...=egnsearch.asp |
A really cool theoretical discussion on the topic of holding heat in post turbo can be found starting on page 2 of a thread sombody started on heat wrap. Here's a link:
http://www.wrxfanatics.com/index.php...ot%20gas&st=15
You know it's a good discussion when people start quoting Corky Bell.
One thing Adrian (Thunderbolt) brings up is convection currents that can slow velocity if heat difuses too quickly through the pipe.