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If you have a turbocharged engine, insulating the pipes from the engine to the turbocharger is beneficial, to keep the temperature and pressure up so it's available to spin the turbo.
Can you explain that? The reason for wastegates is to control the ability for turbochargers to produce more pressure than wanted with or without insulating pipes, why would I want anymore I can`t use?
True, I've heard of that for sure. I think some may use solid ceramic plumbing, but I'm not up on the new race stuff. But they all use methods to retain the heat of the exhaust gas to the turbo.
A system designed for efficiency would not waste any exhaust gas, but most systems have turbochargers bigger than needed for maximum efficiency, so that you have more boost at less than peak conditions than you would have had. That is, decent boost at less than the peak power RPM. As you said, the waste gate relieves gas when there's more than you want. But before the gate opens, keeping the gas hot will let you get more energy out of it to drive the turbine than if you let it cool (improved lower RPM boost). I'm not around real race engines very often, but I'd bet that they have insulation between the exhaust ports and the turbocharger(s).
In land speed racing the wrapping of pipes seems to be a tuner's choice and from what I see at the tracks it's maybe 30 percent of the bikes...and sometimes it's done to keep heat from away from certain components rather than for tuning...Like Jim says, it can be beneficial if done correctly...