Quote:
Originally Posted by sw20kosh
So even with the Robispec cooling system temps are not kept in check out there in the dessert heat?
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Location and the sheer amount of heat produced by a turbo is probably the biggest problem. EGTs out of a turbo are incredibly hot, which means the turbine housing itself is at least as hot, especially with insulative materials, and then it's exposed to that downpipe, so you have additional radiative surface area. It's like putting a space heater inside the engine bay.
Thing is, you have to keep exhaust gas velocity up to keep power. The problem is keeping that heat contained to the exhaust path without overly cooling that air. Thus the heat problem.
Unless you better isolate the hot parts by physical isolation (such as with a rear mounted turbo, or to a lesser extent a behind-engine-mounted turbo), where you can immediately shunt the exhaust gasses away from the engine bay, instead of a good bit of the hottest part of their path still be between the radiator and the engine block, the heat issue is going to continue to be a problem.
That is, unless, you can come up with a more efficient (heat and velocity converted into kinetic energy to drive the turbine wheel) turbine housing... aka, a bigger turbo running lower boost pressures (but moving more air).
However, it sounds like the constraints the customer put on CSG negate the best solutions.
So, the best they can do is the best they can do... unless you can somehow put in a kind of coolant chiller into the system that can act as a heat sink for the excess heat...
even then, you still need to keep oil and coolant to at least a certain degree of heat for them to cycle well in an operating engine block...