|
Well the thinner (generally) material of the tubular top mount manifold would shed heat faster.
That coupled with the fact that whatever turbo you are running is going to have a larger, less restrictive turbine wheel and housing.
Which means less heat generated.
I have definitely noticed this on my car, previously with the car waiting at traffic lights in the rain, steam from the water could be readily seen coming off the hood.
Now with my hybrid complete with upsized turbine wheel this no longer happens.
The trade off is how much closer to the hood and spark plug wires does the new manifold come.
And also the slightly smaller diamter pipe required to retain some low end spool would also cause a heat increase.
But as mentioned that can be countered with heat wrapping, turbo beanies & or ceramic coating.
As I said earlier to me it still does not make sense to build a new manifold unless the chosen turbo simply cannot be made to fit where the stocker once did.
|
