I am going to be running a Holest HE351VE VGT (aka VNT) out of a 2007+ cummins diesel in my 6.5L chevy diesel truck. EGT will be limited to apeak of 1250'F. Normal operational temperature is under 900'F.
In an IDI diesel if you hit 720'C you will need a new engine.
That holset unit has water cooling and I will be using it.
I will also be running an intercool and water mist injection.
On a lot of V8 diesels you have a cross over pipe, it makes a big "U" turn that goes from one exhaust manifold to the other. I think that is where there will be a lot of heat loss.
I was considering exhaust wrap for 3 reason really.
1 to spool the turbo faster in the cold and hopefully make it over all more efficient.
2 keep the exhaust hot to keep soot and gunk from building up on the vanes in the turbine housing.
3 keep the added piping from cooking items under the hood.
Its mostly all right here:
http://ecomodder.com/forum/showthrea...uck-18187.html