Just come across this one........it's always a downgrade of course.
But anyway it's a good demonstration of how heat shielding is essential.
Most kids wouldn't even figure out that when you're at full noise your exhaust manifolds glow red.Everything up to and including the turbo. The turbine drops both temp and pressure.
Heat shielding, there's at least 3 ways to do it.
The factory way is always best and that is always sheet metal. Sheet metal blocks radiated heat, lets hot air out and doesn't cause the hot bits to be excessively hot and then fail.
Then there's heat wrap, horrible stuff, It keeps the heat in.
Then there's ceramic coatings too. just as bad if not worse.
The real answer to doing a single turbo conversion and not burning up.........can you firstly make then secondly fit sheet metal heat shields? Not really enough room?
But not only that, you're probably going to make your own manifolds, I've been there done that before I had a GTO. Made several. They get hot and expand when you use the wrong materials. Then they cool and shrink. The flange that bolts to the engine, that stays at about a constant temp compared to the pipes. With expansion and contraction with all the heat cycles, it changes the angles between the pipes but also puts lots of stresses in different places depending on actual pipe lengths.When they get hot and expand they also get soft, so once everything is at max temp it'll de stress 'cos it's soft but then when it cools and shrinks, the pipes pull back together, often the pipes look like they've been trying to pull out of the flanges, the flanges then warp and leak then there's a lack of boost.
Then you've got to pull it all apart, if you had heat wrap on it, well it's that much hotter in there , it fails that much sooner, take the wrap off, fix it, put it back together........repeat, repeat, repeat.
Ceramic coating is always worse 'cos it won't weld, how do you grind in those tight spots?
That's why I won't use anything other than factory cast manifolds with adaptors, but there's still the V engine problem where you need to allow for expansion between the banks.
I've still got all my factory heat shields in place. If you remove the front one ......the alternator WILL fail.
Like kids with evos, they get custom manifolds, no heat shielding and can't figure out why the cam sensor just failed?
The worst I've had on my Z was with exhaust gaskets continually blowing out, again it's cos the flanges warp, where it's loose, it blows out. The square flange at the turbo inlet, it started leaking but leaked upwards right on to the bonnet , blistered the fresh paint.
Prior planning prevents piss poor performance.