Titanium Turbo Blankets & Exhaust Wrap?

[911TT33]

Hey guys,

What are your thoughts on using turbo blankets to keep heat away from engine components?

With my TT setup, the turbos are very close to the bottom plug leads, so I’m thinking of using these titanium blankets to keep heat inside the turbo hot housing rather than dissipate to nearby engine components.

Note: The car is pure street, not track focused.

Thoughts?



Also looking at wrapping the exhaust between the turbo and muffler with this exhaust wrap. Would also protect the oil drain lines, especially from the hot housings which glow red!

[Speedy Squirrel]

Generally, we instrumented the bearing housing at the turbo drain side. If it went over 135 C you were in trouble. That meant having to use a water cooled bearing housing. Not really an easy option for us. I think you would be over 135 with a turbo housing blanket. They make fiberfrack sleeves for spark plug wires. Have you considered that?

[911TT33]

Originally Posted by Speedy Squirrel

Generally, we instrumented the bearing housing at the turbo drain side. If it went over 135 C you were in trouble. That meant having to use a water cooled bearing housing. Not really an easy option for us. I think you would be over 135 with a turbo housing blanket. They make fiberfrack sleeves for spark plug wires. Have you considered that?

Thanks for the tip. I found these, which look great for plugs and oil lines etc…

[66cal912]

Would not recommend wrapping any exhaust piping between the turbo and muffler with header wrap, it locks the heat in, over heats the exhaust head pipe material and will severely shorten the life of your exhaust. Better off to build a heatshield that clamps on with hose clamps that is directed to the area of concern for the heat, if this is the rear valance or back toward the engine. The air gap between the heatshield and head pipe will reduce the radiant heat, and allow enough air around the headpipe to cool it. Refer to how the heatshields work on modern motorcycle exhaust, such as any of the current Harley Davidson Bagger platform. Just my 2 cents after designing and manufacturing various Japanese and Harley Davidson exhaust the last 20 years.

I do think the wrap on the wires like you show, is excellent, have used similar products on my 930 to protect harnesses, in the hot areas of the engine compartment. DEI makes some good material. There is also some other good manufactures.

The turbo bags, seem to be effective from what I have heard, haven't had one to know the long term affects, I m sure some other members here have used them and can chime in, or Chris from Turbokraft. I would think trapping the heat in, would play on the life of the turbo itself as well.

Good luck in your build!

Ben

[911TT33]

Originally Posted by 66cal912

Would not recommend wrapping any exhaust piping between the turbo and muffler with header wrap, it locks the heat in, over heats the exhaust head pipe material and will severely shorten the life of your exhaust. Better off to build a heatshield that clamps on with hose clamps that is directed to the area of concern for the heat, if this is the rear valance or back toward the engine. The air gap between the heatshield and head pipe will reduce the radiant heat, and allow enough air around the headpipe to cool it. Refer to how the heatshields work on modern motorcycle exhaust, such as any of the current Harley Davidson Bagger platform. Just my 2 cents after designing and manufacturing various Japanese and Harley Davidson exhaust the last 20 years.

I do think the wrap on the wires like you show, is excellent, have used similar products on my 930 to protect harnesses, in the hot areas of the engine compartment. DEI makes some good material. There is also some other good manufactures.

The turbo bags, seem to be effective from what I have heard, haven't had one to know the long term affects, I m sure some other members here have used them and can chime in, or Chris from Turbokraft. I would think trapping the heat in, would play on the life of the turbo itself as well.

Good luck in your build!

Ben

Thanks for your feedback, Ben. Appreciate it! 👍🏼

[911TT33]

Guys, is this dangerously too close to the lower valve cover, considering how hot the turbine housing gets?!

I’m wondering whether the turbo blanket will actually fit within this gap? Haven’t received it yet to test clearances.

Thoughts on how I can reduce heat on the lower valve cover to minimise warping/damage?

[flightlead404]

Have you cut away material from the valve cover to provide clearance?

Can you even get that cover off for maintenance?

For me, that's simply way too close, not just for heat transfer and maintenance issues, but from that pic at least there might even be interference when the engine is running/shifting.

[bleucamaro]

My thoughts. Don't.

Blankets and wraps trap moisture through condensation (when the engine cools) and promotes corrosion, yes even in stainless.

A better solution is to have the headers ceramic coated which keeps the heat in the header, reduces convection/radiation to surrounding components, is easy to clean, and (opinion) looks better than raw or wrapped.

Additionally, sheet metal heat shields from the turbo hot-side will help as well.

[911TT33]

Originally Posted by flightlead404

Have you cut away material from the valve cover to provide clearance?

Can you even get that cover off for maintenance?

The plan was to use a die grinder to cut away a bit of material from that valve cover lip so I can fit a heat shield or turbo blanket around the turbo hot side housing.

For valve adjustment, there will need to be some disassembly required. lol

[911TT33]

Originally Posted by bleucamaro

My thoughts. Don't.

Blankets and wraps trap moisture through condensation (when the engine cools) and promotes corrosion, yes even in stainless.

A better solution is to have the headers ceramic coated which keeps the heat in the header, reduces convection/radiation to surrounding components, is easy to clean, and (opinion) looks better than raw or wrapped.

Additionally, sheet metal heat shields from the turbo hot-side will help as well.

Thanks. Yep a heat shield protecting the section of the valve cover where the turbo hot side is would be perfect.

Something like this which is only 0.5mm thick:

https://funkmotorsport.com/product/thick-aluminium-barrier-heat-shield-0-5mm-thick-sheeting/

[911TT33]

Originally Posted by bleucamaro

A better solution is to have the headers ceramic coated which keeps the heat in the header, reduces convection/radiation to surrounding components, is easy to clean, and (opinion) looks better than raw or wrapped.

Additionally, sheet metal heat shields from the turbo hot-side will help as well.

OK, I’ve been quoted $600 to ceramic coat both heat exchangers and the two turbo hot housings, so I think I’ll go down that route and also fabricate heat shields between hot housings and valve covers 👍🏼