Well not sure right or wrong but I endorse DEI's stuff extensively. I have their woven reflective fabric over several of my intercooler hoses to avoid the heat sink effect that big black rubber hoses have in hot engine bay. I also have their convoluted plastic reflective tubes over several specific things that are close to the exhaust manifold, turbo and turbo downpipe on my rig. I also use their stainless steel ties and posted something about that here many moons ago - they are so super cool - they can tolerate intense heat and are removable and reusable.
Basically I'm using these things to keep heat away from sensitive stuff, I am not using it to keep heat IN the exhaust. However, I would use this on the exhaust but NOT on the turbo unit itself (they make a special setup to cover the turbo). I do not use it cause my exhaust is ceramic coated and that already helps hold the heat in the exhaust but if I did not have the coating, I'd have the wrapping.
AFAIK, it is a relatively undisputed fact that keeping the exhaust hot helps performance.
I pulled this explanation from another site:
"Think of exhaust gases as a piston moving down through the tubular system. As each pulse travels down the system, it creates a vacuum behind itself. The negative pressure behind each is the scavenging effect. As the velocity of the pulse increase, the negative pressures also increase. As you have an increase in velocity, the length of time that you have a negative pressure in the system is increased. The net result of high velocity to assist in scavenging is increased performance of the intake and exhaust system.
Maintaining higher exhaust temperatures throughout the system increases performance in many ways. Think of exhaust gases as a heavy liquid such as an oil additive. If the liquid were traveling down a tubular system in a cold state, it would move very slowly. If you heat the liquid, the density of the fluid changes. The liquid responds to the heat increasing its velocity. Exhaust gases respond in the same manner. Higher temperatures in a system increase the flow of the system. If the liquid is allowed to cool in the system, it slows the flow of the liquid. By this illustration, you can now see the importance of maintaining higher temperatures in an
exhaust system.
Wrapping the headers maintains exhaust gas heat within the header. This translates into more exhaust flow due to maintaining exhaust temperatures as it flows out of the engine. By improving the scavenging of spent gases, the engine breathes more efficiently. This reduces resistance of gas flow, thus allowing the engine to develop more power"
BTW, the best place I have found for purchasing all these products is Eastwood. You can find them at www.eastwoodco.com . HTH.
Ohh yea, BTW, why would I not use it on the turbo itself, well, that is hot enough already and although I might get even faster spool and spin by keeping the turbo hot, its not worth the reliability problem; this stuff is safe on steel tubing but not on castings in my opinion. I have two friends who run the Pikes Peak Hillclimb every year and they both had breakdowns due to cracking castings after using the turbo covers. They were pissed as you can imagine. They do use the stuff extensively everywhere else to both keep heat away from things and inside of things. HTH
Basically I'm using these things to keep heat away from sensitive stuff, I am not using it to keep heat IN the exhaust. However, I would use this on the exhaust but NOT on the turbo unit itself (they make a special setup to cover the turbo). I do not use it cause my exhaust is ceramic coated and that already helps hold the heat in the exhaust but if I did not have the coating, I'd have the wrapping.
AFAIK, it is a relatively undisputed fact that keeping the exhaust hot helps performance.
I pulled this explanation from another site:
"Think of exhaust gases as a piston moving down through the tubular system. As each pulse travels down the system, it creates a vacuum behind itself. The negative pressure behind each is the scavenging effect. As the velocity of the pulse increase, the negative pressures also increase. As you have an increase in velocity, the length of time that you have a negative pressure in the system is increased. The net result of high velocity to assist in scavenging is increased performance of the intake and exhaust system.
Maintaining higher exhaust temperatures throughout the system increases performance in many ways. Think of exhaust gases as a heavy liquid such as an oil additive. If the liquid were traveling down a tubular system in a cold state, it would move very slowly. If you heat the liquid, the density of the fluid changes. The liquid responds to the heat increasing its velocity. Exhaust gases respond in the same manner. Higher temperatures in a system increase the flow of the system. If the liquid is allowed to cool in the system, it slows the flow of the liquid. By this illustration, you can now see the importance of maintaining higher temperatures in an
exhaust system.
Wrapping the headers maintains exhaust gas heat within the header. This translates into more exhaust flow due to maintaining exhaust temperatures as it flows out of the engine. By improving the scavenging of spent gases, the engine breathes more efficiently. This reduces resistance of gas flow, thus allowing the engine to develop more power"
BTW, the best place I have found for purchasing all these products is Eastwood. You can find them at www.eastwoodco.com . HTH.
Ohh yea, BTW, why would I not use it on the turbo itself, well, that is hot enough already and although I might get even faster spool and spin by keeping the turbo hot, its not worth the reliability problem; this stuff is safe on steel tubing but not on castings in my opinion. I have two friends who run the Pikes Peak Hillclimb every year and they both had breakdowns due to cracking castings after using the turbo covers. They were pissed as you can imagine. They do use the stuff extensively everywhere else to both keep heat away from things and inside of things. HTH
