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The pipes get hot from underhood temperatures. SAAB originally used the cast pipes (smaller and read 'turbo intercooler' on them). These old style pipes were on pre 89 900 turbos. They hold heat in longer, and do not get rid of heat as fast as the thin walled aluminum (what the 89+ pipes were made of). The pipes got hot and stayed hot, making the air pass through them just as hot. Now the aluminum pipes got cooler faster, so the air passing through did not get heated up on the way through them.
I currently have a 90 SPG with the aluminum pipes. Now with the Jet Hot, it will reduce heat even more.
The air in the pipes won't be as hot as exhaust gases for example. So the radiant heat won't matter. Especially since the inlet pipe is after the intercooler which chills the air up, and it is also before my water injection nozzle. The underhood temperature would make this pipe hot, now it won't. The turbo outlet pipe won't matter either since it is on it's way to the IC/h2o nozzle to chill it up.
I see what you're saying about allowing the pipes to radiate heat to reduce it. But the pipe will now (measurably) have a lower tempature, so it won't heat up the air passing through it.
Jet Hot records temperature drops on certain parts upwards to 300F degrees.
Interesting thought though, never looked at it that way. But from what I've been reading/hearing/seeing it's basically a good idea to coat almost everything (except the turbo housing, etc) to make things run cooler. Cooler air is more dense, dense air is more power ( :
If you want any more information check out the Jet Hot site (http://www.jet-hot.com)
Take care,
Happy SAABing,
Taylor
posted by 68.83.149...
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