Turbo cool down period - How long??
#32
Professor of Pending Projects
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Originally Posted by jcb-memphis
I have moved to 60s for simple driving and 120s for anything with boost in the last 5 minutes, even 0.1bar. Just what I am doing. If I tracked, I probably would go 4-5minutes/a lap too, but I don't.
If the turbos did not fail, people like Kevin would have a lot less business. They fail. I have seen Audi's go up, Saabs, one 930's.....so in time with abuse, these will too. It is probably a bell curve...some peoples' will fail with good care and others will never fail with abuse. I suspect Porsche knows....
Just my opinion. I just listen to music.
JB
If the turbos did not fail, people like Kevin would have a lot less business. They fail. I have seen Audi's go up, Saabs, one 930's.....so in time with abuse, these will too. It is probably a bell curve...some peoples' will fail with good care and others will never fail with abuse. I suspect Porsche knows....
Just my opinion. I just listen to music.
JB
#33
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Originally Posted by Dock
Our turbos run ~150,000 rpm at full boost, and the maximum designed rpm is 170,000.
Hey Dock, I can believe those numbers. With the Aircraft Turbo's, they where limited to about 60,000 by design as part of the Type Certificate. The Turbo's on aircraft are larger in diameter and output. More than the engine can handle because they are also pressurize the cabin. The FAA also worried about the turbine section coming apart at high RPM and the housing was thicker to prevent penetration should the turbine wheel go Omni-directional.
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