Re: Turbo cool down

Posted by RodInNS on March 22, 2006 at 14:32:09 from (142.177.72.71):

In Reply to: Turbo cool down posted by NC Wayne on March 21, 2006 at 21:31:01:

You might want to spend a little more time with that pyro. I run one on my Ford 7710. The tractor has it's rack travel increased 17%, so needless to say it's getting a lot of fuel. I often see temperatures rise to, and level out around 1150 in the pipe, after the turbo, which should lead to a temp of about 1350 in the manifold. This is at maximum delivery. It's hot enough to smell the turbo inlet housing. However, if you watch the EGT with the engine running at high idle (no load) the temp will go to near nothing quite quickly. If you idle the engine at low idle, the EGT will drop more slowly. Rev it to about 1000 rpm, it drops moderately quickly. Ford always recomended idleing at 1000 rpm for 1 minute. That is sufficient to bring the EGT from ~900 to ~250 degrees. So yes, idleing for a minute or 2 is also about cooling, not just allowing the turbo to spool down. The turbo itself should spool down in a few seconds. Even the big Holsets on the N14 will spool down in 10 seconds, without a lot of idle time. I lost one turbo to misuse... both lack of cooling and spooldown time, and starting and going to full load. I've got no plans of losing more. They get their warm-up and cooldown time.

Rod

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