Re: Turbo cool down

Posted by Can't even use my name on March 24, 2006 at 14:11:11 from (216.241.135.183):

In Reply to: Re: Turbo cool down posted by NC Wayne on March 22, 2006 at 22:45:41:

I am the one who said you get no boost by just high revving an engine, should have said you get little boost by doing so. The faster you rev the engine the more air she pulls in so your faster spinning turbo is basically supplying enough air to prevent a vacuum in the mainfold such as the case in a non-turbo engine. Now if you have a hugh turbo then you may see a couple pounds of boost I guess. And you will see boost if you crack it open but only untill it hits max rpm's. To build several pounds of boost you need some sorta load on the engine where the fuel is burning hotter causing it to escape the cylinder at a higher rate and spin the turbo faster than normal for the given rpms of the engine. So now your turbo is supplying additional air to create pressure in the manifold, hence boost. Now you are correct about normal no load driving a pickup and really not needing to cool it down. Like I said, I have gauges on mine and just plain cruising will net about 350-400 degree EGT's. This is an acceptable temp to shut down. On this type of driving your exhaust components don't get that hot and will cool quickly but on anything that has been pulling and boosting for a long period of time where the EGT's have been at 800 degrees those components are that hot too and it takes a bit longer to get them to cool to the 400 degree range. I don't think anyone mentioned that the idea is too cool the components somewhat slowly, too quickly and parts that can cool quickly will do so and shrink and crack. But what do I know?

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