Re: Turbo cool down-good idea!

Posted by Can't even use my name on March 22, 2006 at 09:39:49 from (216.241.134.233):

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

Well just because you have worked on turboed engines most of your life doesn't mean you really know how to run one, obviously. Just because you throttle up a turbo diesel doesn't mean you are using that turbo. They will only boost when there is a load on them. I have a boost and pyro gauge on both my '96 Chevy diesel and my Case 2390. If I go out and open them up I get no boost and little increase of EGT's. However, if I pull a 12K load or drop a 30' disk you will see those EGT's climb to 800 degrees and max boost (9 psi in both cases here)in a matter of seconds. With the truck and trailer once you hit cruising speed EGT's will drop to around 600 but with the tractor those EGT's will sometimes hit close to 1000 which means I'd better downshift or raise the disk a bit. Meanwhile boost is still at 6 or 7 psi. And this is regardless of being wide open or at 1200 rpm's. So obviously boost and EGT's are related. The more pressure you exert the more heat you make. When it comes time to shut off the tractor if you just pulled the disk outta the ground those EGT's will remain high for several minutes. The exhaust is still hot and remains that way for a few minutes, if you idle for just 3-5 mins you will see an 800 degree EGT drop to about 400 but it does take several minutes, not just a few seconds. So I guess if you want to shut off a turboed engine with a hot exhaust go ahead. And like I said before you will not make much heat or boost unless you are under a load. Running at high rpm's only adds a little extra heat.

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