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Turbo cool down

2K views 10 replies 10 participants last post by  mschn99 
#1 ·
I have my cool down temp set at 400 degrees. So when park and turn off the key the truck will remain running and shut down once 400 degrees it met. Is 400 a good cool down temp for shut down or should it be lower?
 
#2 ·
How long does it take to cool down on average? I usually let mine idle for a minute or two if it's been working. If I more or less coasted into where it gets parked, I don't give it very long.
 
#3 ·
It depends a lot on how you were driving it when you parked. Pulling a trailer, racing, hauling large loads. I think that its better to go on a time basis rather than EGT, because as soon as you start idling, the ECM has pulled a lot of fuel from the cylinders, and that will lowers your EGT's really quick. If I have "worked" my truck hard then I let it idle, anywhere from 3-5 minutes, and maybe as much as 10 if its a big load (I haven't pulled anything that heavy yet).
 
#4 ·
Reguardless of what I have been doing, towing, racing WOT or normal driving, my EGT tamps get down to 350 within 1 minute every time idleing.
10 minute idle is only using fuel.
 
#5 ·
Yes, your EGT is at 350, but the turbo housing isn't going to cool down as quick.
 
#6 ·
I have talked with ford techies and they told me 3-5 minutes anymore then that and you are wasting fuel and taking a chance of plugging the egr valve.
 
#7 ·
u can get turbo timers that tap into your boost line and that will figure out how long it lets it idel. it can sence when u r doin a lot of work and when u r just put-sing. that is what i recommend
 
#8 ·
I think people worry about it TOO much.

My EGTs drop to 300 degree's VERY quickly. THink of ALLLLL Those powerstrokes w/ ORIGINAL MOTORS and TURBO'S that have gone 250k+ and NEVER had an egt gauge installed or let to idle the perfect time after driving it.

For me, as long as it's around 300 I shut her off... hope this helps :D have a nice day! :thumb:
 
#9 ·
This is a new one me...I was unaware that you were supposed to let the turbo cool down? :confused: I've only got about 24K so far (bought it new), and I don't have any tuners, and I rarely tow anything. I mean, my foot is heavy, but that is the worst of it. Is this really big deal? I've always let everything I've owned warm up, but this is my first diesel, and I am still learning. I don't know that I have the patience to sit around AFTER I get where I'm goin.
 
#10 ·
Was told by my diesel tech that the only time you 'should' let it idle a few minutes (max 5) is when you have had your boost above 15 to 20PSI consistantly for an extended period such as pulling a hill with a fairly heavy trailer. He also said that in most most circumstances, just slowing down to pull into a rest area, turn into your driveway, pull into a parking lot, etc., will provide an adequate cool down of the turbo.
 
#11 ·
Bottom line....this was a major problem with the origional turbocharged diesel trucks from the origional turbo charged onebasically up untill the late 80's. Since then, the oiling systems...along with everything else has been so finely tuned and made so efficient that unless you just hot rodded it for a considerable amount of time....or just got to the top of a mountain pass towing heavy.....all your doing is wasting fuel. There is no need to let a turbo cool down on a modern diesel unless the truck literally....and i mean within minutes of stopping....had been run VERY hard for a decent extended amount of time (at least 10-20 mins) This is something that was true in the day but has become more of a wives tale for a modern truck
 
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