Cool down time for turbo

[NDearyan]

I have a stock all the way 1993, 1 ton 4-wd. extend cab.



How long should I idle, before shutting down?



I have barely been doing that, and it has got me to thinking.



Does anybody make a double pyro?



One with 2 needles, and one reads before turbo, and one after. This way you could read the EGT's, and know when to shut down.



Someone else mentioned the concept of some of the differences between before turbo temps, and after.



Anyway, thanks all.



Nate

 

[Greenleaf]

The majority will say 300° is shut-down time. It takes quite some time for my engine to cool to 300, so it's generally a bit higher. I have tried to be careful with this new turbo... . but I have a very impatient wife and it looks stupid to set alone out in the truck cab several minutes after arriving at the in-laws, family picnic etc. etc.



I'm trying to do better.



Scott

 

[RankRam]

Scott, get ya one of these.



http://cool-downtimer.com

 

[y-knot]

I use the Cool-Down timer and like it. Too answer your question, I fine that two minuets is usually more then enough time under normal conditions. If the truck had been towing or hauling a heavy load, or had been driven hard prior to parking, usually an additional two minuets is needed.

Don't sit in the truck, go get the grub and a Cool-Down timer.

 

[GFritsch]

My 94 was never given the courtesy of idle after running. 200k it was still o. k. I have heard another alternative to cool down timer is a preluber. Need to learn more about that.

 

[RankRam]

y-knot I was thinking two minutes would be too long as well. Do you know if it can be activated about a minute before you make your stop. Then it would only idle for about a minute and shutdown when you were out of the truck.



I hope this makes sense.



I'm going to be in Payson, Ut. on the seventh of August and plan to buy one of these timers then.

 

[John - K5AWO]

I think it would be preferable to just monitor the pyro temp and shut it down when it reaches 300*



Don't have my guages in yet, so If I have been running it hard, I just leave it idling, hit the clicker to lock it up, and go inside. Return in a few minutes and shut 'er off.

 

[A Johnson]

Somebody makes a dual pyro, a lot of v-12 marine use them, one for each bank. You can get single needle with a switch that switches to as many channels as you want as a lot of the high horespower stuff has individual cylinder probes.

Try ISSPRO or somebody else that makes pyro's.



A Johnson

 

[jtisdale]

Originally posted by RankRam

y-knot I was thinking two minutes would be too long as well. Do you know if it can be activated about a minute before you make your stop. Then it would only idle for about a minute and shutdown when you were out of the truck.



I hope this makes sense.



I'm going to be in Payson, Ut. on the seventh of August and plan to buy one of these timers then.

I have the same timer, and I really like it. Yes you can set it early continue driving to you destination. But, you cant have it grounded through the emergency brake to do this. PM for any more questions. There is a way to take another pyro and a switch, and just use one gauge to get both pre and post egts, but I dont know how to hook it up yet.

 

[CumminsPower98]

I personally think 300º is overkill. I generally try to get about 350º pre, which is about 400º post. I have done this for years. At one point I rebuilt my turbo and it was completely clean inside where the oil runs with no coaking. Of course I run Amsoil but who knows what oil was used or how it was treated the first 70k before I got it.



I run two thermocouples with one gauge and a switch. It's real easy to wire and works great. Just use a Double-Pole Double-Throw type switch. I used a mini DPDT switch I found at Radio Shack and soldered all connections to the switch to insure no loss of signal from the thermocouples. I mounted the switch right next to the Pyrometer in the A-pillar mount.