shutdown temps

[SlyBones]

Well finally after 2 months of sitting on my dash, having not moved, my pyro is now displaying as it should. Thanks NW BOMBers.

So instruct me in the art of shutdown temp monitoring. I hear (read) 300 degrees is the magic number. My pyro is PRE turbo. Is that it, just wait til she gets down there? Click off, your done.

I guess I wonder because the manual talks about waiting 1 to several minutes depending on conditions, and up to 5 minutes after towing a heavy load up a long grade, etc. Well I have yet to tow my RV since I got this hooked up, but my 1 week of experience shows the temps on this drop fairly fast. Waiting several minutes?? Seems like the first 10-20 seconds covers it and from there I would just be staring at the gauge straining to see it move.



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1997 2500 4x4, CC, Auto, 3. 54 LSD, 68K, Everything inc Leather, K&N, 4" BD cat-back, otherwise stock, Isspro Gauges(3), 285/75/16 on Alcola's, RS9000's, Molded Side Steps w/ Ground Effects, Chrome Trim, Canopy, ProFlaps F&R, BedLiner, Aux. Lighting F&R, and tons more.

 

[DieselDog]

300 is the magic number, so I'm told, but who wants to wait ??!! If you check www.dieselpage.com and look under ISSPRO guages, you'll see they make a "Turbo Temp Monitor". With this sensor installed, you can pull up and just turn the key off. It's wired into your ignition and pyrometer and at the magic number (temp) it shuts the engine off !! GENOS sells one that is a timer, but this one shuts it down based on temp, which is better I guess. That's the next control I'm putting on mine. Just thought I'd let you know.

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'96 12valve 4x4, White SLT Long Bed. Kenwood CD player w/100 watt custom made subwoofer built under back seat. DTT TC & VB (WOW !!) TST #8 (230/605). Moster tip from GENO'S, ISSPRO Guages on the "A" pillar. "TNT" sprayed in bedliner-and sprayed along lower rocker panel and in the front door threshold. Off to a good start!! MORE TO COME !!

 

[RHARVEY]

My pyro probe is also pre-turbo and it doesn't take that long for the temp to drop below 300. I drive 17 miles to work at temps of 500-550*, and after coming off the freeway and driving 4 blocks at 40 mph and pull into the parking lot at work the temp is 275*.
I do have Scott's air induction system and also straight pipe which I have heard will help the cool down. Other than that the truck is running the stock plate and injectors.

Rick

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RICK
97 2500,CC,5 SPEED, 3. 54 Limited Slip,Psychotty System,K&N, Pre-Turbo ISSPRO 3" Pyrometer & Boost Guage,Silencer Ring Removed
15,000 RBW 5th Wheel Hitch,25' Excel 5th Wheel,Rancho RSX17000 Shocks,Amsoil Dealer,Straight Piped

 

[Jeff Burke]

When I go into work, I can pull into the parking lot and shutdown with no concerns. When I go home, I pull a fair hill for about 5 1/2 miles. It takes at least 3 mins. for my temp to get down then.

 

[Champane Flight]

I believe this is one of the hazards of pre-turbo probe installation. In the big rigs (almost all have post turbo installation)we wait till 600'before shutdown. Of course every rig is a little different(distance from turbo to probe). But be advised that pre turbo readings are not what your turbo temps are.

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95 Dodge 2500 Luverne grill guard,headache rack,running boards and Amzoiled. Soon to be mildly bombed. 84 Dodge d-150, 318 Hooker headers,Edelbrok intake,mallory ignition,Carter Afb,Accel coil,and Custom dual exhaust. Boat,fifthwheel,motorcycles,and shop. 72000 as of 3/1/01,not even broke in yet. Old Dodge 126000 miles and running better than new.

 

[RHARVEY]

Isn't there about 200* difference from post to pre? With being pre turbo and waiting until it reads below 300*, shutdown temps should be in the acceptable range,right?

Rick

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RICK
97 2500,CC,5 SPEED, 3. 54 Limited Slip,Psychotty System,K&N, Pre-Turbo ISSPRO 3" Pyrometer & Boost Guage,Silencer Ring Removed
15,000 RBW 5th Wheel Hitch,25' Excel 5th Wheel,Rancho RSX17000 Shocks,Amsoil Dealer,Straight Piped

 

[DocStressor]

The critical factor is the temperature at the turbo bearing. With a pre-turbo sensor, you are measuring the EGT in the exhaust manifold, not the temp of the bearing. The pre-turbo temp decreases very rapidly as soon as you take the load off the engine, just as in increases very rapidly when you put a load on the engine. The heat capacity the exhaust gases is about the same as air, which is much lower than that of the steel turbine itself. So it takes much longer for the turbine and the bearing to cool down to 300 degrees. I don't think that there is any simple relationship between the pre-turbo EGT and the turbine temperature. Unless you install a second post-turbo gauge for cool down purposes, I think it would be best to ignore the pre-turbo temperature reading and use the conservative cooling times suggested by Cummins.

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1999 Quad cab 2500, SB, SLT, 4X4, 5-speed, 3. 54, tow and camper package, Lance 820 camper, Lance cabover stabilizers, Rancho 9000s, Airlift airbags,Reese Titan V hitch, Mag-Hytec differential cover with Amsoil 2000 75W-90 lube, Amsoil air filter

 

[dieselburner]

Originally posted by SlyBones:
Well finally after 2 months of sitting on my dash, having not moved, my pyro is now displaying as it should. Thanks NW BOMBers.

So instruct me in the art of shutdown temp monitoring. I hear (read) 300 degrees is the magic number. My pyro is PRE turbo. Is that it, just wait til she gets down there? Click off, your done.

I guess I wonder because the manual talks about waiting 1 to several minutes depending on conditions, and up to 5 minutes after towing a heavy load up a long grade, etc. Well I have yet to tow my RV since I got this hooked up, but my 1 week of experience shows the temps on this drop fairly fast. Waiting several minutes?? Seems like the first 10-20 seconds covers it and from there I would just be staring at the gauge straining to see it move.

I tow a 13,500 pound fifth wheel and my wife and I go traveling into the sierras in CA. There is a rest stop on I80 between Sacramento and Truckee that is at the top of a long grade and at altitude. Whenever I pull in there, I need to idle my truck for over 5 minutes to cool down the temps in the manifold/turbo. I once shut down at 350 degrees and came back out to the truck and the pyro was sitting at 650. That is not good because it will cook the oil in your turbo causing "coking" which will effectively cut down on the oil flow to your bearings in the turbo. If you tow hard and fast like me, you need to watch the temperature guage with one eye and the road with the other. I will be doing some more airflow enhancements on my engine soon but in the meantime I will be watching the temps!
Steve

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1998 2500 Quad Cab, 12V, 5spd, 4x4, HD Transfer Case, 370HP Diamond B Injectors, #4 TST, 16cm2 Housing, AFC Spring Kit, BD Governor Spring Kit and other governor modifications, Walker Muffler, 285/75-16 BFG AT's, Stainless Steel Tube Steps, Reese Fifth Wheel Hitch, Leather, CD, LSD Dana 80 Rear, 60 Front, McLeod Dual Disc Clutch, Rancho RS9000 Shocks, Rancho Steering Stabilizer, ATS Exhaust Manifold, Psychotty Air Induction, BD Exhaust Brake, Enterprise Engine Delivery Valves

 

[MikeR]

Normal unloaded driving,it only takes about 20-30 seconds to cool to 300* (preturbo) and I shut it down. Even when towing the puny equipment trailer on weekends makes me have to wait about a minute an a half before it cools down to 300*.

-Mike

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'00 2500,QC,4wd,LWB,Dark Garnet,6spd,3. 54lsd,SLT,DD stage II,Psychotty air,10-level PM3,Jacobs ebrake,Isspro pyro & boost gauges,2wd-low,Airoquip fuel lines,Smittybilt nerfs,BFG 285/75 AT's
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'95 2500,Reg-cab,2wd,LWB,White/Star silver,Automatic,3. 54,SLT,Michelin 265/75