Turbo cool-down

[24V-DSL]

Before I got my gauges I would always idle for approx. 2 minutes after normal driving to hopefully, safely cool down the turbo (read this in archives)

Now that I have gauges, pre-turbo, I notice that I can sometimes get to 250 degrees in less than a minute, so I have been shutting down going by the pyro, and not waiting any longer than it takes to get to 250. No towing... . just everyday driving.

Is this ok, or does more idle time have an effect on preventing coking (sp)??



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White 2001. 5 2500 ST, SWB, 4X4,QC, AUTO, 4. 10's, LSD, 285/75/16 On Weld Outbacks, PIAA 510's, Line-x, Tinted glass, Redline 85+, Blow-by-bye, RE-0880 & 25-0880,muffler fell off,level truck with 2" tuff country kit, Bilsteins at the corners, Di Pricol egt and boost, Mag-hytec "original flavor" transmission pan and Dana 70 diff. cover, Westin Step Bars,DTT TC/VB,yeee-ha,EZ, Custom Plate 24V-DSL

 

[John]

If your pyrometer gauge is accurate, waiting until your temps. reach 250 degrees F. is more than adequate.

..... still, nothing beats the POST turbo location for safe shutdown temps.

 

[Vaman]

John, John, John... please, please don't bring up the pre/post turbo issue again.

I agree with you by the way... lol

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98. 5 2500, 24v, 5 speed, QC, 4x4, 4. 10 LSD, short bed, Line-X liner, tow package, camper suspension, Westin nerfs, camper shell, TST PowerMax Competition, 275 RVs, Psychotty air, HX-40, 4" straight pipe exhaust, Southbend clutch, ProComp A/T 305/70/R16s, EGT/Boost/Fuel pressure pillar gauges, Grover air horns... Love my Cummins, no love for Dodge

 

[CCahill]

I asked this ? a while back also... . The consensus is too cool down to -400 or so ... allthough 1 member had an interesting post about turbo life if you don't..... something like 300k, if I can remember right... . so ... ... the time you sit there and let it cool down is your decision to make... (I wait till it's at least 375+-)


BTW... can you hook up the Isspro Turbo Timer with guages other than Isspro?


Colin

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2001 Quad,4x4,AT,4. 10LS,LB,Loaded enough,stock,mostly... . 65 Chevelle sedan, Hella nice driver, 53 Nash Rambler Convt,1 of 653 built,[not a Metro], GM drivetrain, injection, and auto/od
Specialized FSR PRO Stumpjumper,Cannondale F2000, Loaded
MTD Lawn tractor with flames Cummins ISB
12' fishin' boat, loaded. .
Yanmar FX265D 4WD desiel tractor

 

[Steve St.Laurent]

CCahill - as long as you have a K-type thermocouple the Isspro turbo monitor will work with it.



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-Steve St. Laurent - President of the Great Lakes TDR
'98 QC LB (CMNSPWR), 4x4, ISB, 5sp, 4. 10 LSD, TST Powermax3, 275hp RV injectors, Joe Donnelly modifed Sachs Clutch, SS ladder bars, SW fuel pressure gauge, BD exhaust brake, Isspro turbo temp monitor, front Draw-Tite receiver, rear Draw-Tite class V receiver, BFG 285/75R16 AT KO's, (all the common stuff clipped)

 

[Big-D]

For me there is nothing like having the best of both worlds... pre & post temperature readings. Easily accomplished with only one guage, a switch and two EGT probes. Dave

 

[PUFF00]

Has anyone heard of someone monitoring the temp. of the oil draining out of the turbo? This seems like the best temp to monitor when considering shut-down.

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2001. 5 3500 QC 4X4 6-speed HO 3. 55 blackhttp://www.flash.net/~dpuffer/rig03a.jpg
1998 Jeep TJ black http://www.nm4w.org/members/puffer.htm

 

[EMDDIESEL]

Just 300 degrees on the EGT gauge and you can shut down. You wont have any problems. I imagaine you could put an oil temp sender in the return oil line from the Turbo. But there is really no need for it, the EGT serves two functions, shutdown temp readings and high EGT readings when towing, etc.

 

[Sky]

My pyro is post-turbo and i make alot of stops in a day delivering etc... It takes for ever to get from 400 to 300 so half the time im shutting it off at about 375, what is the rec. post turbo shut down?

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2001 QuadCab,SWB,Auto, 4X4,4" Flowmaster Raceing Exhaust, DTT TC & VB, EZ Box, Bosch 275 Injectors, Mag-Hytech transmission pan/Dana 70, K&N, Autometer pyro/boots guages, Eclipse cd player, Boston Pro componet speakers, 2 Solo Baric Subs, 33" BFG AT'S... ... .....

 

[LSMITH]

Sky, high idle at 1200 RPM or so and it will cool off a lot faster than at normal idle speed. I will not shut mine off until I see 300* or less.

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99 2500 QC 4X4 AUTO SB 24V LARAMIE SLT 3. 5 LSD 285-75-16'S SPA Boost/EGT Rancho 9000's Everything but leather NRA Member Great Lakes TDR Member

 

[Bigsaint]

I'm with LSMITH on this one. I always let mine get below 300, pre-turbo and try to wait for 250, if time permits. Probably overkill, but it's just all the longer that I get to sit in the truck and hear the mighty Cummins #ad


Scott W.

White 2001. 5 3500 ETH/DEE 4X4 Quad cab SLT,tow package and camper prep,Husky liners front and rear,DiPricol pyro,boost and oil temp gauges,SPA fuel pressure and temp. gauge,Edge EZ,Psychotty air,Bully Dog stage III injectors,ATS 3 piece manifold,HX40 turbo,4" BD exhaust,4" BD E-brake,McLeod clutch,Mallory 4150 lift pump,Mag-Hytec rear,Go-Rhino grill guard,Lund bug shield,PM tractor utility back up lights,Penda bed mat,365. 8 HP on the dyno and blow by bottle is bye bye !!! I love the smell of diesel in the morning, it reminds me of... . VICTORY !!!
<A HREF="http://albums.photopoint.com/j/AlbumIndex?u=1231655&a=9089608" TARGET=_blank><font color=red>My Truck</font></A>
<A HREF="http://albums.photopoint.com/j/AlbumIndex?u=1231655&a=9089604" TARGET=_blank><font color=red>THE SAINTS</font></A>

 

[Koa Man]

Sky, are you running the A/C while waiting for the EGT to get to 300? If so, try turning off the A/C and the temps should drop a lot faster.

 

[BigMike]

I find that mine cools to 300 degrees almost instantaneously. No wait required. If I'm towing, I just idle on in to wherever I'm stopping and it's ususally at 300 when I stop. If it isn't, it takes a long time at idle to cool down.

Guages really take all the guess work out. Wouldn't be without them.

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1999, 2500,4X4,QC,5spd, KN Filter,VA Box,4" Exhaust, Piller Mount Pyro & Boost Guages, BD Exhaust Brake, Bugshield w/eyebrows. Bedliner, Diamond Plated Rail Protectors, Better Built tool box, Rear Flaps.
Pull a 2000 30. 5' Terry Manor 5er.

 

[WCrovo]

I really need to get an EGT temp gauge. This quess work stuff is giving me a hard time. Guessing the proper tourque without a tourque wrench is probably more accurate. I guess I'll do a search to see wich one is best. I've read about one that seemed to be a problem, if I rember correctly. Makes you wonder why none of the Big 3 has them as standard equipment on their diesels. I've been spitting on the outlet of the turbo and counting how long it sizzled before I would shut it off.

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2001 2500 tow, camper, SWB, ETH/DEE, 3. 54 Bright white,4 wheel discs.

 

[JJMiller]

I have a dual pre/post egt guage, and since I installed it I have never seen the post-turbo reading be higher than the pre-turbo reading. This is on a completely stock truck doing around-town and interstate driving.

As soon as I come off the pedal, both EGTs start dropping, and the pre- is always hotter than the -post. When I'm cooling down, I shut off at 300* pre, which usually is about 250* post.

--J

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John Miller

'01 2500 Quad Cab, ETC-DDX, SLT, Long Bed 4X4, Tow, Travel, 3. 54, Camper spl, Forest Green, Line-X
bed liner, silencer ring removed, ISSPRO 2-50# boost, Westach 0-30# fuel pressure (should have ordered the 0-15), Westach dual EGT (200*-1400*).

Next up: 275's, PE-EZ, or PE-Comp

 

[radixr]

jj,

I suspect one of your gauges is not reading correctly. My post turbo reading is always a little higher than the pre turbo during cool down for a while. Try switching thermocouples and see if you get the same results.

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1996 Dodge 2500 4X4 SC, SLT,Cummins 12V, 5-spd. , JRE 4" exhaust (my kitty ran away into the woods and the muffler fell off!), TST 280 HP/685 Ft-Lb Uprate Kit, AFC Spring Kit, ATS 3-piece Exhaust Manifold, Chrome Valve Covers, Horton Fan Clutch, Jacobs/Ram Exhaust Brake, MagHytec Differential Cover, Prime-Loc, Rancho RS9000 Shocks, Combo Gauge, K&N Air Filter, Brite-Box, Geno's finger-touch oil pan drain plug, Optima Yellow Tops, no turbo silencer ring, full-time fog lights. As of 5-19-01, 68,522 miles.

 

[Michael Hughes]

I would agree with radixr, I have both pre and post turbo probes, pre always drops faster then post. I have found that you never know when it is going to take 2+ minutes to get post tempature down below 300. That why I put two probes in.

If anyone is looking to install dual Weatach probes and one gauge, take a look at the <A HREF=http://www.showmestate.org/stltdr/how-tos/EGT_how_to.shtml>How to</A> that I wrote up.

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1999 2500 ST LB 4X4 Metallic Red, 5-speed, 3. 54 gears, LSD, camper and tow package
Westach Boost/EGT (pre and post turbo) mounted on A pillar.