Excessive EGT's

[DogramTD]

A bit baffled. Currently on a trip; in yellowstone with a destination of Glacier Mt. No matter what Smarty CaTcher# I use or adjustment option, the truck will always see 1400 - 1450* EGT while pulling a grade w/13K# in tow; this is even when set to stock tune. When tuned to stock, even pulling at 8000 ft elevation, there almost NO smoke. BTW this happens even at 6000 ft elevation... I have just started ignoring the gauge since I cant drop the numbers no matter what I do.



Any thoughts... maybe bad guage (isspro Ev2)... maybe Ex manifold probe location (AFE)... or is this happening to others as well. My buddy is pulling his trailer on our trip along with me and only seeing 1100 - 1200* all stock with the Smarty Jr tune

 

[BGlidewell]

I've been over 8K pulling trailers and had to manage the throttle a bit but was able to keep it well below 1000. Possible gauge issue? Where is the pyro?

 

[DogramTD]

pre-turbo in a pre-cast bung on the AFE; on this manifold it is where 4, 5 & 6 come together.



No matter how much managing I do, I cant get it that low... heck I wouldnt make it up the hill!

 

[Prairie Dog]

Could be a boost leak - are you monitoring boost levels?

 

[Sandflea]

I'm running completely stock, and I've always had trouble keeping the EGT's under control when pulling my FW. My home in NW New Mexico is at is 5300' and I often camp near Silverton, CO which is at 9308', crossing 2 passes at 10,640' and 10,910'. I try to keep the EGT's below 1450', but that keeps my speed down to about 20 mph when pulling the longer grades. I routinely get passed by other campers pulling even larger FW's. Either they don't have gauges, or they don't have high EGT issues. My Autometer C2 EGT gauge is plumbed into the EM, just below where the 4, 5, and 6 manifold tubes come together.



If you want to check the accuracy of your gauge, call Isspro and have them give you the mV calibration data for your model gauge across its full range. Tie into the gauge with a multimeter, and have someone check and write down the mV readings as you call out the EGT readings from the gauge. Analog gauges are not going to read instantaneous EGT values perfectly, but it will give you an idea if your gauge is reading too high.

 

[JeffJackson]

I use a Smarty Jr and on the Tow setting regularly see 1400 going uphill. Last year I had to slow down to about 55mph to keep the exhaust temperature in check on one long 6% climb and found that my air filter was dirty afterward. Have you checked your air filter yet?

 

[LNaugle]

definitely check your probe. what egt does truck idle at? i recognize you have a problem but that motor was built to maintain 1400-1450 egts... have proved it more than once towing out of phoenix to flagstaff with 2 rockcrawlers on a fifth wheel. still no problems with that particular truck. one time we passed a power joke pulling a 3 car hauler which was empty... . should have seen the look on his face!

 

[DogramTD]

Could be a boost leak - are you monitoring boost levels?

yes, boost levels are good... roughly 36 PSI at this temp... Stock tune. I have ran a TNT tune (lvl 4) and reached about 48#'s of boost... right about where the WG is set

I use a Smarty Jr and on the Tow setting regularly see 1400 going uphill. Last year I had to slow down to about 55mph to keep the exhaust temperature in check on one long 6% climb and found that my air filter was dirty afterward. Have you checked your air filter yet?

Filter is good

definitely check your probe. what egt does truck idle at? i recognize you have a problem but that motor was built to maintain 1400-1450 egts... have proved it more than once towing out of phoenix to flagstaff with 2 rockcrawlers on a fifth wheel. still no problems with that particular truck. one time we passed a power joke pulling a 3 car hauler which was empty... . should have seen the look on his face!

Idle at roughly 350 - 400*

 

[cerberusiam]

From your signature, if thats what is on your truck, its pretty easy to see why given the probe is good. If you are seeing 1400-1500 with Smarty on and timing advanced your on the ragged edge of problems.



Too much fuel and not enough air is likely the problem.



What rpms are you seeing these temps?



Towing at elevation is a challenge and with a turbo that is somewhat suspect it will show big time in the EGT readings. Simply not enough oxygen being sucked in to balance the fuel.



Drop some $$ on a good turbo and you will likely see a difference.

 

[DogramTD]

cerb... 60 hp injectors with the 63/68... a month ago I had a stock turbo on the truck and was barely seeing these temps. As I said... tuned at STOCK with no added fueling besides injectors, I am making NO smoke and the temps are way high... myh buddy is towing right behind me with all stock motor besides the smary jr. tuned at 70 hp... barely making 1100*.



You dont agree that the added turbo size makes up for the small increase in injectors?... making no smoke...

 

[cerberusiam]

Nope, think your turbo is the problem. The injectors are not too much but the air is not good enough and it tipped the balance. The 14 housing is simply too large to support the existing exhaust flow.



If all you did was swap the turbo thats a pretty good indication. The stocker runs out of map and drives the DP too high after a certain point but it does an excellent job in the range it is designed for.



What rpms are you seeing those temps at? What happens when drop OD and run it at 2800-2900 rpms?

 

[DogramTD]

2700 rpm, 3rd gear

 

[cerberusiam]

Boost at that point? What are the EGT's and boost running in OD?



Is this mainly on grades its an issue or are you having trouble holding temps down on level to rolling ground at altitude?

 

[DogramTD]

Typo... I meant 2700 rpm, 2nd gear, 36# boost, 40 mph. Flat ground no wind OD 75 mph... egts are 800 - 1000*

Temps always seem warmer than they should be even when unloaded... but this is excessive.



Had to send from my phone... pc won't go to this link.

 

[cerberusiam]

Doesn't sound like that turbo is making very good air at higher rpm's and fueling is over running the air. The flat ground in OD sounds about right and you will see the highest EGT's at higher rpms.



Is that WOT in 2nd gear or just maintaing speed at about 3/4 throttle?

 

[DogramTD]

I spent a lot of $$ on a good turbo... I still am not understanding your logic; granted i am not very educated on Turbos, hence the reason I had ED size it for me based on my inputs.



These temps are both 3/4 maintaing and WOT.



It spools around 1200 rpm and boosts 36# in stock tune... no smoke... seems like I have plenty of air... I am a black and white kind of guy tho

 

[cerberusiam]

I am missing something here, please explain the differences between the stocker and this one.



I thought you said you never had EGT issues with the stock turbo in the same conditions. That would be stock tune and the 60 HP nozzles, correct?



Under the same conditions how does this turbo comapre to the stocker for EGT's and boost numbers?



Maybe I am just not understanding what the problem is.

 

[Wingate]

With the new turbo, injectors. . etc. . have you checked delta P across the intercooler? Is this the stock intercooler attempting to support all the mods and hard pulling or do you have an aftermarket intercooler? Is the intercooler clean?

Bigger turbos and stacking more SCFM requires the I/C to work harder... Higher inlet air will definitely cause EGT to spike when working hard.

Just some random thoughts. .

 

[NIsaacs]

Is it possible your exhaust brake is sticking or partly closed?



Nick

 

[DogramTD]

I am missing something here, please explain the differences between the stocker and this one.



I thought you said you never had EGT issues with the stock turbo in the same conditions. That would be stock tune and the 60 HP nozzles, correct?



Under the same conditions how does this turbo comapre to the stocker for EGT's and boost numbers?



Maybe I am just not understanding what the problem is.

I dont think I said I never had heat issues with the stock turbo, but They werent as bad as now. When I moved to Cheyenne, my trailer was 16,400#; with the stock turbo and SW3 tune, i pulled laramie grade (8000-ish elevation) at 1300* @ 55MPH in 3rd (roughly 2000 RPM) couldve pulled faster but was throttling based on heat. Now, I dont think i could do that at 12K# W/O egt's over the top even in stock tune. Yes, only diffefrence is the turbo. And thats where I dont understand that if I can spool it at 1200 RPM and create 36# of boost in stock tune with no smoke... why would it be worse than before?



I bought this turbo to replace the stocker which was starting to howl, as well as to compliment my modifications and remove heat better while towing... I'm not a racer. I have put in a call to Chris at ED, just awaiting the return. We have spoken a few times over barking and heat issues with this turbo in the past. I think EFI live will do wonders for Bob (my truck)

With the new turbo, injectors. . etc. . have you checked delta P across the intercooler? Is this the stock intercooler attempting to support all the mods and hard pulling or do you have an aftermarket intercooler? Is the intercooler clean?

Bigger turbos and stacking more SCFM requires the I/C to work harder... Higher inlet air will definitely cause EGT to spike when working hard.

Just some random thoughts. .

My buddy and i were talking about this a couple days ago, he has an aftermarket where as I have a stock intercooler. I have not checked the Delta P across the intercooler, would have to take it somewhere as i dont have the capability for this.

Is it possible your exhaust brake is sticking or partly closed?



Nick

No, its cycling freely; no noticed loss of power. I have had it stick in the closed position before on the I25/I80 interchange... that was not a fun experience. Absolutely no power and rattling like crazy! The solenoid didnt release the pressure; it was a fluke occurance.