05 Towing - EGT Questions

[shorthorn]

I have a bone stock 05 QCLB cummins, 4x4, 3.73 gears if it matters... I do not have any gauges on it yet. Pulling my 30' 7000lb travel trailer, the trans loves to stay in OD. I am worried alittle bit about EGT's as this truck is pulling at 1400-1600 RPM going down the highway?

It does pull it fine there I am just curuious if anyone pulling in a similiar condition with EGT gauge can tell me what their EGT's are...If it is even close enough to a problem to be concerned or not.

Thanks in advance.

 

[Prairie Dog]

If your at that high of temp just running down the road then something is very wrong. I pull a 8000# TT and just cruising down the highway I'm at 600~900. I don't even see temps as high as yours when pulling mountain passes.
I'm curious, what does it idle at?
How is the power? Normal?

I suspect either your gauge is way off (or you would have fried it by now) or you have a boost leak in your intercooler plumbing. A boost gauge would be very handy right now.
I would not keep driving it that way!

Scott

 

[crabman]

Santa should give you one of these for Christmas.>http://www.genosgarage.com/EDGE-INS...SEL-OBDII/productinfo/EDGE-83830/#.VJRUxB0ZZA

 

[RustyJC]

If your at that high of temp just running down the road then something is very wrong. I pull a 8000# TT and just cruising down the highway I'm at 600~900. I don't even see temps as high as yours when pulling mountain passes.

The OP says he's pulling at 1400-1600 RPM, not 1400-1600 degF EGT. He says he doesn't have a pyrometer (or any other gauges).

Rusty

 

[shorthorn]

The OP says he's pulling at 1400-1600 RPM, not 1400-1600 degF EGT. He says he doesn't have a pyrometer (or any other gauges).

Rusty

You are correct Rusty... I am just wondering what others are seeing for EGT when pulling around 7k on flat road... Lets say at 60 MPH in OD.

 

[6speed]

I'm right at 26K and temps are 900-1000 at 2100. However I have a Gear Vendors behind my manaul 6Sp. I tow in 5th and overdrive it. Trans runs way to hot in OD, 235+ When in 5th and overdrive 180-190. Pulling your weight I wouldn't be too concerned but you are lugging a little IMHO.

 

[cerberusiam]

At 1400-1600 rpms the engine is 40-50% defueled from what it woud be at 1900-2000 rpms with the same load. You won't get it hot enough to worry about and it won't hold OD if it lugs too much.

 

[BillDriscoll]

I'm assuming you at least have your Tow/Haul button engaged. I'd be more worried about the transmission than the motor. the T/H should at least lock up your torque converter right? I have the same truck except sb but with 4.10 gears and have no issues but I have no guages either.

 

[cerberusiam]

TC locks whether or not the TH is engaged regardless of rpm. If it goes into OD it locks the TC almost immediately. The factory programming won't let the trans hurt itself.

 

[Blu-meanie]

I run 800ish in sixth gear at 60 MPH. Not quite stock just a Smarty.

 

[Prairie Dog]

The OP says he's pulling at 1400-1600 RPM, not 1400-1600 degF EGT. He says he doesn't have a pyrometer (or any other gauges).

Rusty

Oops, thanks for pointing that out. I feel better for the OP now!

 

[gerry]

While I think in a stock truck you are pretty safe I am a firm believer in a trans temp and egt guage regardless. I think this is more warranted as your towing weight increases. Just my opinion.

 

[BillDriscoll]

TC locks whether or not the TH is engaged regardless of rpm. If it goes into OD it locks the TC almost immediately. The factory programming won't let the trans hurt itself.

So what does the T/H button do them......

 

[cerberusiam]

So what does the T/H button do them......

On the 05+ trucks it changes the shift and lockup algorithms to be more aggressive. The shifts points are extended a bit and firmed up due to higher TV pressure, just like advancing the TV cable does. With lockup and OD they are engaged sooner and more aggressively.

 

[SDputter]

My 05 is stock except for the exhaust brake addition. I pull a 17K# trailer up and over the mountains east of San Diego with grades upto 6%. A couple of years ago I put a cheap 3 in 1 gauge to for transmission temps. I think the EGT gauge is fairly accurate as it shows 2-300 degrees at idle and 5-800 under normal driving. However, when I'm pulling those 6% grades, WFO, my gauge shows EGT upto 1500 degrees....for like 5 minutes+, 4 times a trip. Been towing like this for 7 years, 12-15 trips/year. The only problem I've had is the exhuast manifold didn't like that. I now have an aftermarket 2 piece manifold. I was concerned about hitting 1500 for several minutes and asked around here.....didn't sound like it was a worry if the motor is stock.

 

[AH64ID]

If it's got stock tuning then drive it.

You really don't want to know what the EGT's are, as they run stupid hot on 04.5-07's in stock form. It's an emissions thing, as the cylinder temps are actually lower than earlier trucks.

1450° is not uncommon, but it's normal and acceptable.

You can run up any grade at 1450°+ and be fine in stock form, but throw some timing at it and you can melt something. I only run up to 1250° with my modded motor before downshifting, which I rarely have to do for EGT's.

 

[CToney]

How much would a cam lower egt with just the addition of it? With no Cat to keep hot a freer flowing engine would drop egt a lot and spoolup a turbo better. I'm really curious about putting one in my 05. A buddy put a colt cam in his 10 6.7 and can't get egt over 900 at WOT (not towing) and cruising at 60 mph does 6 psi and <600 F with a CC DRW 6sp. That is better than before and his milage has gone up. Power is instantaneous too. His truck has H&S with deletes. Would a 04.5-07 see this kind of change?

 

[AH64ID]

Not too much.

The cat has very little effect on running EGT's, I only noticed a decrease in time to cool off at idle.

I love the cam in my 05. Not sure on your buddies '10, seems a little much. What were his EGT's before.

Mileage is up, spool is up, boost is down (good thing), and EGT's are slightly down but nothing like that.

I have ran 2 different cams, once Colt and now a Hamilton... both are on the mild side, but they just don't move that much more intake air. More exhaust air can also mean higher EGT's, I know that the stage 2 colt ran slightly higher egts than the stage 1 at certain loads due to the increased exhaust for the same intake.

 

[lpennock]

My 05 is stock except for the exhaust brake addition. I pull a 17K# trailer up and over the mountains east of San Diego with grades upto 6%. A couple of years ago I put a cheap 3 in 1 gauge to for transmission temps. I think the EGT gauge is fairly accurate as it shows 2-300 degrees at idle and 5-800 under normal driving. However, when I'm pulling those 6% grades, WFO, my gauge shows EGT upto 1500 degrees....for like 5 minutes+, 4 times a trip. Been towing like this for 7 years, 12-15 trips/year. The only problem I've had is the exhuast manifold didn't like that. I now have an aftermarket 2 piece manifold. I was concerned about hitting 1500 for several minutes and asked around here.....didn't sound like it was a worry if the motor is stock.

Must be a glow shift guage. if it is only reading 200-300 at a idle it is telling you a lie. Put a IR gauge on the manifold and you will find that surface temp is hotter than that. (depending on time of year that is)

 

[AH64ID]

Must be a glow shift guage. if it is only reading 200-300 at a idle it is telling you a lie. Put a IR gauge on the manifold and you will find that surface temp is hotter than that. (depending on time of year that is)

200-300 at idle seems about right to me. That's with 3 different pyro's, 2 different manifold, 2 different turbos, 2 different cams, and two sizes of injectors.

In the summer, or with a winter front, it can take longer to get there but a stabilized idle has always been about 225-250°, and the post turbo is about 25-50° behind that once stabilized.