I already have 4" exhaust... but my speed is limited by EGT's when towing heavy fifth wheel up steep slopes (eng/trans could easily pull faster, but I'm conservative when it comes to EGT temps). QUESTION: What is the next easiest/simplest/cheepest modification that will result in significantly lower EGT temps? All suggestions welcome...

FYI: Related thread in which this was discussed indirectly:
http://dieselplace.com/forum/showthread.php?t=37179

Thanks,
Paul.

Remove Probe from manifold, plug the hole.

Then drill and tap for the probe in the exhaust tip.
Reinstall probe.


Presto! Much lower EGT's:joke: :lol:


You can do a 4" exhaust (good for 150F reduction in EGT's)
You can do an intake (but for a 25F drop in EGT's the cost benefit ratio is poor)

You need more air, plain and simple, or change the tune to something that does not make as much heat.

In my neck of the woods towing at rated GVW, I could hit 1400F on our mountain passes. With a stock truck! (other than the gauges)

A bigger Turbo or Twins will net you the most EGT reduction.

In my neck of the woods towing at rated GVW, I could hit 1400F on our mountain passes. With a stock truck! (other than the gauges) A bigger Turbo or Twins will net you the most EGT reduction.

Hey Juice: Are you in the Canadian Rockies, or are you in Alaska? Never been to Alaska, but next to the Swiss Alps, the Canadian Rockies are the most beautiful and impressive moutains I've seen-- next best on this continent would be Glacier NP, then the Tetons, then Colorado Rockies, then Sierra Nevadas. You are SO correct about EGTs in the mountains. Some folks have never towed heavy in them and cannot relate to the strain, both from very long steep grades AND higher elevations (less air).

Why are twin turbos so expensive? How much does the turbo unit itself cost? Is it a laborious installation?

Paul.

Hey Juice: Are you in the Canadian Rockies, or are you in Alaska? Never been to Alaska, but next to the Swiss Alps, the Canadian Rockies are the most beautiful and impressive moutains I've seen-- next best on this continent would be Glacier NP, then the Tetons, then Colorado Rockies, then Sierra Nevadas. You are SO correct about EGTs in the mountains. Some folks have never towed heavy in them and cannot relate to the strain, both from very long steep grades AND higher elevations (less air).

Why are twin turbos so expensive? How much does the turbo unit itself cost? Is it a laborious installation?

Paul.

Paul, I live right in the heart of the Rockies Mountain Range, and the Purcell Mountain Range. Hill climbing almost daily! I have a great view of them from my house.

I do not know what the Turbo itself costs, but the plumbing chews up some $$$$ as it is fairly intricate as far as the welding is concerned. Labour to install a full kit would probably run 10 hours by the time the stuff in the engine comp is relocated.

On a related note, the second turbo does not heat the air like the stock turbo does.... I have removed all extra fuel and run the same 20PSIG as a stock truck and still have markedly lower EGT's while towing!
Of course, I only did that test a couple times.... Towing with stock fuelling is such a bore.... it is more gooder fun to see the looks on other drivers when you pass them up the mountain... with a loaded trailer!:grd:

PS look up Cranbrook B.C. That's where I hang my hat!

Paul, I live right in the heart of the Rockies Mountain Range, and the Purcell Mountain Range. Hill climbing almost daily! I have a great view of them from my house... PS look up Cranbrook B.C. That's where I hang my hat!

I looked on the map... yep, you live near all kinds of unbelievably spectacular scenery... we are planning to vacation in Glacier NP (USA), and the Canadian Rockies next July (Banff, Yoho, Jasper and Mt Robson Provincial Park). Do you like to hike? Any particular trails that you'd recommend-- we primarily dayhike when we go on vacation (10-15 miles per day is our speed).

On a related note, the second turbo does not heat the air like the stock turbo does.... I have removed all extra fuel and run the same 20PSIG as a stock truck and still have markedly lower EGT's while towing! Of course, I only did that test a couple times.... Towing with stock fuelling is such a bore.... it is more gooder fun to see the looks on other drivers when you pass them up the mountain... with a loaded trailer!

Well, if I don't do something, you may be having fun looking at my face next summer as you pass ME by! BTW: What do you mean when you say "I have removed all extra fuel...?" And why does the stock turbo "heat the air"...? Is this to help with combustion? My assumption is that heated air translates to hotter EGTs, and the fact that the second turbo is NOT heated translates to cooler EGTs...?

Paul.

I looked on the map... yep, you live near all kinds of unbelievably spectacular scenery... we are planning to vacation in Glacier NP (USA), and the Canadian Rockies next July (Banff, Yoho, Jasper and Mt Robson Provincial Park). Do you like to hike? Any particular trails that you'd recommend-- we primarily dayhike when we go on vacation (10-15 miles per day is our speed).



Well, if I don't do something, you may be having fun looking at my face next summer as you pass ME by! BTW: What do you mean when you say "I have removed all extra fuel...?" And why does the stock turbo "heat the air"...? Is this to help with combustion? My assumption is that heated air translates to hotter EGTs, and the fact that the second turbo is NOT heated translates to cooler EGTs...?

Paul.

I removed all fuelling boxes and tunes.... so i was running stock fuel with the Twins... just to see what it would do, and to get an idea of EGT's for people who are looking to purchase a Banks Intercooler.

Turbochargers compress the air, and as you compress air it gets hot. (one of the reasons Charge Air Cooling is needed) Smaller turbochargers heat the air more than larger compressors for a given level of boost, and you lose air density as temperature goes up. Larger turbos tend to heat the air less. So there are goins to be had there, as well as on the exhaust side; the bottom turbo has a larger housing.

On the Twin setup the top (stock) charger is wastegated around 7-9 PSI.. well within its map of efficiency from an adiabatic (air heating ) standpoint. At 7 PSI the bottom charger is starting to light and by 9PSI... It's all Bottom Charger!

As far as hiking, I used to, but i now tend to ride the horses for some recreation.

But, if you are up in my neck of the woods, give me a call.... Warm Drinks and Cold food are on me!

Plenty of room for any size trailer, Full hookups W/S/E

Absinthe too!

Oh, and if you wanted to take the Farm Truck for a spin, by all means you would be welcome to!

I pull a 15k 5th wheel over much of the same territory your headed toward, and have the same concerns. To my understanding, a water/methanol injection system might be a reasonable next step to lower EGT. Check http://www.snowperformance.net/. Also, try the Search feature on this forum.

Maybe you're overly conservative on your EGT limit. Banks & Edge have done a fair amount of dyno and road testing and talk about 1300 - 1350 degrees limit for towing. Their websites, particularily Banks, have good info on EGT. I've used 1300 for a couple of years now and I belive I'm conservative. My Juice/Attitude does back off on a 6% grade though.

Hope this helps.