Is WOT generally required when towing? - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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  • 2 Post By JimmyD
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post #1 of 8 (permalink) Old 08-07-2019, 09:42 AM Thread Starter
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Is WOT generally required when towing?

I sent my whole set of injectors in for cleaning and testing, and a few of them failed at WOT test. Not sure what that means in terms of fuel delivery, or how it will affect towing. Truck runs great. No smoke. Etc etc.

I have a trip coming up next week, and I'll be towing a 7500 lb camper through the Canadian Rockies, with a couple good pulls. Will I be ok? Lol

Any need to go WOT? Or just kinda hang back in the slow lane if need be?

Do you ever go full cowboy when towing? Case by case basis?

I also have my pick of EFI Live enhanced stock/30hp/60hp tow. And an edge CTS with egt probe. So I'll be monitoring.

Thanks in advance.

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"Stinky Pig"
2003 Sierra 2500 Crew 4x4–Charcoal Grey Metallic
325k kms and counting
LLY Head swap
LBZ full intake w/MP
Flo-Pro Downpipe
4" Straight pipe
EGR delete
PCV Re-route
EFI Live (E. Stock/30HP/60HP Tow/high idle/No start)
Edge CTS2 with EGT
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post #2 of 8 (permalink) Old 08-07-2019, 12:27 PM
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My camper weighs more than double of what yours weighs.

Although I have never towed my camper through the Rockies, I have towed it through the mountains of TN, NC and WV.

Never, ever, ever, did I need to go WOT when going up a mountain. The truck will let you know the appropriate amount of throttle to give it. For me, going up the hills, I never put the truck over 2500 RPM. If the temps start to creep up a bit, just reduce the throttle. My truck seems to like that speed when towing the camper up the hills.

In doing this, you will be in the slow lane as others pass you. Just do the slow lane knowing that you are doing the right thing for your truck while safely towing.

The DM Ally combo is a wonderful thing, just don't abuse it and you will get many miles of safe/happy towing.
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post #3 of 8 (permalink) Old 08-07-2019, 02:32 PM
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If you were running in cruise it might have gone WOT & you might not know it. But if you weren't in cruise forget the last sentence.

04 GMC LB7 2500 SAC 45 injectors DSP5 EFI live from LDS, ported air inlet. 4" MBRP droning exhaust.
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post #4 of 8 (permalink) Old 08-07-2019, 04:26 PM
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Quote:
Originally Posted by AxysAssault View Post
I sent my whole set of injectors in for cleaning and testing, and a few of them failed at WOT test. Not sure what that means in terms of fuel delivery, or how it will affect towing. Truck runs great. No smoke. Etc etc.

I have a trip coming up next week, and I'll be towing a 7500 lb camper through the Canadian Rockies, with a couple good pulls. Will I be ok? Lol

Any need to go WOT? Or just kinda hang back in the slow lane if need be?

Do you ever go full cowboy when towing? Case by case basis?

I also have my pick of EFI Live enhanced stock/30hp/60hp tow. And an edge CTS with egt probe. So I'll be monitoring.

Thanks in advance.

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I've pulled at WOT in the mountains out west. Can't remember exactly where but I recall trying to maintain 75 mph up a steep but straight incline and the truck started to lose some speed; this is at a GCW of between 19k and 20k. If the engine is on a stock tune there's no reason to be shy about WOT (assuming it's been well maintained and there are no known heat dissipation issues); it's designed to run at maximum engine power for significant periods of time (the SAE uses different standards for eating maximum HP depending on vehicle weight class, so an L5P can sustain 445 for a longer duration without overheating than similarly-rated sports car engine), certainly enough time to ascend long grades in the Rockies.

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post #5 of 8 (permalink) Old 08-07-2019, 05:42 PM
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I've had my LLY for almost 3 years now and have NEVER been at full throttle. First I don't trust the 5speed trans to survive what the motor will put out, and if it were to downshift at WOT,, I fear I'd be looking at tow bill in my future.

Besides, My M.O. is to drive by EGT. My probe is in the rear passengers side exhaust manifold and monitor it on a EDGE CTS. I see the EGT climb on hills at even 3/4 throttle. I use 1250° as a MAX EGT and try to keep it UNDER 1150°. The pistons and heads are thermally protected by oil and engine coolant, but just keep in mind aluminum melts at 1221° F. The heads and pistons are obviously alloyed to make them survive well above that temp. BUT,, My thoughts is if the aluminum component of the material is even SLIGHTLY compromised by 1250°,, I don't want my EGT EVER going there!!!

I don't have a problem slowing down and hugging the right lane,, pulling over to let traffic by when I'm towing grades. I guess my grandfather finally wore off on me "If you need to push the truck that hard you should have left earlier"
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post #6 of 8 (permalink) Old 08-07-2019, 10:25 PM Thread Starter
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Thanks for taking the time to write such detailed replies.
This is all music to my ears. So basically just don't be an ass.

Guess it's a good test run.

Cheers

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"Stinky Pig"
2003 Sierra 2500 Crew 4x4–Charcoal Grey Metallic
325k kms and counting
LLY Head swap
LBZ full intake w/MP
Flo-Pro Downpipe
4" Straight pipe
EGR delete
PCV Re-route
EFI Live (E. Stock/30HP/60HP Tow/high idle/No start)
Edge CTS2 with EGT
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post #7 of 8 (permalink) Old 08-08-2019, 04:28 AM
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There are a couple things that will help you towing in the hills

1 change the Turbo Intake pipe to an LBZ intake. The LLY was a defective design that unnecessarily restricts the air flow.

https://www.duramaxforum.com/forum/h...-your-lly.html

2. A Turbo Brake, either in a tune or activated yourself. Either will allow you to use the TB and Cruse Control together downhill to maintain whatever speed you desire. It is MAGIC and puts a smile on your face knowing the truck is working as it should.

Here is a How To for the manual add. It is written about an LMM but the same works on the LLY:

https://www.duramaxforum.com/forum/0...lmm-works.html

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post #8 of 8 (permalink) Old 08-08-2019, 09:29 AM Thread Starter
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Quote:
Originally Posted by 407driver View Post
There are a couple things that will help you towing in the hills



1 change the Turbo Intake pipe to an LBZ intake. The LLY was a defective design that unnecessarily restricts the air flow.



https://www.duramaxforum.com/forum/h...-your-lly.html



2. A Turbo Brake, either in a tune or activated yourself. Either will allow you to use the TB and Cruse Control together downhill to maintain whatever speed you desire. It is MAGIC and puts a smile on your face knowing the truck is working as it should.



Here is a How To for the manual add. It is written about an LMM but the same works on the LLY:



https://www.duramaxforum.com/forum/0...lmm-works.html
Yup. Already have a full LBZ intake including MP, as well as turbo braking added with EFI Live.
I've used it going down some hills unloaded, and it's pretty wild. No need to touch the brakes haha.

I also replaced the factory pancake downpipe with a Flo-Pro.

Should be good to just drive it and let it do its thing.

Sent from my LG-H831 using Tapatalk

"Stinky Pig"
2003 Sierra 2500 Crew 4x4–Charcoal Grey Metallic
325k kms and counting
LLY Head swap
LBZ full intake w/MP
Flo-Pro Downpipe
4" Straight pipe
EGR delete
PCV Re-route
EFI Live (E. Stock/30HP/60HP Tow/high idle/No start)
Edge CTS2 with EGT
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