Good Sam Club Open Roads Forum: Tow Vehicles: SRW vs DRW
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 > SRW vs DRW

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fj12ryder

Platte City, MO

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Posted: 05/16/21 07:28am Link  |  Quote  |  Print  |  Notify Moderator

Mike134 wrote:

fj12ryder wrote:

What would be really interesting is if they did them pulling a trailer or 5th wheel. Same trailer, same test and see what the results were. That would be actually useful.


If the dually stops faster, I'd expect the same result pulling a trailer. Just have to make sure all test trucks send the same strength brake signal to the trailer.
Yeah, I figured that, but I was curious what the difference in stopping distances would be compared to an empty truck.


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Lantley

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Posted: 05/16/21 07:29am Link  |  Quote  |  Print  |  Notify Moderator

Devo the dog wrote:

Travlingman wrote:

Here is a challenge that Pickuptrucks.com ran on 2018 1 ton SRW and then 2017 1 ton DRW where they did a braking challenge from 60 MPH to 0.

1 ton SRW:
Chevy - 165.3 feet
Ford - 158.3 feet

1 ton DRW:
GMC - 133.39 feet
Ford - 139.68 feet

The DRW test was done on a drag strip (Las Vegas motor speedway).
The SRW test was done on a dusty airport runway in Kingman AZ.

Those are two completely different surfaces. LOL.

I really don't think those conditions are that much different as to invalidate the results. Dually has more braking ability.
It's not like one was in the rain vs. a sunny day.
If really in doubt conduct your own test. With your own trailer.
I have towed same trailer with dually and SRW.
Spoiler alert: The dually will stop faster.
I never knew or considered the DRW and SRW have same braking components. I simply recognized from the driver seat the dually stops quicker than the srw


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Mike134

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Posted: 05/16/21 07:45am Link  |  Quote  |  Print  |  Notify Moderator

Lantley wrote:

Devo the dog wrote:

Travlingman wrote:

Here is a challenge that Pickuptrucks.com ran on 2018 1 ton SRW and then 2017 1 ton DRW where they did a braking challenge from 60 MPH to 0.

1 ton SRW:
Chevy - 165.3 feet
Ford - 158.3 feet

1 ton DRW:
GMC - 133.39 feet
Ford - 139.68 feet

The DRW test was done on a drag strip (Las Vegas motor speedway).
The SRW test was done on a dusty airport runway in Kingman AZ.

Those are two completely different surfaces. LOL.

I really don't think those conditions are that much different as to invalidate the results.


You've never raced on a dragstrip have you? The guys running for money will even select which lane is the stickiest to run on.
In addition airport runway friction levels will vary and the FAA requires it to be checked.
https://www.faa.gov/airports/resources/advisory_circulars/media/150-5320-12C/150_5320_12c_chg1.pdf

* This post was edited 05/16/21 08:20am by Mike134 *


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brandon

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Posted: 05/16/21 09:01am Link  |  Quote  |  Print  |  Notify Moderator

For me right now.... i am simply used to allowing my manual down shifting and exhaust brake to take care of a large percentage of braking for me, luckily the banks exhaust brake i have on this 5.9 is a monster when your able to downshift yourself. However the one that was on my 6.7 dually was quite effective as well. All in all the braking while important should be miniscule between the two vehicles, i would still vote for dually having more breaking ability. The used truck market is not in a purchasers favor at the moment thought that is for certain!


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fj12ryder

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Posted: 05/16/21 10:52am Link  |  Quote  |  Print  |  Notify Moderator

All things being equal, i.e. tire sizes, on the trucks. A DRW will have a roughly 50% larger overall contact patch compared to a SRW. But the weight difference will be roughly 30% less per contact patch. To me that would indicate the DRW would stop quicker, all things being equal.

Common sense would seem to indicate the DRW would stop quicker, but when it comes to physics, common sense sometimes isn't so common. [emoticon] But I still think the DRW will stop in a shorter distance.

Cummins12V98

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Posted: 05/16/21 11:04am Link  |  Quote  |  Print  |  Notify Moderator

"It would be nice if they could get the vehicles for their test at the same time so the test would be in the same conditions."


I agree, I would also like them to fill to the top not the silly click method.


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Grit dog

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Posted: 05/16/21 11:27am Link  |  Quote  |  Print  |  Notify Moderator

Devo the dog wrote:

Travlingman wrote:

Here is a challenge that Pickuptrucks.com ran on 2018 1 ton SRW and then 2017 1 ton DRW where they did a braking challenge from 60 MPH to 0.

1 ton SRW:
Chevy - 165.3 feet
Ford - 158.3 feet

1 ton DRW:
GMC - 133.39 feet
Ford - 139.68 feet

The DRW test was done on a drag strip (Las Vegas motor speedway).
The SRW test was done on a dusty airport runway in Kingman AZ.

Those are two completely different surfaces. LOL.


Aww snap! So maybe I’m not all sideways on this...
Thx for sharing Devo.


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Sagebrush

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Posted: 05/16/21 11:30am Link  |  Quote  |  Print  |  Notify Moderator

Your also not pushing the rear tire's load ratings of a DRW like a SRW. Even with a 4k or 5K pin weight. Using the tire load charts or even the truck's door sticker for max payload I've never needed to air up my DRW to the tire's 80 psi max. My max payload rating needs 65 psi in the tires. Its nice to have those rear tires well within their load capacity.

philh

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Posted: 05/16/21 11:33am Link  |  Quote  |  Print  |  Notify Moderator

{sigh}

This is not a simple friction equation. In general, given the same weight, frictional forces do not change with contact area.

Turn off traction control and I can guarantee the brakes will lock up the wheels, no matter if it's DRW or SRW

Where it really gets complicated, unloaded DRW, vertical load on contact area is less than SRW. Loaded, the weight increase means DRW will stop faster... but even that gets confused with trailer brakes entering the picture. I most certainly wouldn't to do a panic brake stop without trailer brakes, jack knife comes to mind.

This is best seen on snowy surfaces, wider tires have lighter vertical load and subsequently less traction.

Bottom line, while towing, DRW has the capacity to stop in a shorter distance on dry roads. While not towing, SRW might stop faster.

Devo the dog

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Posted: 05/16/21 12:40pm Link  |  Quote  |  Print  |  Notify Moderator

Mike134 wrote:

It goes to show how worthless internet info can be unless you drill down and verify. Sorta like the "facts" you hear boasted at the local gin mill after the patrons have had a few to many.

I know what you mean. But, internet info isn't the problem. It's the lack of comprehension and basic reading skills.


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