Good Sam Club Open Roads Forum: Tow Vehicles: SRW vs DRW
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Mike134

Elgin, IL

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Posted: 05/15/21 04:04pm Link  |  Quote  |  Print  |  Notify Moderator

Flashman wrote:

Mike134 wrote:

fj12ryder wrote:

If you have more contact surface, you'll have more friction/braking. That's why race cars have very wide tires: bigger tires=better grip.


Yep!! I can tell you paid attention in your HS physics class.


Consider a train - very small contact surface and pulling more than any RV. It is psi on the contact patch - the larger the patch the less PSI if the weight is the same.


It's not the PSI, it's the coefficient of friction between the 2 steel surfaces. "static" friction" vs "sliding friction" The Steam engine is an example what happens when the weight remains the same but you loss your static friction and now have sliding friction. ABS brakes another example.


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fj12ryder

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Posted: 05/15/21 06:03pm Link  |  Quote  |  Print  |  Notify Moderator

Yes, if you have too much contact area you can lessen the braking ability. But that ain't gonna happen by adding a second and third tire at the rear while towing.


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Travlingman

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Posted: 05/15/21 07:13pm Link  |  Quote  |  Print  |  Notify Moderator

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


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Geo*Boy

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Posted: 05/15/21 07:16pm Link  |  Quote  |  Print  |  Notify Moderator

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

Imagine that.[emoticon]

fj12ryder

Platte City, MO

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Posted: 05/15/21 08:29pm Link  |  Quote  |  Print  |  Notify Moderator

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.

Grit dog

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Posted: 05/15/21 08:42pm Link  |  Quote  |  Print  |  Notify Moderator

^That is interesting. I reckon I stand corrected!


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Mike134

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Posted: 05/15/21 08:44pm Link  |  Quote  |  Print  |  Notify Moderator

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.

Devo the dog

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Posted: 05/16/21 06:44am Link  |  Quote  |  Print  |  Notify Moderator

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.


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Mike134

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Posted: 05/16/21 06:49am 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.


Just 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.

rhagfo

Portland, OR

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Posted: 05/16/21 07:11am 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.


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.


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