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Old 05-16-2018, 03:56 PM   #1
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CAT scale results

I am perplexed by my recent trip to the DMV scale. The three passes I made are detailed in the attachments and to my uneducated self it appears that my WDH is not transferring much load even though the wheel wells are only 1/2 inch higher in the front than the back. I'll appreciate any constructive comments.

TV - 2016 Ram 1500 5.7Hemi, 4WD, tow package, Sumo springs
RV - 2007 28' International CCD
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Old 05-16-2018, 04:17 PM   #2
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Hi

Variable rate spring setups have been the "big thing" on pickup trucks for a while now. That makes judging things by eye a bit difficult. Scales are the only way to work out what this or that setting really is doing. Actually driving the rig is the only way to tell which settings work best.

Bob
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Old 05-16-2018, 04:20 PM   #3
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When you say the measurement to the front is close to that in the back, it sounds like you are comparing front axle height to rear axle height. What you want to compare is the front axle (unloaded) to the front axle (loaded) to the front axle (loaded but with WD)

The scale numbers show that you aren't transferring much weight.
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Old 05-16-2018, 04:34 PM   #4
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I measured from the ground to top of wheel well to get the half inch difference.
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Old 05-16-2018, 04:37 PM   #5
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Hi

Variable rate spring setups have been the "big thing" on pickup trucks for a while now. That makes judging things by eye a bit difficult. Scales are the only way to work out what this or that setting really is doing. Actually driving the rig is the only way to tell which settings work best.

Bob


Bob, The rig drives and tows very well. No sway and the steering does not feel light. My concern is the similarity of axle weights with and without the WDH.
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Old 05-16-2018, 04:44 PM   #6
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I measured from the ground to top of wheel well to get the half inch difference.
Yes, but a half inch difference between the front axle and the rear axle?

Forget the rear axle for now. Just measure the front axle; unhitched, hitched with no WD, and hitched with WD. Those are the numbers to compare. They likely show that you aren't transferring much weight back to the front axle, which is what the scale results have shown you directly.
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Old 05-16-2018, 04:50 PM   #7
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Is there a rule of thumb as how much weight should transfer to the front axle, and to the trailer? I may have just failed to add sufficient tension to the chains.
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Old 05-16-2018, 04:53 PM   #8
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Do you have your axle weight ratings (GAWR) from the door sticker? Likely 3900 lbs for the rear axle?
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Old 05-16-2018, 05:56 PM   #9
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Is there a rule of thumb as how much weight should transfer to the front axle, and to the trailer? I may have just failed to add sufficient tension to the chains.


Rule of thumb is 100% FALR (front axle load restoration). If you take 400# off the front axle, you should dial in the WD to put 400# back on the front axle. Check your manual though - some tow vehicles look for 50% FALR depending on a lot of factors.
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Old 05-16-2018, 06:06 PM   #10
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Rule of thumb is 100% FALR (front axle load restoration). If you take 400# off the front axle, you should dial in the WD to put 400# back on the front axle. Check your manual though - some tow vehicles look for 50% FALR depending on a lot of factors.
...and some manufacturers state the 50% of front wheel well height restoration is the target. Does that happen at 50% weight restoration? Probably close, but not necessarily.
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Old 05-18-2018, 05:36 AM   #11
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50% will do a lousy job.

FALR is the beginning. Test drives from here are the thing. This much distribution, or more. Or, less.
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Old 05-18-2018, 12:09 PM   #12
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In any case, you tune by the numbers, test drive it, and adjust from there. I suspect some drivers just can’t feel a ‘floaty’ steer axle. To me, it’s real obvious the front end of my Tacoma is too light. It feels unstable, and porpoises a lot. Then it’s time to crank in more WD tension until this feels ‘planted’ properly on the road.
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