WDH Setup - Ford Guidelines
#1
Roast. Grind. Brew. Enjoy
Thread Starter
WDH Setup - Ford Guidelines
I was just reading the weight distribution hitch setup section in the 2017 towing guide. Ford's recommendation for the F150 is a 25% "weight distribution correction factor". In their example, if your front fender height change without the weight distribution bars is 1", then you should setup your hitch to reduce that amount by only 0.25 inches. I was surprised, it's the first time I've seen a recommendation like this. The instructions for my Equalizer hitch say to aim for 50% to 100% correction, with 100% being ideal, which seems to be the most common recommendation when researching online.
#2
Since the SAE towing standard has been followed the amount of WD used has been lowered by pretty much all manufactures. I believe the f150 is the only vehicle that the manufacturer recommends only 25% most are 50%. The reason is because adding WD decreases understeer and in most cases restoring to 100% is too much.
#3
I call BS big time on that. I followed the OM to the letter and had sway when set to that fender height. When I returned it to nearly empty setting, sway was gone. Right now my BO has it 100% returned and it handled better than it did with the Husky hitch. It may have a lot to do with the type of hitch used too. I will know more later this year after I have some miles on the new hitch. With all the issues I had with the way the truck handled without a trailer and with, and hopefully now corrected, I will have to drive it again to find out for sure. For all I know at this point, with the EPAS being recalibrated, it may very well only need a small amount of weight moved forward. The EPAS calibration was done after my trailer was stored.
#5
Member
Join Date: Jan 2018
Location: Memphis, TN, Earth, Milky Way
Posts: 11,256
Received 1,731 Likes
on
1,487 Posts
If there's ANY tongue weight (and we know there SHOULD be), then that weight will compress the truck's suspension. It has to. So having EITHER end at UNloaded ride height is wrong.
If you remove ALL that compression from the rear with a WDH, then it ALL has to go to the front (PLUS the weight of the WDH). That's too much on the front, and not enough on the rear. The goal of a WDH is to DISTRIBUTE the tongue weight across both truck axles - not to remove it from either.
If you remove ALL that compression from the rear with a WDH, then it ALL has to go to the front (PLUS the weight of the WDH). That's too much on the front, and not enough on the rear. The goal of a WDH is to DISTRIBUTE the tongue weight across both truck axles - not to remove it from either.
#6
Roast. Grind. Brew. Enjoy
Thread Starter
I'm a read-the-freakin-manual kind of guy, I try to trust that the manufacturers know their own product, and follow their recommendations. So when the truck manufacturer and the hitch manufacturer are not in agreement, I find that irritating. But I guess the correct answer is to pick one way or the other, set it up that way, see how it handles, then adjust it from there. The point where it handles the best is the "right way".
#7
I'm a read-the-freakin-manual kind of guy, I try to trust that the manufacturers know their own product, and follow their recommendations. So when the truck manufacturer and the hitch manufacturer are not in agreement, I find that irritating. But I guess the correct answer is to pick one way or the other, set it up that way, see how it handles, then adjust it from there. The point where it handles the best is the "right way".
Trending Topics
#8
Using less WD is a result of SAE testing that shows adding any amount WD reduces the (UG)understeer gradient. The UG test that’s in the j2807 towing standard uses a constant radius test completely independent of the sway damping test. We’ve covered this in other posts but the ideal scenario is to use the minimum tongue load for a trailer that keeps sway at bay so the amount of WD used in minimized. You should always follow the vehicle manufactures recommendations since they are the ones that test the vehicle, hitch manufactures can only give a general recommendation.
#9
I read the Ford manual. When I set up my Blue Ox I did it the way Ford recommends and didn't like the way the truck handled. I then put enough spring bar tension to return the front fender height to it's unhitched height and liked that the best.
#10
See^^ I'm not the only one.