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Downforce on the hitch

D

Dodgeit

Member
How would a person go about determining the amount of down force on the hitch in a given weight class, when the only variable is the speed in which the weight box climbs the sled?

Or how do you arrive at the amount of weight on the front of the tractor? I know there are some precentages that people use. My puller is balanced
( front just floating ) until I hit the 8500 lb class and then with the weight all the way forward the front comes way up, at the half way point the front is off the ground high enough that I cannot control direction unless using the brakes.
 
that's what keeps pullers going to pulls , see if
they can out guess the others . if they can 1st
place is theirs .
 
Hmm... So many variables, so few answers. Its all a
combination of hook length, track conditions,
tractor setup, and the kitchen sink. I always run
my first class the same, since I have very little
movable weight at that point. The second class, I
take a guess based on the first. I think if every
track and every hook were the same I would get bored
really quick.
 
(quoted from post at 10:40:13 07/06/12) Maybe drawbar adjustments are in order.....
Click to expand...

I'm already as close to the axel and as high as the rules allow. I also have already figured out how many pounds of weight needed to counter 1000 pounds of down force on the hitch, was just wondering if anybody cared to hazard a guessitamate.
 
I already had assumed your drawbar was as high and as close to the axle as possible, as that seems to everyones starting point. Iffin it were me I might "waste" a hook or two with a lower drawbar in 8500 , just to see the results. But what do I know? What other varibles do you have to work with?
 
(quoted from post at 20:32:58 07/07/12)
What ever weight I need to add for each class.
Click to expand...

You need to put some of the added weight on the front. It is out there at the end of the pull that you need the most down force and you can't get it with the front in the air.
 
(quoted from post at 09:46:02 07/08/12) I already had assumed your drawbar was as high and as close to the axle as possible, as that seems to everyones starting point. Iffin it were me I might "waste" a hook or two with a lower drawbar in 8500 , just to see the results. But what do I know? What other varibles do you have to work with?
Click to expand...

Gary, thanks for the reply. I'm winning the 8500 classes I've pulled in so far. Yesterday, the track was wet and soft, pulled 4 classes and the front end never floated. On the dry hard track is when I have problems with front end coming up. I'm just trying to figure out how much weight to put up front, if I'm adding 1400 behind the axle, and 100 up front and the front is coming way up. I know I need more just trying to get a feel for how much more.

What other variables are you talking about. Tire pressure? Weight brackets? Gears? 1st through 3rd gears are below the 3.5 mph speed limit.
 
(quoted from post at 16:31:18 07/08/12)
(quoted from post at 20:32:58 07/07/12)
What ever weight I need to add for each class.
Click to expand...

You need to put some of the added weight on the front. It is out there at the end of the pull that you need the most down force and you can't get it with the front in the air.
Click to expand...

Thanks for the reply. I know I need more, it's how much more I need and not be overkill.
 
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