what causes bounce

Kman9090 said:
So DISTURBED how many times did you watch the video of the sled polvolting your truck before you figured out waht the problem was??? LOL LOL Sorry! But that was by far the coolest picture i had ever seen!
Click to expand...

:kick:
Thanks,
A couple we originally thought that the front broke and locked the truck up but that wasnt the "CASE":hehe:
 
DISTURBED said:
Well we ran 22 inch hitch height, but a flat tire cant bounce. I would go down before going up with pressure. Its your call you know your truck better then i do but i have never had good runs on high tire pressure. i would start at 40psi and see if it still bounces.
Click to expand...
Good point. I never thought of it like that.
mech2161 said:
Drop your hitch back down.
Click to expand...
I'll definately do that.
BigB82789 said:
Hang weights.
Click to expand...
I already built my hitch, just trying to find weights.
DISTURBED said:
Thats a good idea especially with no weight on the nose
Click to expand...

I agree.
 
I dont buy the theory that we evolved from monkeys either, but what are you goin to do? LOL
 
smokeisfun said:
are 2wd more prone to bouncing...also i put all the weight at the very back of the box it was around 1000lbs
Click to expand...

i had the front of mine bouncing once (nose).. felt like a washboard effect goign form soft to hard pack dirt..

that was before i blocked solid and had a 30" hitch.

but i am at tottal of 5 hooks and no video yet of my truck
 
cummins724 said:
Why not? It makes sense if you think of a basketball.
Click to expand...

Just watched the video in your sig. Im willing to bet you are within 5 psi of getting rid of the bounce at 25 3/4 hitch hieght, just my thoughts though
 
Last edited:
My bet is dropping tire pressure doesn't stop it. Jamie try the hitch at 24.
 
mech2161 said:
My bet is dropping tire pressure doesn't stop it. Jamie try the hitch at 24.
Click to expand...

Maybe, thats why its called trouble shooting. Take everybodies input and make an educated guess till its fixed. Going back to what you know works, then start tweaking till its on kill or starts bouncing again then you know you went to far and need to back up your setup.
 
i must have a fluke truck then, run the rears at 60psi and in 40+ hooks I have only ever bounced once.

i love watching the guys with no air in the rear tires hop down the track like a bunny wrinkling the tires and floating up and down until they get to the very end and its hop hop BANG.

the basketball theory doesnt work here, we arent taking our tires and dropping them from 3 feet and trying to stop them from bouncing back up. there is a great force holding them down and the better your tires can support the force without squatting and flexing the better off you will be.

i think jamies hop in that video is spring related, the truck was hopping befor ethe tires ever moved, it was the suspension loading and unloading...that inch of travel with heavy springs needs to come out very smooth to keep the load constant and the stops setting solid. when you come out hard and the force is not constant it unloads the spring tension and sets it into a rhythm. the one time i bounced badly to where i had to eventualy let out and give up...i came out way too hard, blew the tires off and the suspension kept unloading on me until it got in a rhythm i couldnt get to stop.

thats my $.02.
 
I never had a hopping issue before adjusting my hitch up before the Cumberland pull. I'm gonna start with that first & go from there. If that doesn't work, then I'll play with tire psi.
 
An under inflated tire will have less traction. The center of the tire rolls in, less contact patch.
 
mech2161 said:
An under inflated tire will have less traction. The center of the tire rolls in, less contact patch.
Click to expand...

true to a point..

overinflation will do the same thing by pullign the outside fo the tie up.
 
I have always ran 65 psi in the back.. You could maybe even try clamping your springs.. just a thought..
 
With 1000lbs in the back you still have 1" travel?

I run 50-60psi in the back and have never bounced... mines 4wd though... I run between 20-30psi up front...

Sounds to me like maybe the rear end is compressing and unloading causing bounce... just my .02 though... a lot of guys on here know way more than me! ;-)
 
getblown5.9 said:
i think jamies hop in that video is spring related, the truck was hopping befor ethe tires ever moved, it was the suspension loading and unloading...that inch of travel with heavy springs needs to come out very smooth to keep the load constant and the stops setting solid. when you come out hard and the force is not constant it unloads the spring tension and sets it into a rhythm. the one time i bounced badly to where i had to eventualy let out and give up...i came out way too hard, blew the tires off and the suspension kept unloading on me until it got in a rhythm i couldnt get to stop.

thats my $.02.
Click to expand...

thats where my hop came from last pull, i put bumpstops on for the frist time, and i hopped all the way done track, i figured i came out to hard and just started a chain reaction.
 
also for the sake of argument, i have run my fronts as low as 16psi (they looked nearly flat) and spun them at 35+ mph and it was enough force to make them stand up like a drag slick does, and in the pics you cant even tell they were aired down.
 
My buddy gave me weights today. He had [8] 100# weights sitting in the weeds by his garage. The dummy was gonna haul them in for scrap before I saw them.
 
cummins724 said:
My buddy gave me weights today. He had [8] 100# weights sitting in the weeds by his garage. The dummy was gonna haul them in for scrap before I saw them.
Click to expand...

Must be nice!! What brand?? Ill buy two off you.
 
You must log in or register to reply here.
Top