Quote:
Originally Posted by cabrito
i am in vegas and drive to cali often and i agree, this isn't right. this is my 3rd large truck, all 4x4 with the last 2 being superduty's. granted, there are some roads where i had this same problem on the other trucks but this is way too much.
it almost feels like the frame from the cab back is flimsy and the whole thing flexes like a diving board. i also agree that once it gets started, it is very rhythmic. while i haven't made anyone sick, it is rather embarassing when my passengers look at me this shock and a "what the hell is wrong with your truck!!!"
i too have also noticed that with any significant load (either the harley at 550 or the dirt bike at 300) it goes away completely.
i talked to a guy down the street that owns a spring shop and he's not really sure what to think. while he agrees that it is either sprung too stiff or over shocked, he also thinks that the un-boxed frame is a significant factor.
the rhythmic aspect of it makes him lean toward the spring side he has suggested a softer spring and stiffer shock. since i won't be putting anything near the load capacity in the truck anymore (need it more for the room), i might give this a try.
he is an offroad racer and he also suggested maybe just going to a custom valved shock (king shock) that is set up specifically to this problem (dampens short, quick movments harder and sooner, then softer on longer sweeping strokes). this seems like a viable option too, althought i don't know how much cheaper than the first suggestion.
whatever the case, there is a problem.
|
Just got done driving around in a buddies Dodge 2500 Cummins.....much stiffer and bouncy than my Crew Max. Being in the area, you know the 2 worst areas are the 215 before it hooks up to the 95 on the South side and going south on the 95 after the spaghetti bowl.......
I told him about these threads and he basically LHAO.
I also currently own an '01 Crew Super Duty....just as, if not more, bouncy when empty.
One more example: My neighbor owns a roll off dumpster business. Being that I only work a few days a week, he asks if I can run bins for him.
When empty, the 6500 series GMC (ex-Penske truck) beats the living crap out of me with the exact same hobby horse motion (even with the extremely long wheelbase) with as little as a 10 yard bin on it, the ride smooths out considerably.......nothing "wrong" with the truck, no flexing frame, just a very stiffly sprung TRUCK!!!
I ASSURE you none of these trucks have flexy frames......including the Tundra.
It is very simply oversprung/over damped, the very fact that a few hundred pounds cures it is proof.
Being "rhythmic" is based on the distance of the expansion joints.....I've been able to speed up on the 215 to completely eliminate the bounce; unfortunately, those speeds aren't beneficial to keeping my license.
Look, I don't mean to be demeaning, and if if you want to meet somewhere and have a soda and talk about it, I'd gladly like to meet, I'll even bring the F-250 and we can go on back to back drives.