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Up travel vs. Down travel....

sirhk100

Well-Known Member
I've heard so many arguements about what's good and what's bad for setting ride height in the abailable travel. I'm happy with how mine perfoms and won't be making many changes but just for my personal knowledge and curiosity, what's the best setup? 50/50? More up then down? More down then up? Does it depend on what you're doing? Jumping vs fireroads (Ocotillo style) vs whoops (Barstow) vs whatever? I'm asking these questions based of various conflicting stories I've heard so far.....

Khris

'92 Ford Exploder (work in progress)
 

cleartoy

Well-Known Member
It depends on what you are doing. With desert, i like more extension travel than compression. When jumping, you want more compression travel than extension, or you will bend your bumpstops like i did off devils slide!~

85 Toyota xtracab 4x4(for sale)
94 Toyota stdcab 2x4
99 Yamaha YZ250

Got Sand??
 

1992f150

Well-Known Member
if your completely in the air, the suspension will be fully drooped, so would it even matter with jumping?

Azusa: shame of the foothills
 

cleartoy

Well-Known Member
Yeah, your spring rate will be to soft and you will bottom out hard when you land.

85 Toyota xtracab 4x4(for sale)
94 Toyota stdcab 2x4
99 Yamaha YZ250

Got Sand??
 

Junior

Well-Known Member
This is a good thread for Kreg, but I will venture a guess and suggest that up travel is your friend.



Junior
EJR Racing Trophy Truck #44
<A target="_blank" HREF=http://www.ejrracing.com>http://www.ejrracing.com</A>
 

Gabe Lara

Well-Known Member
With more bump or "up" travel, the ride height is considerably lower, and your CG is as well... your handling will be alot better at high speeds. Look at alot of the TT's out there and how low the CG is. This is pretty much the norm for a full 4-linked truck.

The thing is that in order to get the lower CG, you'd have to do a bit of frame rail modification. ( pie and or notching the rails) out of a stock or street truck.

-Gabe
 

michael

Well-Known Member
OK Gabe......I'm confused now. I would think just the opposite is true. To get more "up" travel the truck would have to be raised thus reducing down travel....right?
I wanted more droop or "down" travel on my Chevy so I lowered the whole truck. Am I missing something??

Michael <A target="_blank" HREF=http://mkparker.com/goose>mkparker.com/goose</A>
 

Gabe Lara

Well-Known Member
Uno Mas...
And she sits about 1/2 inch higher than stock, on 35's with 27 inches of travel in the rear.
(About 19 up front... for now)
 

Attachments

TDORSloppy

Well-Known Member
Yeah, I'm lost too. With more down travel you will have a lowered ride height. Gabe, what is that first picture showing?
 

michael

Well-Known Member
Nice Ranger! It looks like most of that travel will be in the droop direction. So.... on any given vehicle the more droop, the lower the vehicle will sit and the more compression, the higher it will sit....right? Then it appears that the general trend (in answer to the original question) is more droop is better....?
Thanks!

Michael <A target="_blank" HREF=http://mkparker.com/goose>mkparker.com/goose</A>
 

Dylan

Well-Known Member
with more droop travel it becomes more difficult to get the right spring rate
40% droop
60% compression
 

Junior

Well-Known Member
Nice truck Gabe. Isn't it about time that you lose interest in it and sell it to me for cheap?



Junior
EJR Racing Trophy Truck #44
<A target="_blank" HREF=http://www.ejrracing.com>http://www.ejrracing.com</A>
 

SpareChangeRacng

Well-Known Member
I'm not exactly sure if it is a pie cut or not, but SI and Newline cut the rear portion of the frame off about 6-12" before where the stock raise in the frame is (over the rear axle), and then angle/arc the frame up 6" or so. They then tie this portion of the rear frame back into the stock frame and the roll cage. All in all it is VERY stout, and allows for the axle to swing up much higher then if the frame was left stock. I'll see if I've got any good pictures of this lying around. Steve
 

John Bitting

Administrator
Yes Steve, Newline pie cut Gabes frame, One to kick the frame up and another to lay it back out flat. Then they cut the frame off just after the axle and made a tubular fuel cell cage. The frame gets kicked about 7-8 inches to allow 27" of travel.
 

Greg

Well-Known Member
This a loaded question. Up travel vs. down is relative to how you set your truck-up and what your limitations (body, fenders, tire size, ect.). Something to look at is the fact that "ride height" is not the same as "running height". Look at any TT through the whoops, the mean height is much "taller" than sitting height. Therefore to set up an up vs down # is very difficult. I used to think that more "up" travel was needed for jumping or hitting big whoops, I was wrong. Rebound is the key. As you hit whoops the truck wants to keep going straight and as long as the wheels drop into the hole fast enough the other side of the hole will be absorbed by the full copmression stroke. As for srping rate, you will find on anything faster than a long roller, spring rate doesnt do much. One problem with lowering your ride height is that you need either a shorter spring or less spring rate and that goes against slow speed handleing and hurts extension speed.

Greg
 
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