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01-09-2009, 09:13 PM | #1 |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Need torque twist help...pics included...
So I've got this super I built, and ever since its been able to move under its own power I've been trying to tune out the torque twist. Short links, long links, mounted low, mounted high, seperated and closer together, I've tried it all with various results. I'm posting some pics in hopes that someone will be able to point me in the right direction. The only way its been cured was to run it full droop, which is fine, except that I really need some belly clearance to get around most of the terrain around here. Too many sharp pointy rocks to have a belly scraper. Front shocks are currently running 1/2 droop (springs inside and out), rears are full sprung, lots of preload on the rt rear. Shock oil is 40wt with a touch of 10k diff fluid. Springs are of unknown origin, but are the stiffest I have. I've seen and downloaded the 4 link calculator, but was unable to get it to work right. On to the pics... |
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01-09-2009, 09:32 PM | #2 |
Quarry Creeper Join Date: Aug 2005 Location: Northern Va
Posts: 244
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mount your shocks to the axles. but you would need longer shocks or modify the chassis.
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01-09-2009, 09:36 PM | #3 | |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Quote:
I've thought about whipping up some extensions so that the shocks will reach, still might... | |
01-09-2009, 09:41 PM | #4 |
RCC Addict Join Date: Oct 2008 Location: Alpine,CA
Posts: 1,258
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Im no expert but from what ive seen people say countless times is "Double Triangulation" which is suppose to be the cure all... But like i said thats what ive read, i still have torque twist and i am not double triangulated. Just a thought i'd share |
01-09-2009, 09:45 PM | #5 |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Links are double triangulated. Not to a great degree, but they are.
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01-09-2009, 10:14 PM | #6 |
Quarry Creeper Join Date: Feb 2008 Location: New Rochelle
Posts: 363
| motor?
How many turns is your motor? depending on how thoses axles work the way that the drive shaft spins in the rear will lift one side. Adjusting both sides will through off how you rig works. you should just be able to put a stronger spring on the side that lifts of the ground. i dont know why you having such a big problem. you are doing to much work for such a simple problem.
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01-09-2009, 10:24 PM | #7 | |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Quote:
Chassis twists to the right. If you notice in the pic above the right rear spring is preloaded nearly as much as the shock travel will allow. All others are adjusted to give the needed ride height. | |
01-09-2009, 10:30 PM | #8 |
Quarry Creeper Join Date: Feb 2008 Location: New Rochelle
Posts: 363
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if the chassis twists to the right then you when the harder spring on the left. unless you are trying to say they right side lifts up means its twists to the left? you want to put the harder shock on that side. I also agree it would help if the shocks are mounted to the axles. Time for a new chassis that could help big time too
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01-09-2009, 10:50 PM | #9 | |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Quote:
Going to extend the shocks tonight or tommorow a.m. Chassis is only a couple of weeks old. Other than not letting the shocks reach the axles, whats wrong with it? | |
01-09-2009, 11:50 PM | #10 |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
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Just for giggles I skipped the shock extensions and mounted the shocks to the axle. Lost nearly 2" of ground clearance and had to find a new temporary place to mount the battery, but we're just testing anyway, right? So it seems to have helped a bit, but it still cranks over to the right. Not sure if the improvement is from the shock placement or my new super-low COG. What I did notice was that it wasn't as bad if I tried the same climb backwards. Maybe I have too much weight in the front... Tomorrow I'll swap the wheels around and see what happens, then go to town and find a tap that'll jive with the shock shafts. |
01-10-2009, 01:05 AM | #11 |
Rock Crawler Join Date: Sep 2004 Location: South Orange County
Posts: 589
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upper links parrell to the ground and and if it not maybe even a little higher on the axle end. also check out this thread sort through it and read it. Anti Squat and Suspension Tech |
01-10-2009, 01:33 AM | #12 |
Keep it real Join Date: Jun 2006 Location: Yakima,WA
Posts: 6,532
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You need to mount the shocks on the axles, but lengthen the chassis to keep them at the same angle. Also, raise the upper link mounts on the axles, to get more separation between the lowers and uppers, and then drill new holes in the chassis to lower your upper links more, to get less separation between your uppers and lowers and also bring the holes farther forward, closer to the lower link holes. 100wt oil in your right rear shock. That should get you in the ballpark.
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01-10-2009, 06:57 AM | #13 |
Rock Stacker Join Date: May 2008 Location: lake mary
Posts: 50
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with a shafty you'll always have torq. twist i found that bent links rolled and added twist by not transfering the torq to the axle |
01-10-2009, 08:08 AM | #14 |
Rock Crawler Join Date: May 2007 Location: Salt Lake City
Posts: 977
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Make the rear stiff and the front really soft on the suspention. Yeah that should work.
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01-10-2009, 08:11 AM | #15 |
I wanna be Dave Join Date: Nov 2006 Location: spring hill TN
Posts: 2,959
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01-10-2009, 10:13 AM | #16 | |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
| Quote:
Like so? | |
01-10-2009, 10:35 AM | #17 | |
TEAM MODERATOR Join Date: May 2004 Location: Tennessee
Posts: 10,855
| Quote:
That should be better. Try to raise your upper axle mount a touch. For better triangulation,move the uppers inside on the axle end. Then,notch out your skid and move the lowers to the middle of the skid. | |
01-10-2009, 11:04 AM | #18 |
Keep it real Join Date: Jun 2006 Location: Yakima,WA
Posts: 6,532
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01-10-2009, 01:18 PM | #19 | |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
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Cool. Thanks guys, this is exactly the info I was looking for. To move the uppers higher I'm going to need to build a mount for them, they're about as high as they will get at the moment. Hopefully I'll have some progress pics by this evening. btw: I know this thread is focused on the rear of the truck, but I haven't seen any comments on the way the front links are placed, so should I assume they are in a reasonably good position? Quote: Last edited by Duuuuuuuude; 01-10-2009 at 01:28 PM. | |
01-10-2009, 02:14 PM | #20 |
Rock Stacker Join Date: Sep 2008 Location: Folsom
Posts: 98
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Try making the lower driver side link a touch longer then the passenger side. work in my case. |
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