Reverse triangle 4 link?

Discussion in 'Suspension/Chassis' started by Lotoy, Jul 12, 2013.

  1. NashMan

    NashMan Toyotaholic

    Joined:
    Nov 11, 2012
    Messages:
    1,209
    Likes Received:
    16
    Location:
    Vancouver Island, Canada
    Truck:
    94 2wd
    why not just run a 3 link and call it a day
     
  2. 93_Toy_Mini

    93_Toy_Mini Addict

    Joined:
    Jan 5, 2012
    Messages:
    597
    Likes Received:
    2
    Location:
    Gardnerville, NV
    Truck:
    93 Reg Cab Pickup
    Nah, don't like how it looks. Looks like you were to lazy to measure the forth link so you just welded the center two together.
     
  3. Lotoy

    Lotoy Enthusiast

    Joined:
    Jun 7, 2013
    Messages:
    297
    Likes Received:
    6
    Location:
    knoxville tn
    Truck:
    92 std cab
    After driving my truck with the forward 4 link that is the way to go! I've put about 70 miles on it now and love the forward link set up!
     

    Attached Files:

  4. TRUCK ACTION

    TRUCK ACTION Grand Toyotaholic

    Joined:
    Jan 5, 2008
    Messages:
    4,188
    Likes Received:
    600
    Location:
    Vallejo,Ca.
    Truck:
    88 Extracab,2wd
    Every book on suspension states the facts, which are laws of physics, & can not be changed!!

    Reversed & 50/50 ( forward bars & backwards bars) are not the best why to go. It will work & you may never feel or experience the the ill effects of these set ups.

    My option is do it once & do it right!!:cool:
     
  5. Litneon

    Litneon Super Moderator Staff Member

    Joined:
    Mar 29, 2007
    Messages:
    2,414
    Likes Received:
    50
    Location:
    Cocoa, FL
    Truck:
    94 xtra cab
    I'm glad you are happy with the setup that you chose.

    Truck Action, could you please post some supporting evidence to the "facts"?

    What "ill" effects are there in a properly designed reverse 4 link?

    Sure I'm a bit defensive because I have that setup, but I've never seen anyone be able to support the drone of negatives about them with anything other than hear say. While a forward setup can be better for being able to be tuned, they can be setup even more dangerously than a reverse setup. (You can never accidentally induce over steer like a crappy forward setup.)

    I'm at somewhere around 200 hp to the wheels at this point and have suffered no "ill" effects. No wheel hop, no excessive squatting, no uncontrollable counter steer or over steer. To me it seems that it's a bunch of BS.

    Will a forward outperform a reverse setup? Yep, at the dragstrip. I don't go to dragstrips, so I'll never see the difference. They both work in the real world, they hold the axle laterally and allow it to travel up and down.
     
  6. TRUCK ACTION

    TRUCK ACTION Grand Toyotaholic

    Joined:
    Jan 5, 2008
    Messages:
    4,188
    Likes Received:
    600
    Location:
    Vallejo,Ca.
    Truck:
    88 Extracab,2wd
    If all you're looking for is simplicity of installation and you don't want a two-link, these systems are the ticket. We have all seen them at shows or on the road (you might even own one!), so we can't argue that they don't work. The best explanation that we've been able to come up with for these systems, is that they are counterproductive. The suspension's job is to take energy that is being transferred into the tires from the ground and to properly transmit those forces into the chassis to be used to create more traction. A reverse link system, in which the bars mount to the rear axle and the rear of the chassis behind it, does just the opposite, and the two-forward/two-reverse link system is nearly unpredictable in how it transfers energy from the ground to the chassis.
    Even if you calculate every single point to an exact placement when designing one of these systems for your truck, you will still only end up with a drivable truck and not one that handles properly. Your only hope for performance with a reverse triangulated four-link is to limit the travel as much as possible and run a stiff spring and a stiff shock. Then, maybe you'll have the traction of a poorly set-up forward-facing link system. The best way to think about it is to understand that with a properly designed forward-link system the rear end is actually being pushed against the ground by the chassis. So any force that the rear end can use to push against the chassis will ultimately create more traction. With a reverse-link system, if the rear end were to pull down on the chassis there would be an equal loss of traction. Try this on a bathroom scale. Stand on the scale in front of a cabinet and pull up on the cabinet and see that your weight goes up according to how much force you are able to apply to the cabinet. Now push down on the cabinet. Your weight will go down to nothing fairly easily. That is what's happening on a reverse-link system. The rotating force of the tires driving the truck forward applies an opposite twisting force into the rear end housing, and that force is applied to the chassis behind the rear end pulling the back of the chassis down, thus negating any hope for traction.
    On paper, this design looks great because the pinion can be kept well within working limits. A quite desirable instant center can be calculated, and it seems to fit into the confines of just about any truck. The real negative effects are all dynamic, meaning that they are only noticeable when the truck is being driven and the more dynamics being applied, the less traction it has.

    This is only one of many writings on this subject!
     
  7. Litneon

    Litneon Super Moderator Staff Member

    Joined:
    Mar 29, 2007
    Messages:
    2,414
    Likes Received:
    50
    Location:
    Cocoa, FL
    Truck:
    94 xtra cab
    You really should give credit if you didn't write this. So that the whole piece could be read....

    Was it a copy and paste?:cool:
     
  8. White Trash

    White Trash Toyotaholic

    Joined:
    Jan 26, 2011
    Messages:
    1,779
    Likes Received:
    95
    Location:
    Eastern WA
    Truck:
    89 auto cross beater

    You are the only one arguing that a reverse link is great. Galileo you are not sorry mang, generic physics say it's craptastic at best. :lol:

    Here's the source link for the copy paste above.
    Rear Axel & Suspension:Rear Link Supension. Types and Theroy. - MightyRam50.net
     
  9. Litneon

    Litneon Super Moderator Staff Member

    Joined:
    Mar 29, 2007
    Messages:
    2,414
    Likes Received:
    50
    Location:
    Cocoa, FL
    Truck:
    94 xtra cab
    Ok White Trash, I don't know if I have ever used the words "great" and "reverse 4 link" in the same sentence. I could be wrong, but I've always said that it is a compromise. It does what it is supposed to do. I've also never claimed to be Galileo, or a physicist. I do however, understand 4 link suspension design pretty well. I've been building both forward and reverse (one) suspensions for over 15 years now at my family's 4 wheel drive shop.

    You cited an article written by someone who doesn't know how to spell. Now, that doesn't mean that he doesn't know his stuff, but it counts for something. Even he states in the final paragraph....

    "Finally, before settling on a suspension design, be honest about what you need your truck to do, not what you want it to do or how you want it to look. We all want our trucks to be the very best, but the actual use of your truck should be considered in your suspension design. If you want a truck that can put 1,000 hp to the ground using a limited-travel suspension design and still be able to drive it to work every day, you're going to suffer with an ill-driving truck in most situations. The same goes for a daily driver that has too much suspension travel-it just won't drive very well that way."

    I'd have to revisit you guys' build pages, but unless you have v8 or turbo inline 6 power you will never overpower a reverse setup that is properly designed.

    The thing that bothers me most is the crap that I see like this.

    WTF? I own a few books on suspension design. None of them cover reverse 4 links. I have never seen or read a book or talked to anyone who has actually thought out the effects of the reverse setup that could explain exactly why it it such a bad idea for anyone to use it.

    How do you determine what "the best way to go" is for me? Or anyone else for that matter? Are you driving their truck? Are you performing their work, or paying for their parts? But, in the same sentence, "It will work..." Huh? If it's such a bad design, how can this be? Even though "it will work", "you may never feel or experience the ill effects"? If I never feel or experience them, then for all intents and purposes, they don't exist in my circumstances.

    Your "option is do it once & do it right!!". First off, why are you yelling at me? Secondly I did mine once and love it. Not out of stubbornness, but out of the fact that it does the job I need it to. Imagine that! I researched it, saw all the BS about how evil and terrible they were, modeled it, and yes, built it. Will I build another one? Maybe, but I have one, so why would I? Would I build a different setup? Sure, if it fits the circumstances of the next build.

    I don't have anything against you guys for not agreeing with me, but to label something and say that it won't work for me or the next guy? Come on, take a look at Obamacare, since when does anything work best for everyone?

    Anyway, that's my rant for the evening. ;)
     
    Last edited: Dec 3, 2013
  10. White Trash

    White Trash Toyotaholic

    Joined:
    Jan 26, 2011
    Messages:
    1,779
    Likes Received:
    95
    Location:
    Eastern WA
    Truck:
    89 auto cross beater
    I cited nothing. I linked to an article you asked about after taking 3 seconds to google a quotes source that you asked about.


    Take any xj, tj or jk and run it in front wheel drive only and stomp the gas. The tires go up in smoke easily even with the heavy engine over top of it simply due to the axle being forward of the links. It is just how things work, no amount of tuning will make it much better.

    The reverse 4 link is a compromise for the lazy. If you're too lazy to move the gas tank then you deserve to have limited traction. It isn't my fault it's just geometry. What you are willing to live with isn't what everyone else should be will to put up with too you are correct in that.
     
  11. Litneon

    Litneon Super Moderator Staff Member

    Joined:
    Mar 29, 2007
    Messages:
    2,414
    Likes Received:
    50
    Location:
    Cocoa, FL
    Truck:
    94 xtra cab
    Umm, this is a cite.

    I think it fits definition number 2..

    That is the worst description of the similarities in suspension geometry I've ever heard. In FWD only? From that, I can't take anything else you've said concerning the subject seriously. Maybe you should rethink it.... A front suspension on a Jeep has very little to do with a reverse 4 link on the rear of a vehicle.

    That is an insult. And a bit torpid. I'm LAZY? Who the heck are you? I've worked my a$$ off to keep this truck as clean looking as possible. By using this inferior design, I've managed to keep everything under the floor of the bed while looking mostly stock. Heck yes I "deserve" the design I chose. I freakin' chose, designed, and built it.
    I can't seem to get it though to you guys, I don't live with any of the "bad" problems you seem to think I do. If and when I do, I'm man enough to get on here and start a thread about how "wrong" and "lazy" I was.

    Your closed mindedness is extremely bothersome.
     
    Last edited: Dec 4, 2013
  12. White Trash

    White Trash Toyotaholic

    Joined:
    Jan 26, 2011
    Messages:
    1,779
    Likes Received:
    95
    Location:
    Eastern WA
    Truck:
    89 auto cross beater
    I didn't cite as in bring that article up in the first place. All I did was find the source of the copy/paste period. I didn't say the article was right or wrong, just gave you the source.

    Yes I said to run a newer linked jeep in front wheel drive only. Why? Because it is a shining example as to what happens when the axle leads the links. Nothing more, nothing less.

    You've done a great job building a very clean truck I'm not knocking the look at all. If I wanted to keep the tank in the stock location with links I'd run parallel lowers straight ahead with the bottom of the frame notched for clearance, a straight upper on the drivers side and a panhard bar or watts link. The air bag links would be shackle mounted and to the rear to for extra lift.

    Perhaps you've bandaided the suspension enough with nice stiffly valved shocks to keep it in check, maybe you run around with it low enough that the links stay parallel to the ground so they tend to react neutrally I don't know.

    I'm ok with my close-mindedness, thanks. :lol:
     
  13. TRUCK ACTION

    TRUCK ACTION Grand Toyotaholic

    Joined:
    Jan 5, 2008
    Messages:
    4,188
    Likes Received:
    600
    Location:
    Vallejo,Ca.
    Truck:
    88 Extracab,2wd
    Sorry I even got involved in this discussion, wasn't tiring to start a argument. Litneon, your truck looks great & your build is very good!
    And yes I copied & pasted an article on the subject,so what!!
    It clarifies what was brought up,that's all!
    Every one builds what they want & like & that is all there is to it!!

    Pace out everyone & enjoy what you build!! :shrug:
     
  14. Litneon

    Litneon Super Moderator Staff Member

    Joined:
    Mar 29, 2007
    Messages:
    2,414
    Likes Received:
    50
    Location:
    Cocoa, FL
    Truck:
    94 xtra cab
    Ok, I'm sorry. I just get worked up when I'm told that what I've done doesn't do what it does (or does what it doesn't).

    You guys are welcome to drive my truck if you are ever in town.

    The Jeep analogy still doesn't work because any time any vehicle tries to accelerate, it transfers weight to the rear. A reverse link setup cannot transfer enough weight to the front wheels to even come close to the former.

    •I designed my setup, I didn't bandaid it.... I haven't changed it since I finished it.

    Anyway, while I meant everything I said previously, I will in a day or two clean up this thread. I didn't mean for it to get hijacked.... :eek:

    Have a good one guys.
     

Share This Page