MaXJohnson
NAXJA Forum User
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- The Kansas Rockies
Beezil said:... go ahead and keep spinning my words.
no spin required. Just responing to your comments.
Suck it up, man. It's only the internet...
Beezil said:... go ahead and keep spinning my words.
Suck it up, man. It's only the internet...
Beezil said:My long radius arms unloaded HORRIBLY. sure, a centered limiting strap worked WONDERS.
Bob Sheaves said:Too bad others do not realize the importance of a balanced approach to suspension design. When an engineer makes a mistake, people die- a fact of life that too many dismiss because of ignorance or supposition.
Beezil said:willis, no, it doesn't seem to....
btw, have you made any decisions yet?
do you have an idea of tire size, or which axles you are going to use, or maybe lift hieght?
how comfortable are you in loosing some sheet metal?
would you consider taking metal out of the floor?
what kind of boingers are you going to use?
Bob Sheaves said:Willis....dying is something that you had best be concerned with, if not for yourself, than be VERY concerned with the responsibility towards others if you take your vehicle on a public road or highway. If you EVER take a modified vehicle on public roads-YOU are responsible for the results of those changes in an accident. A good lawyer will take you to the cleaners for the rest of your life if you make a mistake. Good intentions don't mean a damn thing in a court.
That being said, I wholeheartedly approve of your thought in asking the questions you have. I would only hope you listen to the advice given by Max. You have to make the decisions on how to do the modifications, but thinking before cutting and welding is far more productive than simply dismissing as irrelavent, comments that you disagree with.
Bob Sheaves said:Additional thought Willis...
You may be interested in looking for some old pictures of Mike Leslie's MJ and XJ off road race cars from the late 1980's and early 1990's. The 7's (MJ's) has 19 inches of travel from jounce to rebound (don't ever say "droop" or "bump" to a real engineer...LOL!) in the rear and, as I remember, 22" in the front...all with the equivelent of a 6" ride heigth increase relative to axle centerlines (means discounting tire related increases).
Check out the boards at racedezert.com-there are some of the old guys there that may have some.
Best regards,
Bob
Bob Sheaves said:The Dodge pickup suspension fixes a lot of the inherent limitations of the XJ/MJ design. How do I know....I was responsible for all the 4x4 BR suspension design and parameters at JTE in the old PreProgram group. There is a distinct difference between the two in perfromance of the suspension. As it relates to the anti-dive discussion, the XJ has 18% and the Dodge has 36%. The Dodge has far less non-symetrical axle steer due to linkage compound ratios when co,mpared to the XJ/MJ.
Best regards...
Bob
Mark Hinkley said:Bob,
Seeing your saying you're a Dodge engineer, working for Dodge either directly or indirectly thru a subcontractor, if I'm wrong please let me know. If I'm not where do you work?
Mark Hinkley said:Couple questions on the Dodge.
First off I truley hated my 95 dodge 4x4 2500hd quad cab long bed suspension/braking system.
Mark Hinkley said:What was it in the suspension that allowed for massive side pull during braking with oversized tires verses stock size tires. All the people who have explained it to me have never done a great job on this.
Mark Hinkley said:With all the beef in that front suspension why was such a crummy track bar used. It's gotta be one of the most under engineered things on any truck suspension in the last 10 + years.
Mark Hinkley said:I'm no where close to understanding all the suspension design you guys are talking about but have messed with the XJ/MJ suspension in it's relative stock/modified forms. Staying with basic stock type mounting. I do know what works on and off road, maybe not by design stats but by what it does.
BTW I always love when engineers boast about if things aren't engineered right people die. Do you realize how many people have died from engineers making mistakes?
Mark Hinkley said:All engineered or DYI aren't perfect but most try to be as good as they can be, because noone wants to see anyone die from a mistake.
I will say I'm always amazed at how many DYIs do do such hugh suspension changes and what they get away with. But then some of the big suspension manufacturing companies blow me away with what they get away with too.
mark
Sorry to hear that-over 90 percent of those that bought the truck initially bought another.
While I cannot comment on other people's hearsay, I am afraid you have not given me enough information to determine what was "wrong", if anything. Oversize tires change the response geometry due to a greater didtance from the center of the hub to the ground contact patch-greater leverage means increased loading from braking transferred to the pivot axis (the hub centerline). Changing the load in the vehicle will alos make a difference-as little as 3/4" change in the relative height of the frame mounts for the control arms and the frame end of the panhard rod will alter this reaction to braking.
What makes you say the problem lies with the panhard rod? That bar is far stiffer than anything the XJ has, proportionally. Perhards the fault lies elsewhere.....like the frame bracket loading???
Yes, as a matter of fact I do, since I deal with this stuff everyday, and have for over 28 years.
Does anyone here remember Jackman Wheels?