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JeepSpeed, Prerunner and Competition Tech Forum For Discussion of Modications related to Prerunning, JeepSpeed, KOH, Rock Racing, and any other speed based competitions

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  #1  
Old October 13th, 2006, 13:08
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JeepSpeed and Front Long Arms

Without getting into the specifics of which vendor makes what...

For high speed driving like in JeepSpeed racing...

Does the loss of an adjusting caster curve on a radius arm type setup really give anything up to a 3+ link long arm setup where caster can change?
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  #2  
Old October 19th, 2006, 06:40
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Re: JeepSpeed and Front Long Arms

Anyone?
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  #3  
Old October 19th, 2006, 06:42
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Re: JeepSpeed and Front Long Arms

I don't know anything about it, other then pretty much all of them run 4 linked front ends. So it's gotta be for a reason.
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  #4  
Old October 19th, 2006, 06:47
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Re: JeepSpeed and Front Long Arms

I know nothing about JeepSpeed. I want to learn more though.... That style of driving doesn't exist much in Colorado, at least in the Pikes Peak area (yes, yes I know the hill climb, but that doesn't count) so I am pretty unaware of anything and everything about racing an XJ.
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  #5  
Old October 19th, 2006, 08:11
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Re: JeepSpeed and Front Long Arms

What got me wondering about this was this thread:

http://www.naxja.org/forum/showthread.php?t=99649

Basically, the idea is that radius arms ride better on highway than short arms and drop brackets.

That to me seems, well, non-intuitive. Sure, radius arms are long enough to minimize the expected pluses of caster/camber gain at highway speeds but still...

The only thing I can think is that perhaps the DB'ed Jeeps referenced in that thread have DBs that are not long enough for the amount of lift on them. Or, there are other issues like spring rates, tires, alignment, etc. at play.

What says the collective? Speculations?
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  #6  
Old October 19th, 2006, 08:47
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Re: JeepSpeed and Front Long Arms

If you are asking, for high speed driving purposes, if a 36 inch long radius arm is inferior to a 36 inch long 3 or 4 link, the answer is no. I've had both, and driven both at fairly high speeds (65 tops in the dirt), and there is very little difference. Shocks and spring rate selection is FAR more important.

You can pretty easily calculate the caster change of a radius arm set up over the length of travel. Figure, on a 14" travel shock, 8" down and 6" up, start with 6 degrees of caster. It's not much.
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  #7  
Old October 19th, 2006, 18:41
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Re: JeepSpeed and Front Long Arms

i drive mine with the clayton arms real fast all the time and it does great... and my front DS will be in much better shape at droop
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  #8  
Old October 1st, 2008, 09:28
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Re: JeepSpeed and Front Long Arms

Not to get off topic or hijack this thread, but how are you guys finding the proper spring rate and shock selection for your application.

I just installed a clayton long arm conversion for the front and got rid of my RE drop brackets and short arms. I have the 5.5" lift kit thats four years old now and 1.75" coil spacers on the front springs because of my heavy winch bumper.

I would like to take out the coil spacers and still be able to stuff my 35's with a respectable amount of droop; I jsut dont know much about spring and shock selection to get the right results.

FYI- My front shocks are Old Man Emu LT35's and I have the RE ZJ 4.5" lift coils.
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  #9  
Old October 1st, 2008, 09:32
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Re: JeepSpeed and Front Long Arms

Um, it's a 2 year old thread.
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  #10  
Old October 1st, 2008, 10:05
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Re: JeepSpeed and Front Long Arms

Quote:
Originally Posted by goodburbon View Post
Um, it's a 2 year old thread.
So we can teach people to search, but they aren't able to ask questions when they find related tech???
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  #11  
Old October 1st, 2008, 10:16
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Re: JeepSpeed and Front Long Arms

A fair amount of the guys out this way seem to like Skyjacker 8" coils, maybe cut down a little, for go-fast driving in rock crawlers with winches and bumpers.

Bilstein 7100 shocks are adjustable so you can tune them until you like the ride and handling.
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  #12  
Old October 1st, 2008, 12:28
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Re: JeepSpeed and Front Long Arms

i'm just saying that he doesn't have to worry abour hijacking
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  #13  
Old October 1st, 2008, 12:51
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Re: JeepSpeed and Front Long Arms

Thanks to those of you who perfer to post relative information instead of resorting to flame every person who posts. There is no need to fill up all the threads with nonsence like that. My question has grounds for reason.

Back on topic,
PHil- What size bilstiein's do you run, travel? How is the on road handling?

I found a pretty wide range of opinions on this and thats why im asking. I want to get the ride dialed in since this is the third syspension change and hopefully the last one.

Does anyone run the Tomken coils that have a tappered upper section. This seems like it would offer variable spring rate due to the dia. and pitch differences?
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  #14  
Old October 1st, 2008, 13:01
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Re: JeepSpeed and Front Long Arms

I just run the 5150 Bilsteins, 12" front, 8"(?) rear, stiff valving. They're great on and off road.

I run Rubicon Express springs all around.
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  #15  
Old October 1st, 2008, 13:06
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Re: JeepSpeed and Front Long Arms

Quote:
Originally Posted by RE-xtremeXJ View Post
Thanks to those of you who perfer to post relative information instead of resorting to flame every person who posts.
Quit your wanking, you have obviously never been "flamed" before if you think you were flamed.(although I do commend you for searching prior)

Back on topic......deaver makes progressive rate coils that work well, the skyjacker 8" springs trimmed down also work really well if you are looking for stiffer. My old set-up was Skyjacker 8" coil springs with bilstein short body 7100's 12" trvl with 275/78 valving, it worked really well. So you never really mentioned what terrain you are building for. You should take the springs out and cycle your suspension and see where/what is limiting your travel, measure shock mounts and buy appropriate shocks.
Good luck
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