|04-07-2014 10:34 PM|
That's why some people can get away with 5* misalignment and some can't.
|04-07-2014 10:29 PM|
|04-07-2014 10:27 PM|
|kjeeper10||Id find a driveline shop and check balance. Not worth chasing your tail if there's a issue with the shaft itself.|
|04-07-2014 10:22 PM|
I removed the shaft and drove, vibes were gone.
Toe was good today at the alignment shop.
|04-07-2014 10:15 PM|
You can remove the shaft a drive without it.
Good way to diagnose vibes too.
What shaft do you have ?
That's what sucks with cam bolts. To remove them you need to weld build the mount holes.
IMO Toe can cause a wandering feeling too.
|04-07-2014 10:03 PM|
Before the cam bolts the caster was 3.6 and was wandering like crazy. So I used them and now have vibes, it either wanders or has vibes.
I'm considering the CA drop brackets, but dont know if that would help or not.
|04-07-2014 09:50 PM|
Jeep Jk, Caster and lifting.
Dam it.. Wifi kicked out ughhh
Let's try this again
4.6 is stock ... 1.4 is right for pinion angle.
0* at the pinion would put the axle at 6* caster and guarantee vibes. Assuming you mean 0* between pinion/driveshaft ?
The front shaft is not under load. Generally u-joints don't like more then 5* . Some get away with it and some don't.
I don't know what you tried. The cam bolts fix caster but add to pinion angle. I see a lot of guys running a 3/3 split but w/ steering a little light.
Did you run it before the cam bolts and still get vibes ? Possible shaft is un-balanced ?
How about toe spec ?
The JK sucks with only 6* separation. A 3/3 split should work. Doesn't guarantee the greatest handling though. Shouldn't be all over the road.
My thinking. If we ran both uppers and lowers pushing the axle out a bit. The angle of the shaft would be reduced, letting you run more separation.
Stand at the base of a mountain and run a string all the way to the peak (this is your driveshaft)
Now stand a mile back and do the same. The angle of that string is reduced no matter what angle your standing at (caster)
Is 1/2 added to CA length going to help ? Sometimes enough to help balance the angles
|04-07-2014 09:17 PM|
Yes I added a double cardon shaft.
Yes trying to balance and can't find the sweet spot.
Just got another alignment today and caster is 4.6
No clue what the pinion angle is cause I can't find a reliable way to find it (unless 6-4.6=1.4?)
I assume with double cardon I need 0 degree at the pinion?
|04-07-2014 09:07 PM|
Are you running control arms ?
How about a double carden shaft ?
Are you trying to balance caster/pinion and can't find that "happy" spot ?
What are your currant specs ?
|04-07-2014 08:09 PM|
|jutgin||By the way does anyone know if the fact that I still have the stock 32" tires on is effecting this issue?|
|04-07-2014 07:42 PM|
Well this has been a great read but I am still unsure of where to got next to fix my angles. I'm either wandering all over the road or have DS vibes.
2013 JKU 3.5" RC lift
|03-08-2014 10:45 PM|
Daylight savings time ... 1 extra hour of COLD
|03-08-2014 10:38 PM|
^^^Well Ken, did it warm up enough for you to pull your top and doors today?
I have mine off, and almost got blown out of my Wrangler today.
81 degrees here, but very windy......
|03-08-2014 10:04 PM|
|kjeeper10||Good ol' TF videos for ya|
|03-08-2014 09:23 PM|
I was up in the back of the Jeep today replacing factory suspension bolts so I took a good look at the TB position and I think this bracket is going to help a lot.
|03-08-2014 04:57 PM|
Here's a vid from Teraflex
|03-07-2014 08:19 PM|
Kudos to kjeeper10 for all the advice and information. I especially appreciate the PMs on roll center and rear track bar bracket. I now have one on order and I also found this article that describes roll center very well and matches to what kjeeper10 has taught me.
Understanding and Tuning Roll Center - R/C Tech Forums
|03-07-2014 03:40 PM|
With the fixed lca's caster is set depending on lift height. The degrees are shown per inch lift there in the link.
Toe will change but ever so slightly. If you already had it aligned and toe set, you should be fine without another alignment. It's up to you whether you want adjustable arms or not. For what you are after, the fixed should work out just fine.
|03-07-2014 03:33 PM|
2014 Rubicon X
OME 2619 front coils
OME 2618 back coils
OME Nitro shocks front/back
Warn Zeon 10-S winch, hoop, lights (added weight)
Best I can measure the lift was around 2.25" but I am not sure if the X already had some lift over a stock Rubicon.
So, the Synergy CAs should be o.k. right or should I get the adjustable ones (much more money)?
Next very dumb question. If I replace the LCAs will I need to get the alignment redone?
|03-07-2014 03:12 PM|
Yep those will work, But don't go by listed coil height. What's your actual height ? You caster is pretty low and I would assume 3-4"over stock height.
Edit: ok never mind. Those arms come only in one size. The caster/lift height note is a good reference.
|03-07-2014 02:39 PM|
Rather than increase the caster with brackets what about these longer LCAs. I just had my 2014 JKU aligned and the caster measured 2.1* and 2.6* on 2.25" lift from OME coils and shocks only. Right now it drives o.k. but I would love to improve it if I can add these. They claim this will get the caster back to 5.5 or so with a 2" lift. What is too high for a caster reading?
Also, is it o.k. to add the front LCAs now and later do the back? I assume yes as they are not related but I have also made other mistakes so far.
Synergy Manufacturing 8047 - Synergy Manufacturing Front Lower High Clearance Fixed Length Control Arms for 07-14 Jeep® Wrangler & Wrangler Unlimited JK - Quadratec
|02-05-2014 05:07 PM|
Yes !! that's the key "actual height" although RK did lower the new front coils by 3/8 or so compared to the first gen.
You won't find anybody running close to 6* with 4" of lift. Like I mentioned in my post. 3/3 or even 2/4 (now this is with a double carden) you do have a little more leeway with the stock DS, but risk CV failure.
6* is where I was at with TF lowers and my shaft went bad.
|02-05-2014 04:13 PM|
No, I don't have an aftermarket bumper or winch yet. On the list though. ;-)
I haven't had a chance to get back under there and take one of the LCAs loose to see if I can shorten it any yet. From what I remember and can see there isn't any real visible threads showing so if I can shorten them any at all, it will only be maybe a half (180*) turn. The krawler joint looks pretty symmetrical in that the protruding sleeve looks like its the same length on either side, so I don't think getting only a half turn will misalign anything.
I also e-mailed with Jason at Krawl-Offroad.com whom I purchased the lift from. He said that, "RK is saying that a castor of anything less that 6* is normal for this setup. So with you being at 5.9*, we should be good. That is for the 1.5” and the 2.5” lifts." My only concern on that is if they are basing that comment on only 2.5" of lift. Although this comment was after I sent him all of my info including lift height.
I think I am still going to:
1. re-check what numbers I get by doing the angle measurement off of both circles on the housing
2. try to get a measurement off of the pinion flange
3. take one of the LCAs loose and see if I can turn it (shorten) it any.
I figure it can't hurt anything, right? Who knows...things may have settled in some since first putting it on and now driving it around some.
It seems to drive just fine both in town, on the interstate and on a real beat up city road.
|02-05-2014 03:51 PM|
Do you have a bumper/winch ?
231/8 Is common if that's what they list.
|02-05-2014 03:48 PM|
Yes. From the RK instructions..... 2.5" Front Lower Control Arm Assembled Length = 23 1/8"
Also, I did a lift height measurement on the front based upon a diagram showing stock measurement taken at the shock tower and also taken at the spring perches. Based upon those measurements, I ended up with 3 3/8" of lift on the front.
|02-05-2014 03:29 PM|
|kjeeper10||Did either of you find measurements for the lCA's ?|
|02-03-2014 08:45 PM|
|JerryJeepster||I'd look it up but not at home for a few days. I know I measured more than twice and then my brother double checked my work.|
|02-03-2014 06:47 PM|
What is the measurement btw ?
Sent from AutoGuide.com App
|02-03-2014 06:46 PM|
|02-03-2014 06:33 PM|
|JerryJeepster||Are you sure you measured them correctly before torqueing the jam nuts? I have the same kit on a 2 door and with rk's measurements the castor was dead on. Each side should have the same amount of threads showing. Maybe I got lucky???|
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