03-22-2014, 04:33 PM | #1 |
Pebble Pounder Join Date: Jan 2014 Location: NB Canada
Posts: 104
| CMS limits steering?
Hey guys, still a bit of a newbie here but thanks to all the great threads and advice in the forums I feel far more confident then I ever used to. I installed an RC4WD CMS/Panhard kit on my wraith. I know there is no performance gain, but I like the idea of being able to easily separate the chassis from the body easier with the CMS kit. My issue is that due to the change in angle from the servo to the ackerman, it seems to have limited my steering, especially to the right. Its almost that the servo turns beyond usefull stroke. I haven't take any pics of my setup but here it is from the RC4WD site. Has anyone else battled this or have any suggestions? Any help is greatly appreciated. (one is with the bent link, one with the straight - I don't think that makes a difference) |
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03-23-2014, 11:33 PM | #2 |
Pebble Pounder Join Date: Oct 2010 Location: Cincinnati
Posts: 107
| Re: CMS limits steering?
try powering up the servo and centering the servo horn to have equal steering both ways. hard to say what the true issue is without knowing your set-up
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03-24-2014, 10:17 AM | #3 |
Pebble Pounder Join Date: Jan 2014 Location: NB Canada
Posts: 104
| Re: CMS limits steering?
Thanks for the reply. I hae done that with the original setup and have gone back a few more times to make sure. I wonder if the issue is that even though the servo has equal swing both ways, the relation of the arc of swing from the ackerman arm is not the same side to side, does this make any sense? |
03-24-2014, 10:55 AM | #4 |
Pebble Pounder Join Date: Oct 2010 Location: Cincinnati
Posts: 107
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What c-hubs, knuckles, and steering link are you running Sent from my SGH-T769 using Tapatalk |
03-24-2014, 05:53 PM | #5 |
Pebble Pounder Join Date: Jan 2014 Location: NB Canada
Posts: 104
| Re: CMS limits steering?
stock chubs and knuckles are the stock kit plastic ones, link from the servo to the ackerman was supplied with the rc4wd kit, and the link between wheels is STRC
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03-24-2014, 05:55 PM | #6 |
Pebble Pounder Join Date: Oct 2010 Location: Cincinnati
Posts: 107
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Do you have stock dogbone axles Sent from my SGH-T769 using Tapatalk |
03-24-2014, 09:13 PM | #7 |
Pebble Pounder Join Date: Jul 2012 Location: Crawlerado Springs
Posts: 168
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May just be the angle of the pic, but appears you axle is not centered under the chassis. If the axle is offset to the right that could be some of the issue. Good luck! Sent from my SGH-T999L using Tapatalk |
03-24-2014, 09:14 PM | #8 |
Pebble Pounder Join Date: Oct 2010 Location: Cincinnati
Posts: 107
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The pic was from rc4wd to show his cms kit. That's not his actual truck Sent from my SGH-T769 using Tapatalk |
03-24-2014, 09:26 PM | #9 |
Quarry Creeper Join Date: Dec 2008 Location: Santa Mira
Posts: 342
| Re: CMS limits steering?
Its look to me that your truck height needs to come down. I was having the same problem with mine. Just lower the truck down a little and you will gain turn radius.
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03-25-2014, 04:51 AM | #10 | |
Pebble Pounder Join Date: Jan 2014 Location: NB Canada
Posts: 104
| Re: CMS limits steering? Quote:
The issue to me looks as though when the servo is pulling the steering link (to make it turn left) the servo arm has lots of throw. However when the servo is pushing the steering link (to make it turn right) it seems to hit its max arc of swing and that's it. I'll try to take some pics and post tonight. Also, I'm only running on the middle hole of the axial aluminum servo arm, maybe I should try the one furthest out. Thanks guys, keep the ideas coming... | |
03-25-2014, 05:42 AM | #11 |
Newbie Join Date: Jul 2013 Location: Moranbah, AUST
Posts: 34
| Re: CMS limits steering?
I found my servo doing the same thing. Turned out to be fouling on the chassis cross member a little and the bolt for the steering link was just a little to long. After I trimmed it down to be flush with the rear of the servo horn and it was fixed. You might have probably already checked this tho.
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03-25-2014, 05:44 AM | #12 |
Pebble Pounder Join Date: Oct 2010 Location: Cincinnati
Posts: 107
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Yeah definitely furthest hole out. You're right, it has universals. Try clocking the servo horn so it doesn't hit max arc to the right. Or maybe a longer steering link instead of the ones in your kit Sent from my SGH-T769 using Tapatalk |
03-25-2014, 06:22 PM | #13 |
Pebble Pounder Join Date: Jan 2014 Location: NB Canada
Posts: 104
| Re: CMS limits steering?
Here are the pics, it seems when turning right instead of pushingi the steering further it just lifts the link, as if its out of reach... have a look from the top at the difference. And yes, the horn is centered on the servo. Now that I looked at it in the pics it doesn't look that bad... but very noticable driving.. straight: right: left: |
03-25-2014, 06:28 PM | #14 |
Pebble Pounder Join Date: Oct 2010 Location: Cincinnati
Posts: 107
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Maybe try turning the horn more to the left when the servo is centered so you get more push to the right. Then you could adjust it back to straight with the trim Sent from my SGH-T769 using Tapatalk |
03-25-2014, 06:45 PM | #15 |
I wanna be Dave Join Date: Feb 2013 Location: NW Indiana
Posts: 3,196
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You need a little longer rod from the servo to the right wheel..or straighten that a little bit...the one u have is not at the same angle as the panhard rod...i personally would bend it enough to be parallel with the panhard....that will help some. If its not enough get longer ends or a longer rod...its that simple
Last edited by allanon1965; 03-25-2014 at 06:55 PM. |
03-25-2014, 06:53 PM | #16 |
Quarry Creeper Join Date: Jan 2009 Location: B-E-A-utiful Vancouver Island
Posts: 400
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Your tierod should run parallel to the pan hard bar.... Get rid of that bent one and put in a straight to run parallel and that should help
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03-26-2014, 02:47 AM | #17 | |
Newbie Join Date: Jan 2014 Location: BFE
Posts: 21
| Re: CMS limits steering? Quote:
Straight or bent doesn't matter, the bar could be bent to look like a chicken and it would act the same as a straight bar assuming it's rigid. As high above axle centerline as your servo is, try setting your servo horn one or two teeth the the right when looking front to back, or, to the "drivers" side. By setting it straight vertical you're POSSIBLY losing some steering throw to the right. | |
03-26-2014, 05:04 AM | #18 |
Pebble Pounder Join Date: Jan 2014 Location: NB Canada
Posts: 104
| Re: CMS limits steering?
Thanks guys, I'll try moving the horn tonight. The RC4WD kit came with a straight link and a bent one, I thought the bent one looked nicer and as Squatchy said, it shouldn't make a difference what the shape is as long as the distance between the two connection points is the same. |
03-26-2014, 06:35 AM | #19 |
I wanna be Dave Join Date: Feb 2013 Location: NW Indiana
Posts: 3,196
| Re: CMS limits steering?
thats just it, the distance will not be the same. if you take the bent one and measure between the holes in a straight line and get the measurement of say...2-3/4 inches. now if you straighten that rod and remeasure, it will now be longer between the holes...how much depends on how straight you make it. It DOES make a difference..in my example it is now 3 inches long. a gain of a 1/4 inch. I am saying to straighten the bent one first, not replace it with a straight one as the straight one might be just the same length as the bent one when measured hole to hole. These kits sometimes need slight modifications to work as intended, due to differences in every ones setup... |
03-26-2014, 07:25 AM | #20 | |
Pebble Pounder Join Date: Jul 2012 Location: Crawlerado Springs
Posts: 168
| Re: CMS limits steering? Quote:
Another thought I had is disconnect the steering linkages and make sure there is no binding when turning right at the knuckles. If there is it could be the servo lifting the chassis instead of turning the wheels. Much more prevalent on vehicles with taller ride heights Anyway, Good luck! | |
Tags |
cms, rc4wd, servo, steering, wraith |
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