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03-14-2016, 06:15 AM | #1 |
Quarry Creeper Join Date: Feb 2016 Location: Australia
Posts: 252
| Front wheels making weird vibrations at full lock
Hi all. I upgraded my front knuckles to aluminium which fixed my "turn sharper one way then the other" issue, but now at full lock I get a kind of "chugging" action on the front wheels. I reduced the end points a fair bit until it stopped but now my turning radius is worse then my real car!! Would this be the binding issue from using the stock shafts? Is the only way to fix this to upgrade to CVD'S or can I grind a bit off to get a bit more angle. Money is tight so hoping for a "good enough" cheap option. Thanks all. Australia SCX10 Honcho, Twin Hammers |
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03-14-2016, 06:52 AM | #2 |
I wanna be Dave Join Date: May 2007 Location: Taylors Falls just hanging with the MNRCRC crew.
Posts: 7,843
| Re: Front wheels making weird vibrations at full lock
If you are using a universal joint front axle its probably the universal beating itself up by adding more steering capability its hitting. If thats the case you can reshape the ends of the universal with a Demel.
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03-14-2016, 07:26 AM | #3 |
Quarry Creeper Join Date: Oct 2014 Location: East
Posts: 232
| Re: Front wheels making weird vibrations at full lock
Disconnect the drive shaft to allow the front to free-wheel. Turn full lock each way while looking to find where the issue is occurring. Once you understand where the issue is you can plan on steps to mitigate it. You should be able to feel when it happens and then look at the associate parts. My bet is if you using the dogbone setup, the cogging happens every time the dogbone shaft meets the slot in the cup. Sent from my XT1575 using Tapatalk |
03-14-2016, 03:22 PM | #4 | |
Quarry Creeper Join Date: Feb 2016 Location: Australia
Posts: 252
| Re: Front wheels making weird vibrations at full lock Quote:
So I read somewhere I can grind a little bit off the cups to give the shafts more room at lock. I'll give this a try. Thank you all for helping. Australia SCX10 Honcho, Twin Hammers | |
03-14-2016, 06:04 PM | #5 |
Quarry Creeper Join Date: May 2011 Location: Battle Ground WA
Posts: 429
| Re: Front wheels making weird vibrations at full lock
Normal, assuming you're not binding anything. U-joints, dog bones and RC CVDs (not true constant velocity joints) cause a change in speed as angle increases, the tire speeds up and slows down when you turn, even though the axle speed is the same. You can even feel this in a 1:1 4x4. This is also why drive shafts need to be in phase and have matching angles at each end, the two angles cancel out the change in velocity.
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03-15-2016, 03:01 PM | #7 |
Quarry Creeper Join Date: Feb 2016 Location: Australia
Posts: 252
| Re: Front wheels making weird vibrations at full lock
That's a great video. So I'll check to see if my.dog bones are facing the save way and see if that makes a difference. One thing I noticed is that the shaft itself is NOT touching the cup sides. Australia SCX10 Honcho, Twin Hammers |
03-15-2016, 05:23 PM | #8 |
Quarry Creeper Join Date: Dec 2015 Location: United States
Posts: 447
| Re: Front wheels making weird vibrations at full lock There's more than one type/style of constant velocity joint, the CVD's from MIP and similar style RC joints are a variation on the Tracta and Weiss joints. Although different from the Rzeppa and Tripod joints we typically see on cars, they're still constant velocity joints.
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03-15-2016, 05:51 PM | #9 | |
Quarry Creeper Join Date: May 2011 Location: Battle Ground WA
Posts: 429
| Re: Front wheels making weird vibrations at full lock Quote:
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03-15-2016, 06:13 PM | #10 |
Quarry Creeper Join Date: Dec 2015 Location: United States
Posts: 447
| Re: Front wheels making weird vibrations at full lock |
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