RCCrawler Forums

RockRacer1 · 11-21-2006, 06:35 PM

Im building a tuber/tlt for my son. I have moved the lower links up outa the way ( from the stock location on the axle). I have put the L-plate on top for the uppers , then I noticed the pinion moves side to side during flex.
Is this normal ?
on my old tuber the pinion stays dead center during flex ( the axle mounts are stock).

mr.maxx · 11-21-2006, 09:05 PM

pictures???? It doesn't sound normal.

Thorsteenster · 11-21-2006, 09:30 PM

how much is it moving? looking at mine and cycling the sus it does move slightly to one side or the other if one side is compressed and not the other. if its only a little i'd say your fine, your shafts u-joints or ball/cup joints will compensate for this. if its alot you probably need to rethink your link mounting points.

RockRacer1 · 11-21-2006, 09:48 PM

I can minimize it by lowering the uppers at the axle. I saw another rig that did it slightly too and it competed very well . I have seen utrcrc rigs with this same set-up.

JohnRobHolmes · 11-21-2006, 09:58 PM

The cause is your location of roll center. It is not centered on your pinion. If your upper links are very high, it will cause the pinion to move in a lazy U shaped arc.

I wouldnt worry about the pinion swaying if your rig performs well. The roll center in relation to the chassis CG is more important than the axle.

RockRacer1 · 11-22-2006, 08:38 PM

thanks for the help, you guys Rock

11-21-2006, 06:35 PM	#1
RockRacer1 Quarry Creeper Join Date: Jul 2006 Location: Formula Off-Roading some hill Posts: 277	pinion moves sideways during flex Im building a tuber/tlt for my son. I have moved the lower links up outa the way ( from the stock location on the axle). I have put the L-plate on top for the uppers , then I noticed the pinion moves side to side during flex. Is this normal ? on my old tuber the pinion stays dead center during flex ( the axle mounts are stock).

11-21-2006, 09:05 PM	#2
mr.maxx Quarry Creeper Join Date: Feb 2006 Location: Shillington Posts: 462	pictures???? It doesn't sound normal.

11-21-2006, 09:30 PM	#3
Thorsteenster I wanna be Dave Join Date: May 2006 Location: Arlington, VA Posts: 3,377	how much is it moving? looking at mine and cycling the sus it does move slightly to one side or the other if one side is compressed and not the other. if its only a little i'd say your fine, your shafts u-joints or ball/cup joints will compensate for this. if its alot you probably need to rethink your link mounting points.

11-21-2006, 09:48 PM	#4
RockRacer1 Quarry Creeper Join Date: Jul 2006 Location: Formula Off-Roading some hill Posts: 277	I can minimize it by lowering the uppers at the axle. I saw another rig that did it slightly too and it competed very well . I have seen utrcrc rigs with this same set-up.

11-21-2006, 09:58 PM	#5
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	The cause is your location of roll center. It is not centered on your pinion. If your upper links are very high, it will cause the pinion to move in a lazy U shaped arc. I wouldnt worry about the pinion swaying if your rig performs well. The roll center in relation to the chassis CG is more important than the axle.

11-22-2006, 08:38 PM	#6
RockRacer1 Quarry Creeper Join Date: Jul 2006 Location: Formula Off-Roading some hill Posts: 277	thanks for the help, you guys Rock

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Thread: pinion moves sideways during flex