Originally Posted by Mal
I don't understand why having a delrin spool or having a steel spool would make any difference in why the car would chatter. From exepereince, I've found that cars using foams and a spool will chatter more. This is because foam tires have more traction meaning they slip less. When taking corners the inside tire and the outside tire spin at different rates (With a normal diff). When you run a spool the tires are forced to spin at the same rate, this is what causes the chatter.
No matter if you're using a diff, spool or one way, if you steer to one side the driveshafts will chatter, that's a FACT and it's due to the DESIGN of the driveshafts.
Now, you don't FEEL it with a diff or one way, because there is some give away with them. They allow the driveshafts to rotate at their own speed (which oscillates when you steer even if your keep the throttle constant), thus you don't feel the chatter on the wheel side.
Try this easy test : have your car sit all 4 wheels in the air (with tyres on), give a bit of throttle with the trim so that the motor turns at reasonable speed. Now steer left to right, you'll hear the driveshafts making noise. That's chatter, the wheels are trying to keep turning at the same speed because of their inertia, while the driveshafts are trying to make them have their speed oscillate. Even with a diff or one way you should be able to hear it when doing that test.
The reason why you FEEL it with a spool, especially a steel spool, is that there is NO give away. No matter what, the spool will have the driveshafts rotating at constant speed, and because of this, the wheel's rotating speed will oscillate more than with a diff or one way (or delrin spool, since it will not be as stiff as a steel spool). If you put the car on the track, you have a drivetrain that wants to rotate at constant speed, and wheels that wants to rotate too at constant speed, and between them, driveshafts that are trying to change their speed constantly.
This is why it chatters only with a spool, it has NOTHING to do with the difference of radii between the inside and outside wheel, that only puts more strain on the driveshafts, along with taking some of the mid corner steering.