Differentials are meant to improve your turning capabilities. The way a differential works is when you go through a corner, your outside tire has more distance to cover than your inside tire. Your differential lets your outside tire spin more and your inside tire spin less. There are a few different ways to set up a differential, depending on whether itֳ¢€™s a 2wd or 4wd car, and what track or what type of racing you are doing, but if you are driving a rwd truck on dirt off-roadֳ¢€¦


Lets say you don't have a differential, or you lock your differential. This will reduce your carsֳ¢€™ off power steering drastically. Your inside tire will drive more than it should, and your outside tire won't be driving enough. Both will cause your car to push. You can get through corners faster by breaking traction with your rear wheels, but this will make the car very unstable and you will be spending most of your time spinning out. If you get out of shape while going down a strait, it will be very hard to recover from. Your car will spin out or drive off course.


Now lets say you are using your car with a geared diff and no oil or grease. One advantage to this is amazing off power steering. Your inside and outside tires get to roll as much as they want, and it gets you through the corner fast. This is not good for your on power steering. If you are driving through a large sweeper or exiting a corner, it's almost like trying to fly a high powered rocket with no guidance system. You are going to be very inconsistent, and there is no telling where your car is going to point. If you get out of shape going down a strait and your car starts to spin out, it will turn sideways, but then your rear tires will quickly spin at different speeds and your car will try to snap back to whatever direction the cars' momentum is taking it (fishtailing).


Using the general info I just gave you, you want to find something in the middle that works with what size track you are running on, and your driving style. If it's a shorter track with lots of turns, you might want to use thinner oil. I would start with 3000wt, and go up from there. If it's a larger track with larger turns, you might want to use something like 10,000wt - 20,000wt. Tightening and loosening a ball differential does the same thing, but you only need to turn one screw instead of taking the car apart. A geared differential has an advantage because it can be as loose as you want it. A ball differential can only be so loose, before it becomes too loose and starts to slip. It usually doesnֳ¢€™t need to be this loose on a 1/10 vehicle.

מצאתי תגובה של מישהו מאחד הפורומים בחו"ל שמסביר את העניין בצורה פשוטה ולא רעה.
מגניב.