What does the center diff do and does it eliminate my reverse??
The center diff on a Revo does 2 things..well actually 3..
First..Why Have Differentials
Hopefully it's no surprise why we have differentials, but if you were just born here's a quick explanation: During a turn the inside wheel travels a shorter distance, and therefore can spin at a slower speed than the outside wheel, which has to go farther. Since both are on the same car, it would be difficult for that to happen without the invention of the differential. A diff allows one wheel to spin faster than the other, which improves handling in corners. In four-wheel-drive vehicles a third diff is used in the center, to allow the front and rear wheels to travel at different speeds as well.
Without any friction with the ground, the system would transfer power to the wheel with the least resistance, and result in a loss of speed in a corner and over bumps. We've all seen Subaru commercials explaining that having power to the wheels that grip (have the most resistance) improves handling. The way that is controlled in RC vehicles is with silicone diff fluid (and in some cars thick grease). This acts as a "limited slip" differential, and allows the wheels to spin at different speeds - but maintain power delivery to the wheels with more traction. The thicker the oil, the closer to a solid axle the diff acts, and the thinner the closer to an open differential it is.
It is by controlling the diffs with fluid viscosity that we alter the handling characteristics of a car for faster acceleration or more steering.
The second thing that the center diff does is eliminates reverse in a revo. The last thing that the center diff does is allows you to install the rear brake.
The rear brake kit is it worth it?? and what chassis modifications are needed?
If you Race the answer to that question is YES..the brake kit is pretty much a "must have" it allows you to adjust brake basis (I have mine set at 40% front 60% rear) and this aids in how well you can turn and it lets you carry a lot more speed into a corner by allowing you to brake much later and still have control over your steering. If you have the 3.3 chassis no mods are needed to install the brake kit..If your planing to race the 3.3 chassis is also a must have, so if I was going to install the center diff and the rear brake kit and I had the 2.5 (shorter) chassis I would change the chassis also. But if you have 2.5 chassis you do need to cut the chassis so the brake calipers fit, They do include instructions on how to do the modification.
Also what's a good weight oil for the shocks on a dirt track..
I have a base line set up (Steve Slayden's) that works for most tracks.. For shock Oil:
Front: 60wt. #1 piston, Gold springs.
Rear: 60wt. #2 piston, Tan springs.
I also set my shock length to 96mm (end to end).
Sorry for the long post..just trying to help..:yes:..I hope this helps..
