Worlds Fastest RC Car Challenge take 2.
 

Hey guys,
Its that time of year again. going to start to get my truck ready for the event coming up in July. I have already started putting it back together again after crashing it in to the wall last year. New X braces and carbon fiber servo plate went back on last night (courtesy of George from Gorilla. Thanks!).

My question is, looking to get rid of the 2 speed tranny that I have in there now. For top speed purposes, am I better off going to the single speed tranny kit or the Slipperential?
Thanks

Well, the Slipperential would definitely help keep your front end down. This means you will run 4wd. If I recall, the new rules still do not require 4wd... I think in the end ir would be better to have a solid center axle driving only the rear wheels (or even both wheels) as it will ensure that the motor power is not wasted.

For top speed purposes, I would say a center driveshaft with a slipper would be the best. The slipper would protect the drivetrain, but there will be no gear reduction and less rotating mass with just the solid center driveshaft. If you don't understand what I mean here, I basically mean a slipperential without the differential.

John, I will be going this year as well, though I hope to enter a truck this year. I am going to start working again to build up funds.

I believe MetalMan will be entering as well...maybe we can make up team RC-Monster?

With a huge amount of power the center diff will not stop wheelies. I do think a center differential is the way to go. The center diff will weigh less and have less rolling resistance than a transmission. Also you can have some crazy high gearing with a center differential.
If you will be using 2wd or worried about power loss just get a spool for the center diff. Ofna makes one for there center differential.
My trucks were always faster with a center differential. Not sure why, could have been the less rolling resistance or the higher gearing.


Promod

If 2wd is allowed, you could pin the front output so the rear is the only one running. It could be like a free overdrive, though i wouldn't expect the diff to survive, the constant running

I guess I wouldn't really need the slipperential then? More of a center diff is what I would be looking for? Looking for more of a direct drive if you will since I have my slipper tightened all the way now anyway.
So if a center diff is the way to go, any recommendations (link?) to what I should get? Easy to install?
Thanks

Will you still be using dual motors? That could make it a bit harder to use a center diff.

Cool, my Savage already has a center diff :yes:. There will be another real MT contender this year, I just need to start getting it ready :lol:

John, perhaps we can work together to figure out a center diff solution for your truck, if Mike won't be releasing anything soon? Making the parts would be easy for me, but designing it will take time (to ensure proper fitment).

Just take a 1/8th onroad car and put larger tires, a truck body and call it done!!!:lol:
I would think someone would try putting larger tires on a rustler. If they run 70 mph out of the box.
Where are they having the fast RC challange this year?


Promod

I believe its still at the Autoclub Drag Strip at California Speedway in Fontana.

I think this is the result of the pancakes that are created in the front vs the smaller wheels in the rear (without a centerdiff) becase the tires are rather soft, the front wheels are bigger than the rear wheels when driving fast/accelerating. this results in more stress in the drivetrain, since the wheels need to spin at the same speed. (they are mechanically connected) the centerdiff cures this problem.

Have the rules been set for this years wfrcc? Thinking about attending.

They have- there is a link somewhere around here....

EDIT: http://www.rc-monster.com/forum/showthread.php?t=10079

I will check with Mike and see if he has anything in the works. If not probably just go with the single speed tranny for now.
Thanks.

Thanks Neil.

Jhonny, Dafni should be of great help if you need someone to make you a centerdiff. I did not ask him to make me one, so I can't tell if he would do it. I have great expectations in him, though. :)