Ok Here is a new Idea from Drag Race source. Lets talk .

[LowBuckX]

Local guy here has a Digger with a 4 link and a Mono shock.

He said his chassis builder was trying to figure out a way to build a Pro-Touring rear with a MonoShock and heavy swaybar. I couldnt think of why or whynot if it could work..
Has this ever been tryed..Could it work? lots of on road RC cars are mono shock rear... Dunno thinking out loud,,. No Im not going to guineapig it.

[Rhino]

By monoshock, are you talking about using a single shock on the entire rear axle?
If so, The really heavy roll resistance may, or may not work with your chassis. That's something that you'd have to test. I would be inclined to say it could be detrimental.

The heavy sway bar will do a good job at resisting the upward momentum in a bump, but will add to the rebound. I don't think that uncontrolled rebound would be a good idea.

I think the reason it would work for drag cars is that they typically want the maximum roll stiffness they can get.

[LowBuckX]

Im not thinking of doing this myself just posting the thoughts of another person.

[Rhino]

I figured so, Just trying to add to the discussion. :)
You are talking about a single shock, correct? If so, How/where is it mounted? At axle center? At the edge?
I would imagine if the shock were much stiffer, and offset to one side, it would be better than centered.

[LowBuckX]

Chassis I looked at was like this...Coil over is one with the swaybar. https://static1.pt-content.com/images/pt/2009/11/4linkJPG-1.jpg

[Rhino]

Wow, that's odd. I may be wrong about this, but it looks like this would also cause the sway bar to act as an additional spring.

Out of curiosity, did he explain the theory behind it?

[LowBuckX]

I didnt talk to builder just the owner... He know as much as he needs to. "I step on loud pedal an it goes fast. If motor makes bad noise I have someone fix it" LOL

[jfaria78]

It is probably a super comp car right?

The theory behind that one is that when the car leaves the line it is running at a much higher speed then it needs, when the throttle stop kicks in the car needs to some how unload the positive energy in the chassis without losing traction, so the fix was to put that shock and suspension on a dragster...

It is not that popular with most traditional drag racers but it has been winning the races as of late. For a car that is meant to go around corners I do not think it would work, your car is not light enough. That dragster only weighs 1300 pounds... or so.

James

[Norm Peterson]

How does that arrangement provide any damping with respect to roll rotation? Roll damping, or more precisely the lack of it at one end, will affect transient handling.

I suppose that you could make the rear sta-bar so stiff that the amount of rotation in roll would be negligible, but I doubt that such a "solution" would be very street-friendly.

I can see where an initial push that transitions toward or into oversteer could easily result.


Norm

[Rhino]

...I suppose that you could make the rear sta-bar so stiff that the amount of rotation in roll would be negligible...


I tend to agree. The more I think about it, this probably has very little to do with a roll bar as we know it. Since you want an extremely high roll resistance on the rear of these cars, it's probably engineered to not allow any roll. It's also a light weight/convenient way to package the coil over. Two birds... one stone.

[jfaria78]

remember handling isn't an issue when you are running in a straight line.... That is the beauty of drag racing.

James

[jfaria78]

http://www.landsharkdragsters.com/235swingarm.htm

[Norm Peterson]

remember handling isn't an issue when you are running in a straight line.... That is the beauty of drag racing.

James
Understood.

However, the original post opened up the question of this arrangement's applicability to a PT sort of car.


Norm