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Author Topic:   Cushioned J-bars???
MOD RACER#93
Member
posted January 06, 2001 09:59 PM
I run them on my dirt late models. The only real advantage I see is that when you move the bar up or down, you can adjust it's length and keep the rear in the same place left to right.

30owner

Limited5
Member
posted January 07, 2001 09:22 PM
Solid bars are adjustable also on their mount at rear, rubber ones are supposed to promote side bite. I've had both and could never tell a difference. I think its just another "trick of the day" piece.


jammin
Administrator
posted January 07, 2001 09:28 PM
I have always wondered why someone doesn't try a spring bar on this....it would move the weight way over the right rear in the turns and allow the car to roll over even more without breaking the rear tires loose like a straight bar would. I think a rubber setup would be virtually the same thing, just not quite as much....

My thoughts.

MOD RACER#93
Member
posted January 07, 2001 11:02 PM
the spring bars are illegal in most modified sanctions because they use springs smaller than 5". Either way i agree with limited as bein just a trick of the week deal. The prob i see is that the movement is dependant on track condition....the more grip the farther it compresses and vise versa.... so basically as the track dries you will loose sidebite which is opposite of what most people want to happen.


jammin
Administrator
posted January 08, 2001 01:49 PM
But couldn't you actually lighten the spring rates for that?


dirtrackracer
Member
posted January 08, 2001 04:41 PM
yes you could soften the spring but you would have to be able to predict the track, and i agree w/the above post about being inconsistant, the reaction of the car is too dependant on the force applied to the bar. having the spring adds another variable into making a car handle


jammin
Administrator
posted January 08, 2001 05:44 PM
Well...my thoughts on this are if the weight could be transferred over the right rear this way, it would be just like adding weight high and to the right in that it would allow more weight to transfer over to this side. If it does this, it will put more side bite in the car and would allow you to enter the turns harder without breaking the tire patch. I think the spring rate for the bar would definitely be something that would have to be played with to get the correct rate for angle as well as the track. The angle of the arm is going to be directly related to the rate. I have thought about this quite a bit and just wanted to know everyone's opinion on it. I usually dont get this deep into posts on the forum but I will on this one. One other thing to think about here is that if your running a lift bar, then it would also move the lift bar to the left in the turns and would promote more roll.

Just a thought.

jammin


77Racer
Member
posted January 08, 2001 06:44 PM
I've been running the rubber J-bar for two years.I've also been going lighter and lighter on the r/r spring, down to a 125 on my heavy 9 year old car.The solid bar on a rough track, tends to loosen up on the rear end bracket,the spring would be great,but against the rules.I've heard of late model guys that run the rubber and have different amounts of rubber bushings on them,more for drier,less for tacky.I was always told "you won't learn unless you try".


MOD RACER#93
Member
posted January 08, 2001 07:19 PM
That was the same problem I was having with the solid bars. Bolt was always coming loose The last one I had bent. The rubber cushion would probably be more forgiving than if you missed spring rate. The spring bars may not be legal.. I haven't seen any on mods here, but I have seen the rubber ones. Wouldn't the absorbing, and moving the rear make for a smoother handling car? This is what im looking for... Ive seen where smooth cars are sometimes faster than fast radically setup cars that are hard to drive.

[This message has been edited by MOD RACER#93 (edited January 08, 2001).]

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