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Author Topic:   pull bar and torque link??
driver27
Dirt Maniac

Total posts: 194
posted September 27, 2004 11:14 AM  
I read somewhere that a few people were running a pull bar and a torque link with only a chain on it. What is the purpose of this arrangement and how does it help the car? How would you set something like this up? just curious.

Thanks

Kromulous
Dirt Forum Champ
Total posts: 796
posted September 27, 2004 11:28 AM  
I've seen cars with a pull-bar for fwd traction dampening, then a lift-bar with a 6th coil on it for braking dampening. This set up would leave the 5th coil off.

Basicly one works one way the other works the opposite. I've heard on fast tracks its nice because the pull-bar gives good fwd bite and the 6th coil gives you good braking responses.

Never seen one with just a chain limiter, that doesnt make much since thou. Only thing it would be for is to control pinion angle. Alot of weight to give up when you can do the same thing with a standard pull bar.

speedy46
Dirt Maniac

Total posts: 165
posted September 27, 2004 12:10 PM  
it helps u braking and it must work alot better because it is what all the skyrockets and usmts run but it ISN"T IMCA LEGAL

driver27
Dirt Maniac

Total posts: 194
posted September 27, 2004 02:01 PM  
Anyone out there actually run one of these setup, it does seem heavy for a little gain, so surely im missing something?

PEwaste
Dirt Roller

Total posts: 14
posted September 27, 2004 02:04 PM  
heavy????
I've heard some people say it did squat and some say it helped a ton... it depends on if your a gas man or easy foot..
if your a gas man in the car then no... if you go easy into and hard out of the turns then i think it would help

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted September 27, 2004 02:16 PM  
It is for braking purposes and it will shut the car down quicker when you lift. The harder you brake the more it plants the car. I know guys talk about being able to drive in 2-3 cars deeper and still get the car shut down in time to get through the corner.

sdracer12
Dirt Maniac

Total posts: 180
posted September 27, 2004 10:25 PM  
quote:
Originally posted by dirtbuster:
It is for braking purposes and it will shut the car down quicker when you lift. The harder you brake the more it plants the car. I know guys talk about being able to drive in 2-3 cars deeper and still get the car shut down in time to get through the corner.

I agree with the above post...
Our setup now uses an afco bearing pullbar mounted over the rearend (with the brake bushing removed), and a torque arm with a brake chain and rubber bumper only.

We went to this setup this year, and I really really like it. You get the benefits of a pullbar on acceleration, and the torque arm really pulls the car down into a corner on entry. The corner entry of my new car is definitely better. I can drive it deeper in, and the car really carves in and "sticks" on the brakes.

I have run without the pullbar, on a traditional liftbar setup with the spring on the torque arm. I think the pullbar gets bite quicker for corner exit, especially on shorter tracks.

One other thing, we run a 90/10 shock over the rearend when I am on American Racers. Then, we have been switching to a straight 73 shock on the torque arm for Hoosier A-40's. Car is too tight on entry with the 90/10 shock on Hoosiers...

Anyone have any other thoughts on this setup??



driver27
Dirt Maniac

Total posts: 194
posted September 28, 2004 06:24 AM  
sdracer, any chance you could send me a picture of your setup? IM thinking I might give it a try if I can rig it up without too much fab work. So you take the rubber braking bushing off of the pullbar and set the chain so that it is tight once all the preload comes out of the pull bar? Im guessing this will work ok on a straight zlink swingarm car? Thanks for the info guys

Oh yeah, i was saying heavy in respect to you run both a pullbar and a torque arm, so it would add only a couple pounds.

Kromulous
Dirt Forum Champ
Total posts: 796
posted September 28, 2004 07:39 AM  
Would like to see that set up myself. Cant quite visualize the how the rubber bumper fits into the chain lift-bar.

sdracer12
Dirt Maniac

Total posts: 180
posted September 29, 2004 09:13 PM  
Yes you have it mostly right. We use the brake chain to set pinion angle at ride height, and then the rubber bumper in the top of the chain cushions the shock to the wheels when the torque arm comes down during braking. I think the main difference with this setup is "where and how" the braking forces are put into the chassis. The car just feels more stuck, without the lift feeling I was getting at the rear with the pullbar only.

You can get some preload on the pullbar with this setup, but not alot. We have found that the Afco linear-bearing pullbar moves much smoother than our last pullbar, allowing us to go to a 1050# spring when we needed a 900# before.

One other thing, we have the brake caliper mounts welded to the housing, no brake floaters. We found that the torque arm controlled the braking so well, we didn't want to float the brakes.

This car is a 4-bar/4-bar with sliders mounted on the birdcages, not clamped. This setup does add a little weight, but my car is chomemoly, so I need a little rear weight anyway, lol.

I'll try to get some pictures as soon as I can...


[This message has been edited by sdracer12 (edited September 29, 2004).]

Kromulous
Dirt Forum Champ
Total posts: 796
posted September 30, 2004 06:59 AM  
Thanks a bunch, sounds interesting.

MikeN
Dirt Full Roller

Total posts: 27
posted September 30, 2004 03:04 PM  
Ummm. I think I'm going to need 2 clues on this one.

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