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Author Topic:   rough track
dirttrackcowboy
Dirt Roller

Total posts: 6
posted June 25, 2000 01:40 PM
What does a guy do to combat a really rough track? The one we raced on this weekend was like a plowed field. We were told that lower the panhard and making it level would help alot. Any other suggestions?

jammin
Dirt Administrator

Total posts: 3279
posted June 25, 2000 01:54 PM UIN: 16262997
How would a lowered panhard bar combat a rough track??? I am curious how this would make a difference.

[This message has been edited by jammin (edited 06-25-2000).]

jammin
Dirt Administrator

Total posts: 3279
posted June 25, 2000 02:00 PM UIN: 16262997
Generally, what I do to make the car a little smoother is lighten up the spring and shock combo's just a little, makes the car a little smoother and easier to handle.

dirttrackcowboy
Dirt Roller

Total posts: 6
posted June 25, 2000 02:11 PM
What we were told about the panhard was that, lowering it and making it level causes the car to not roll over so much.

According to AFCO, you are suppose to stiffen the springs and shocks so you don't get the wheels popping off the track so bad.

Dirt Man
unregistered Total posts: 6
posted June 25, 2000 07:56 PM
Cowboy, You are correct! When the track becomes very rough you want to slow down the reaction of the tires, so you would stiffen the shock package as to keep the tires on the track longer. I would however leave the spring package alone but raise the whole car up about 1/2".
Good Luck.......

jammin
Dirt Administrator

Total posts: 3279
posted June 25, 2000 09:53 PM UIN: 16262997
lowering the panhard bar will actually cause the car to roll more, not less.

dirttrackcowboy
Dirt Roller

Total posts: 6
posted June 29, 2000 07:51 PM
Doesn't lowering the panhard lower your roll center thus, making the car roll less?

jammin
Dirt Administrator

Total posts: 3279
posted June 29, 2000 08:25 PM UIN: 16262997
When a track is super, super rough (I have raced several like this in Arky) I would allow my suspension to basically float over the roughness by lightening the suspension. Your traction will be affected, but when you can drive smooth, it will make up for that. If you add spring/shock to this situation, you will literally beat yourself to death in the car. I did have one instance of that. Screw in ball joints fell out of the car.

As far as the panhard, on our cars, when we lower the panhard, it allows the springs to react with up and down motion, what many guys forget about, is when the panhard is at an angle, it also loads similar to what a spring, it basically redirects the load. The steeper (if chassis mounted on the left rear) it is, the more weight that is distributed to the left rear, thus actually putting more weight there, with the steeper angles, it will tend to give you more RR bite, but it also not allow the weight to transfer as much, keeping the weight more on the left rear. This is just something that we have worked with and have learned about our cars over the years. I thought I would share it. Hope it helps someone.

dirttrackcowboy
Dirt Roller

Total posts: 6
posted June 29, 2000 08:30 PM
we're going back to the same track friday and are going to give your suggestions a try, thanks for the info.

Mike Stout
Dirt Full Roller

Total posts: 56
posted July 12, 2000 11:34 PM
dirttrackcowboy, Did you go back to the rough track?

Mike Stout

Roll Steer
Dirt Roller

Total posts: 14
posted July 14, 2000 12:02 PM
A comment on the panhard bar: There are two different ways to "lower" the panhard bar.

(1) If you lower the panhard bar on both ends (pinion and frame), you have lowered the rear roll center. A lower roll center (using the same spring rates) will create more body roll.

(2) If you lower the panhard bar on the pinion OR the frame--but not both--you have changed the angle of the bar. This does not drastically affect the rear roll center.

These two different changes cause different end results.

Roll Steer

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