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  #16 (permalink)  
Old 08-08-2003, 09:09 PM
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I sorta disagree with the statement about drag racing chassis and circle track being completely different. After all, roundy round is nothing more than two drag strips connected at each end. Both types of competitions try to do the same thing, race down the straights.

Heres what I have found:
Drive shaft torque in the counter clockwise rotation will want to pull up on the right rear because it attempts to take the whole axle with it. Even though the right rear is more loaded with weight the car, the car still want's to drive off the left rear causing the car to go right. How do you explain this? The axle will twist to the right side on launch, this loads the the right rear, the weight of the chassis will push the right rear down. You would think this would counteract the tendency to unevenly distribute the weight to one side or another but the key is, that with an open differential,(which circle trackers never use) the tire with the least amount of traction will get the most power, hence a 1/8 mile burnout. In this case your right, you would add a round of wedge or preload to the right rear to get the car to launch straight. However, the bags or screw jacks or whatever are intended to increase weight on the right rear to counteract the torque twisting of the drive shaft, assumes the rear end is located with some sort of leaf spring or coil over. But, if the rear is either a IRS or a four link, the transfer of weight doesn't happen the same. With a four link rear, the axle doesn't twist in the same direction as rotational torque of the drive shaft.

My knowledge was being applied to a different type of suspension. You can beat me if ya want

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Old 08-08-2003, 09:26 PM
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Try Original Parts Group part #2001610, no hop traction bars(just happened to have gotten the '03 monte/El camino OPG catalog the other day), have worked pretty well in past g-bod applications.... haven't tried in a monte yet, but they are great for El Camino's and they are a bit lighter in the ***** end, only cost $130 for the set too
dunno if this will cure the original problem but regardless it'll help you hook up better, as they cleared up wheel hop on my buddy's 87 el camino
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Old 08-08-2003, 10:39 PM
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I am not trying to fight with ya, I just like a good argument. Makes it interesting. I think from your previous post we are sortof on the same page now. I must admit circle track is not my gig. Seems to me the weight in of the cars in the corners would tend to load the right harder than in straight line. Plus we are talking dirt versus paved. Just a different world IMO.

As for 4 links they work exactly the same and axle torque is the same. This is what I was getting at on preload. Usually you turn the top right bar around 1/2 turn past where it starts to load up. This will actually raise the right side of the car and load the right tire. When the car launches the axle torque will level out the car and counter act the preloaded condition.

As for the coil setup that started this conversation......I have a friend who ran in the tens with a 80 malibu on stock suspension. He was running an air bag on the right side and a set of SSM lift bars. The car hooked really good on the street. The bag kept it level, and the lift bars really helped keep the *** end planted.

Chris
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Old 08-10-2003, 09:01 PM
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Race it, Don't rice it!
 
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I've always been the one to play the devils advocate my self. So don't worry, absoulutly no offense takes at all. I still learnig a lot about chassis myself. The typical dirt car will set the upper right bar front link slightly higher than the left to get the car to turn left better. I always thought that the bar would change the radai that the upper bird cage would index to, loosens the rear end. As it turn out, that just another way to preload the right rear and still maintain cross weight percentages. Does the same thing.
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Old 08-11-2003, 11:28 AM
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You guys should write a text manual or something.A friend of mine swears up and down that this wheel hop problem is coming from wore out body mounts.He thinks this is were the chassis flex is coming from.Do you think he has smoked to much funny stuff or what???
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