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Post by dee61 on Aug 15, 2014 12:01:47 GMT -6
i have a 68 chevy pick up i race on a qtr mile semi banked track. when i enter the turn in the middle or higher the right front bounces bottoming out throwing off my exit of the turn. now i have a 1150# spring on right front and 1125 on left front. its an old asphalt truck so still had those springs in it. now if i went softer would that help on the damping or not? thanks for any advice im kinda stuck truck is 3400 pounds.
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Post by flipflopoo1oo on Aug 15, 2014 12:38:11 GMT -6
You need a stronger rt. ft. if bottoming out! 1300 rt ft on our heavy nova car kicked ass for years! A 200 split stronger right holds left rear and noses less! A 25 split stronger left holds the cross to provide lt. rear and switches to right lifting or rolling for side bite! Ck your shocks! Firm left and soft right with heavier numbers for weight! 2 points variation, no split valves needed! Even on the rears! You are going to like the change. preload the lt ft by 200 pounds more than right with driver! Lean it left a inch first! A too light of rebound on the left rear allows it to get there too soon and throw the load of roll hard all the way through if slowing or hiking the left rear! My shock package and splits are not to be played with as to other ills being created once mated to the total and location of percentages! A little lead on the left rear my help if lifting during the nosing process or when on the throttle to get off the corner, minimize roll by increasing left, or even to hold left drag to steer left going in off the throttle and nosing not to mention being able to get in the throttle sooner and without added steer to upset a smooth turn in the process! Just battery and fuel weight location is key as to having to add less and have more! The adjustments out ways the lead every time if well placed to do the most good! Slide the motor to the left any you can would help or just match springs to the weight of the ft!
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Deleted
Deleted Member
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Post by Deleted on Aug 16, 2014 23:24:45 GMT -6
Damping is all about shocks, not springs. What shocks are you running and when was the last time you checked them?
Dave.
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Post by dee61 on Aug 17, 2014 18:35:15 GMT -6
after looking at it the right side was just bouncing not bottoming out. i pulled shocks today to see what number they were come to find out they were just a truck shock . i now have a 75 lf 74 rf.
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Post by flipflopoo1oo on Aug 17, 2014 18:56:18 GMT -6
If it persist, test for slack in idler arm or toe of Ackerman in bump-steer causing a waddle if not steering enough on the rear! Too low of air sometimes lets it roll under and bind and release if not enough positive camber in the nosed and rolled position!
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Post by confused on Aug 20, 2014 18:47:16 GMT -6
If you can, try a 4c-6r shock for the RF. It may need more rebound than what I suggested. Rebound is what keeps them from bouncing by slowing the upward movement.
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Post by dee61 on Aug 22, 2014 11:31:11 GMT -6
thanks for all ur responses. its going on the scales sunday to see were its at there then next saturday we will see how it went. thanks guys
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Post by flipflopoo1oo on Aug 28, 2014 21:51:53 GMT -6
Did you get rained out too? I have also have noticed that too soft of a spring getting too close to coil bind in the preload has a rampant effect of rapid poundage change causing a frenzy when squashed too close to its binding point! If un-loading left rear in the cross switching sides it has little to hold it from the domino effect on all four wheel pounds changing to bounce mode! Having to change stiffness of a shock package is not my best fix in timing weight transfer elsewhere! A total weight and then just the ft axle weight will help in finding both spring and shock combinations that work with your percentages! Nosing hard ups the pounds tremendously in the corner with a truck's roll weight and momentum if braking! I hope new shocks fixed the problem at hand!
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Post by dee61 on Sept 17, 2014 20:08:10 GMT -6
an update. i put a softer spring on both fronts new shocks all the way around. Went out next race no more bounce but a loud thumping. got to really scratching my head found the left rear spring had sagged down over a half inch . it was hitting frame against rear end. new rear springs had our last race saturday won my first championship... thanks for all the help!!
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Post by flipflopoo1oo on Sept 18, 2014 13:03:41 GMT -6
Great to here and con-grads!
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Post by confused on Sept 22, 2014 5:50:13 GMT -6
Congrats on the championship and glad we could be helpful.
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