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09-28-2017, 10:22 PM | #11 |
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Re: Ladder bar leaf spring guys
I have been racing a ladder bar leaf spring car for a very long time and admit I struggle with them. I bought Tim Morgans Doorslammers The Chassis book many years ago and have always thought moving the bars up hits the tire harder not down as stated in the book? So I just did a search and talk about information overload! Total opposite diagrams from different vendors for hits tire harder by raising or lowering the front of the bar. No wonder people are confused. I am! I don't post here often but read a lot. Thanks and hopefully some of this will help the person that started the thread.
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09-29-2017, 06:00 AM | #12 | |
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Re: Ladder bar leaf spring guys
Quote:
Trial and error............ |
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09-29-2017, 07:08 AM | #13 |
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Re: Ladder bar leaf spring guys
[QUOTE=b.guggenmos;546274]Not necessarily. That depends on where he is at now? Raising the bar moves the instant center rearward and higher and hits the tire harder. That may or may not make it try to wheel stand more?
This is good information. The higher into the chassis the front of the bar goes, the more tire hit, because you're getting less "leverage" against the chassis. The result of that loss of leverage is that the tire is driven into the track harder. The other side of the equation is that when the front attaching point of the bar is lowered, the car still may not wheelstand a great deal, because it simply may not have enough power to "lift" the chassis. |
09-29-2017, 08:53 AM | #14 | |
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Re: Ladder bar leaf spring guys
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Mike Pearson 2485 SS |
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09-29-2017, 10:59 AM | #15 | |
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Re: Ladder bar leaf spring guys
Quote:
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09-29-2017, 01:48 PM | #16 | |
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Re: Ladder bar leaf spring guys
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You lowered your car and it doesn't wheelstand as much. When the center of gravity is lower in relation to the rear axle the car will not transfer weight as easily. Did you lower the front at the same time? I expect the solution can be found in the front suspension. How much travel? How much stored energy? What is your front spring rate? I'm assuming your car is still a stick. Have you made any clutch changes? How hard does it hit the tires on the starting line? Do the tires slip or dead hook? Does the rear suspension squat, or lift? Raising or lowering the center of rotation (ladder bar eye) primarily affects the reaction of force applied to the rear tires. Lengthening the center of rotation affects the point of lift in relation to the longitudinal center of gravity, not an option for your ladder bars. |
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09-29-2017, 02:08 PM | #17 | |
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Re: Ladder bar leaf spring guys
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09-29-2017, 06:09 PM | #18 | |
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Re: Ladder bar leaf spring guys
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Mark seems to know you................? |
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09-29-2017, 06:36 PM | #19 |
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Re: Ladder bar leaf spring guys
No, I don't, but he seems to know something about chassis (plural) and suspensions
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09-29-2017, 08:35 PM | #20 |
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Re: Ladder bar leaf spring guys
On my 68 Camaro the front of the ladder bars are angled downward, it always leaves with the wheels up. The 66 Nova I used to own had the front of the bars angled up when I first bought it and it had no adjustments. I had a guy weld new brackets on it and angled the front of the bars downward. The first race with it like that it broke 1 rear shock and cracked both upper shock mounts. I was always under the impression that with them angled downward it would leave harder. I do know that front and rear ride height can really effect weight transfer.
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