Originally Posted by Mike Pearson (Post 546334)

Just don't move the bars past level with the bottom of the rocker panel. Mine has a down angle of 1-2 degrees. Horsepower and good chassis is what will make the car get up in the front. Moving the bar down will make it hit the tire harder.

Originally Posted by b.guggenmos (Post 546377)

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.

Originally Posted by joespanova (Post 546371)

I have had the car VERY wheel stand prone in the past..........to the point of damaging stuff.
Since I lowered the ride height in the rear it wont..........so to recover ( some ) I either move the bars or lower the housing on the perches.....I dont want to raise the azz end up a hole on the perches , sooo.........past level?
I'm already slightly down a degree or so............so I either go down more:confused: or up 1 hole as has been suggested.
The consequence of breaking parallel , at least from going DOWN some is already noted. The result of going UP is not.

Originally Posted by Mike Pearson (Post 546411)

I can tell you from experience with my car that if the bottom of the ladder bar is running on an upward angle in comparison to the frame of the car it will not hook the tires. A slight downward angle has always been better on my car. 3150 Lbs. and it will 60 ft in the 1.28 - 1.29 range when the air is good. This is with a PG.

Originally Posted by joespanova (Post 546371)

I have had the car VERY wheel stand prone in the past..........to the point of damaging stuff.
Since I lowered the ride height in the rear it wont..........so to recover ( some ) I either move the bars or lower the housing on the perches.....I dont want to raise the azz end up a hole on the perches , sooo.........past level?
I'm already slightly down a degree or so............so I either go down more:confused: or up 1 hole as has been suggested.
The consequence of breaking parallel , at least from going DOWN some is already noted. The result of going UP is not.

Originally Posted by Tom Broome (Post 546443)

I'll try to keep this short.
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.

Originally Posted by Tom Broome (Post 546443)

I'll try to keep this short.
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.

Originally Posted by joespanova (Post 546459)

Nothing has changed except the ride height in the rear..........IIRC.
Mark seems to know you................?