Rear Suspension Flashcards
In a 4-Link drag car, the starting point for the rear end should be 1/2” to the left of the center line to help launch the car straight.
False/ In a drag car, the rear end should be centered.
Which type(s) of lateral locator would you find on a ladder bar drag car? Diagonal link or Wishbone
both
In what type of vehicle would you find a jacob’s ladder lateral location device?
Non-wing sprint car
Tristan and Randy are discussing 3 link suspension tuning. Tristan says lowering the front mounting point of a pull bar will increase traction on acceleration. Randy says lowering the front mounting point of a pull bar will decrease traction on acceleration. Who is correct?
Tristan only
Andy says wrap up occurs during deceleration. Dave says wrap down occurs during acceleration. Who is correct?
Neither Andy or Dave are correct/ Wrap up = acceleration / Wrap down = deceleration
Lonnie says that asphalt cars have the panhard bar mounted to the frame rail on the right. Paul says that dirt cars have the panhard bar mounted on the frame rail on the left. Who is correct?
Both Lonnie and Paul are correct
Billy says that a Watt’s link lateral locator is used on a road race car because they allow the rear end to move straight up and down.
True
What is the proper orientation for a birdcage on a 4 bar dirt modified?
6 o clock & 12 o clock
In what type of race car would you find a birdcage being used?
Dirt 4 bar late model
What is loose roll steer on a race car?
Rear end pointed towards the outside of the track
What is tight roll steer on a race car?
Rear end pointed to the inside of the track
Which tire contact patches should be lined up on a dirt car modified?
Left side
What component(s) should be used with a drag car using ladder bars with leaf springs?
Axle cages
What causes a race car to roll steer?
Angles of the trailing arms as viewed from the side
Unequal length trailing arms
On a 4 link drag car, changing the bottom bar angles has no effect on the instant center or the launch of the race car.
False/ Changing the bottom bar angles DO have an effect on the instant center and the launch of the race car.
Brandon and Greg are discussing 4 link drag cars in class. Brandon says that instant centers that fall below the neutral line will cause the rear of the car to squat. Greg says that instant centers that are above the neutral line will cause the rear of the car to squat. Who is correct?
Brandon only
On a leaf spring car, what devices can be added to improve acceleration traction?
CalTracs
Traction bars
Pinion snubber
What angle should an axle damper shock be mounted on a race car?
Uphill toward the front
Which drag car rear suspension offers the most tune ability?
4 link
Mike and Dave are discussing 3 link suspension tuning. Mike says lowering the front mounting point of a pull bar will loosen the race car on corner entry. Dave says lowering the front mounting point of a pull bar will tighten the race car on corner exit. Who is correct?
Both Mike and Dave are correct
Changing the height of the instant center off the race track on a 4 link drag car will have no effect at 60’ line.
False/ Changing the height of the instant center can effect initial launch, 60’ times, and the ability to keep traction down the race track.
A J-Bar and panhard bar are two completely different components.
False/ The J-Bar and panhard bar are the same component. The J-bar is shaped like a J for pinion clearance but is still considered a panhard bar.
The recommended starting point for the bottom bar on a 4 link drag car is level.
True
Changing the height of the panhard bar will affect the pinion angle.
False/ Changing the height of the panhard bar will effect the roll center height.
A Watt’s link is preferred to a panhard bar on road race car because the panhard bar moves in an arc causing the rear end to shift back and forth.
True
