A Ladder Bar Hole Tuning/Adjustment

[Dragsinger]

All the above comments are valid.

In my experience with engines in the 700-horse range and cars in the 3000-pound range, a 2 or 3-degree down angle works well. And as stated above, the down angle is in relation to the body, not the ground.

If you want the ultimate set of tools. Build yourself a set of stands or tables about 30" high. Set up the car, at ride height, driver weight in the seat, and rear wheels removed.
This offers an excellent view of your setup plus allows easy adjustments.

Beyond this, a drive-on rack is perfect but few of us have those.

[CraigG]

72 GTO.

Car launches straight, carries the wheels But now has a traction issue:
Initial hit and spins recovers 10 feet out with loss of .08 to .1 at 60 foot with 3500 launch on 2 step on 5000 convertor

New best with a 6.41 at 105.5 and later spun at 106.

That was an improvement of over 4 mph when I ran a 6.58 at 101.8 from a carb tune, slight port match and a change from 3.73's to 4.11.

Still launching at 3,500 - 2-step with 5,000 still to grab.
Turbo 400 4.11 Pro gears with MT 10.5w x 28 slicks

Front suspension:
QA1 Pro Coil Double Adjustable GM coil over conversion system with 350 # springs
Adjusted to 90/10 settings
Low friction control arm bushings and ball joints
Total Race Weight 3440
Front weight 1860
Rear weight 1580
Percentage Basis Front to rear 55% to 45%

Rear suspension:
Full length Competition engineering adjustable ladder bars
Bottom hole lowest front heim end setting
Right bar - slight preload
“5 #150 (?) lbs - springs with spring jacks
Stock Mount: 28 year old Koni single adjustable set at 1 turn tight from lightest setting=Issue(?)
Pinion angle 2 degrees negative
MT 10.5w x 28 slicks with tubes at 14 pds cold - best runs

Thanks Guys, Craig

[Ralph A Powell]

Try tightening the pull a part on rear shocks.

[CraigG]

Happy Thanksgiving to all you guys and appreciate all your support and technical help.
Take care, Craig

[Mike Gray]

Check your Koni shocks. After about 5 or 6 years and my car started acting up on launch. I found one of the Koni shocks was almost froze up. These were single adjustable and no setting adjustment would help. I ordered new Aftco double adjustable and the car came back with consistency and better 60’ times.

[SGSST109E]

What is the left and right rear wheel weight?