A Ladder Bar Hole Tuning/Adjustment - Page 2

CraigG · 11-08-2022, 12:46 PM

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 · 11-08-2022, 02:07 PM

Try tightening the pull a part on rear shocks.

CraigG · 11-24-2022, 03:07 PM

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

Mike Gray · 11-25-2022, 12:41 AM

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 · 11-25-2022, 08:12 AM

What is the left and right rear wheel weight?

11-08-2022, 12:46 PM	#11
CraigG Junior Member Join Date: May 2007 Location: Iowa Posts: 23 Likes: 0 Liked 3 Times in 2 Posts	Re: A Ladder Bar Hole Tuning/Adjustment 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

11-08-2022, 02:07 PM	#12
Ralph A Powell Member Join Date: Oct 2017 Location: Bay City Texas Posts: 357 Likes: 1 Liked 202 Times in 123 Posts	Re: A Ladder Bar Hole Tuning/Adjustment Try tightening the pull a part on rear shocks.

11-24-2022, 03:07 PM	#13
CraigG Junior Member Join Date: May 2007 Location: Iowa Posts: 23 Likes: 0 Liked 3 Times in 2 Posts	Re: A Ladder Bar Hole Tuning/Adjustment Happy Thanksgiving to all you guys and appreciate all your support and technical help. Take care, Craig

11-25-2022, 12:41 AM	#14
Mike Gray Senior Member Join Date: Oct 2006 Posts: 519 Likes: 222 Liked 498 Times in 134 Posts	Re: A Ladder Bar Hole Tuning/Adjustment 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. __________________ Mike 7570 A/SA

11-25-2022, 08:12 AM	#15
SGSST109E Member Join Date: Jun 2007 Location: NJ Posts: 342 Likes: 54 Liked 124 Times in 58 Posts	Re: A Ladder Bar Hole Tuning/Adjustment What is the left and right rear wheel weight?