Quote:
Originally Posted by CraigG.
Hey Guys - request help with traction and suspension tuning with 72 GTO.
Car launches straight, carries the wheels But now has a traction issue.
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
Front end limiters set to no limiting
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
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
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I would try a couple clicks in the rear shock maybe 3 and more negative
pinion angel. To make a real hard hit off the line move L-bar up one hole
iIn the front.I would try the first two sugestions first.
GT