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Author Topic:   setup help grt chassis
wildcat
Dirt Newbie

Total posts: 1
posted May 13, 2001 08:23 PM  
what is the basic setup on a grt chassis
on a 3/8 dirt 13-15 degree banking
for a four link car
please help ravis316@hotmail.com or wildcat@thedirtforum.com

jammin
Dirt Administrator

Total posts: 6243
posted May 14, 2001 10:32 AM  
This is the basic setup they have listed on their site...I think it is very generic and could use some tweeks. But they are trying to promote roll in the car with the springs they have listed here.

LATE MODEL SET-UP SHEET \ BASIC SET-UP

RIDE HEIGHTS:

LF: 3" Between top of lower control arm and bottom of frame
RF: 3" Between top of lower control arm and bottom of frame
LR: Set with the wedge
RR: 4-1/4" Between the top of lower frame rail and bottom of axle tube
( Newer cars that have dropped down underslung bar )
3"( Older cars with up sloping underslung bar )


SPRINGS:

LF: 500 lb. RF: 400 lb. LR: 275 lb. RR: 225 lb.



SHOCKS:
LF: 75 RF: 76 LR: 94 RR: 94



FRONT END ALIGNMENT:
Caster: LF: 2+ RF: 5+
Camber: LF: 1 3/4+ RF: 2-
Toe Out: 1/8" to 1/4"



TORQUE ARM SETTINGS:
73 Shock; 300 or 350 lb. Spring; 3" travel; preload 1/4" and check travel.
NOTE: 38" range usually performs best



REAR SUSPENSION:
Four bars should be run in the third hole up on the top bars and left lower should be in the upper hole and right lower should be in the lower hole.
Raise right upper bar up to help a push condition.
NOTE: Raising bars up usually promotes forward bite initially but will unhook car mid-straight away.
Set cars w/75 to 100 lbs. left rear on birdcage, clamp bracket optional for tight stop and go tracks.
NOTE: LR varies according to track variations.
NOTE: Birdcages usually keeps the car hooked longer


RECOMMENDED STARTING PERCENTAGES:
Left: 53% Rear: 53% Cross: 51%
NOTE: This is car w/15 gallons of fuel.
NOTE: Scale the car without the driver.



FOUR BAR LENGTHS FROM CENTER TO CENTER:
Left Upper: 17"
Right Upper: 17-1/2"
Left Lower: 15"
Right Lower: 15-1/2"

Panard bar should be 7 1/2 from bottom of frame rail to center line of bracket and third hole down on pinon. Center to center is 18 3/4". 18 3/4" on dry slick track.
NOTE: Lower panard bar on pinion for more side bite



COMMON SET-UP PROBLEMS:
Car tight: Soften front and stiffen rear
Car loose: Stiffen front and soften rear
NOTE: LR clamp bracket usually corrects a loose condition and requires a 25-lb. stiffer spring.
Shock rates are important in tuning a car and softer shocks will improve lap times on a smooth slick track.
Lap times improved by keeping car straight and using a smooth throttle application.
All these set-ups can only be justified wth proper maintenance and checking all suspension components on a regular basis.


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