Car Tuning Working as a team is one of the most important factors in finding success at a track like West Plains. "Our baseline setup will pretty well get a guy started at West Plains, and he can start there and be competitive right off the sheet," says Garrison. "The track is a bit of a challenge because the fine-tuning comes in. The driver's experience is helpful. It needs to be combined to help get around that racetrack. It takes skill and chassis setup combined because it's so slick."
Like most chassis builders, Garrison shares his knowledge with customers to help them succeed. For a track like West Plains, the dry slick setup baseline is the starting point. Track time enhances the basics to get the car to its most competitive end.
GRT Late Model Dry Slick Setup
Springs-LF 550#/RF 375#/LR 250#/RR 225#(Sixth coil cars-400# on end of torque arm, keep sixth coil straight up).
Shocks-LF 75/RF 76 (75 for flat slick)/LR 93/RR 94
Torque ARM Settings-
73 shock, 350# spring, 3-inchtravel, preload 11/44-inch and check travel. (32-inch range usually performs best).
LF-3 inches between top of lower control arm and bottom of frameRF-3 inches between top of lower control arm and bottom of frameLR-Set with the wedge in the carRR-411/44 inches between top of the lower framerail and the bottom of the axle tube (newer cars that have dropped-down underslung bar)Three inches between top of lower framerail and bottom of axle tube (older cars that have up-sloping underslung bar).
Bite-150# to 200# of LR bite
Running Spring Behind Left Rear-Run spring behind the axle on all track conditions except rubbered-up or extremely tacky. Run dummy shock with spring behind and real shock on front on semi-slick to traction track conditions. (Note: This setup will calm the movement of the car. This is not a cure for erratic movements.)
Panhard Bars-Standard Panhard to use-1911/42-inch J-bar (center-to-center). Panhard bar should be mounted 9 inches from the bottom of the framerail to the bottom of the slider bracket and in the second notch on the right side of the pinion mount. Optional Panhard bars-Long J-bar (2411/42 to 2431/44 inches)-Bottom hole on pinion and 9 inches to bottom of bracket on frame. (This position and Panhard bar style is good on most track conditions, especially when the track is rubbered-up or tacky. Straight Left Side Panhard Bar-(1711/44 to 1711/42 inches)-Second hole on pinion from bottom and 8 inches from bottom of frame to bottom of bracket. (This bar works well on smoother, flat, slick track conditions. It creates side bite and forward bite. This bar also will cause the car to be more erratic and difficult to drive. Do not use on a tacky track.)
Birdcage Brackets with Multiple Holes-Moving left upper four-bar to lower hole will help create more instant forward traction and should be done on smooth tracks only. Moving shorter left upper four-bar to forward hole creates even more instant traction, but is more radical and should be used in extremely smooth track conditions.
Common Setup Problems- Car too loose on entry and tight when you pick up the throttle? Try a pair of 250# springs on the rear. For smoother, flatter tracks go to a 350# spring on the RF.