The double spring right rear uses a 10” x 100 lbs. inner spring with a 12” x 150 lbs. barrel outer spring. This package provides more forward bite and side bite than a standard 250 lb. spring or 225 lb. with spring rubbers. This unit will provide the same entry rate as a single spring but will have a softer exit rate. The right rear dual springs provide more pressure pushing the tire into the race track. This is achieved by pre-loading the 100 lb. inner spring so pressure is applied even on extension as the car is driving off the corner.
This is designed for dry slick only, middle to bottom of the race track. It will make the chassis tight if the right rear tire hits the cushion. The slicker the track the better this works.
Example of standard right rear versus double spring:
Right rear shock Travel 225 lbs. spring + Double spring
center to center 1 rubber (250 lbs. rate) 100 lbs. + 150 lbs.
21-1/2” 1-1/2” extended 25 lbs. load 224 lbs. load
21” ______1” extended 150 lbs. load _ ____280 lbs. load
20” ride height 400 lbs. load 400 lbs. load
19” 1” compression 650 lbs. load 650 lbs. load
18” 2” compression 900 lbs. load _900 lbs. load