have seen a lot of threads on the bulliton boards from
racers asking how to set up an Antiroll Bar (ARB) so I
thought I would add a quick setup procedure.
This procedure starts
where everything is already welded in and all you need to
do is install the downlinks.
If you have coilovers then before setting up the ARB make
sure the car is level side-to-side using the coilovers to
adjust the cars stance at race weight. When the driver
sits in the car the car will lean to the drivers side so
use the coilovers on that side of the car if possible to
get the car level. Yes, the springs on the drivers side
will be adjusted higher than the passenger side. This is
1. Get the car to race weight: Proper air in the tires,
N2O bottles filled, Fuel, Driver, etc. You want the
suspension loaded just as it would be as if you were on
the starting line ready for the green light. If you can
crawl under the car and make these adjustments while the
car is on the ground then this is perfect. If not then
place evenly height blocks under all four tires so that
you can crawl under it.
WARNING: Make sure the car is properly setting on the
blocks so it can not move or roll off.
2. With the car at race weight install the Driver Side
downlink making sure that the link is short enough so
that it does not hit the floor board when going over
bumps. Tighten the bolts and jam nuts for this downlink
you are done with this side.
3. Install the Passenger Side downlink so that the bolts
just slide in the rod ends easily. This is 0 preload.
Tighten the bolts and jam nuts for this downlink you are
done with the entire setup.
Adding preload to the suspension using the ARB involves
lengthening or shortening one of the downlinks and is
usually done with the Passenger downlink. Adding preload
can correct a car if it does not launch straight and I
prefer not to add any preload unless necessary. Some
people prefer to add 1/2 turn making the passenger
downlink longer "just in case" but I do not
like preload unless I know it is needed.
Lengthening the Passenger downlink will turn the car
Shortening the Passenger downlink will turn the car
You can also achieve the same results by adjusting the
Shortening the Driver side downlink will turn the car
Lengthening the Driver side downlink adds preload and
will steer the car right.
When adding preload only turn the downlink 1/4 to 1/2
turn at a time. Do not go more than 1/2 turn until you
test it. A half turn of preload can do a lot so do not go
over board on this adjustment.
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