I am building a
corvette roadster for bracket racing.
I am new to setting up 4-links. Could
you please give me a starting place for
where to put the instant center? It will
be for brackets only, so consistent RT
and ET are more critical than quickness.
The car should weigh approximately 2100
lbs. with 50% rear wt. It has struts on
the front with 225 lb. springs (per Strange
rec.), 110 lb. springs on the rear. I
am running a 421 ci. small block with
a glide, 4.88 rear gears, probably 1.76
first gear. Could you give me some direction
as to shock settings, etc. I need all
the help I can get.
P.S. I race at Lancaster
and I have seen your work. Very impressive!
for the question. Everything you are doing
seems to be right in line with the way
we would approach a project like yours.
There are a couple of critical points
of information that I need but I'll do
my best. Those points are if the car will
have a throttle stop and what brand shocks
are on the car. Without knowing the rear
shock brand it is hard to suggest a setting
with each brand having different valving
and adjustment settings. With the rear
weight @ 50% and a throttle stop in use
set the 4-Link in the high fifties to
low sixties in the area of ten inches
up. That will jerk the front wheels out
of the beam quickly for a good reaction
time. Pay attention to wheelie bar height
as to not unload the tire and cause tire
spin. If the car does not have a throttle
stop move the intersection point to mid
forties to low fifties at seven to nine
inches up. This is a better setting for
a full on power setting (no throttle stop).
It keeps the car balanced and smooth through
the first part of the run. Also make sure
the wheelie bar controls the car and does
not upset the overall performance of the
car. Engine location is very critical
to the actions and adjustment of the chassis.
So these suggestions and measurements
might need a few trial and error attempts.
Thanks Jim Salemi
G-Force Race Cars Inc.