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Check Out That
Chassis
By Jim Salemi
1/8/04
Jim,
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.
Thanks,
Tim
P.S. I race at Lancaster and I have seen your work. Very impressive!
Tim,
Thanks 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
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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 trial and error attempts.
Thanks Jim Salemi G-Force
Race Cars Inc.
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