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Check Out That
Chassis
By Jim Salemi
12/9/03
Jim,
I have a 66 Nova chassis four link car with
a wishbone and double adjustable Koni 7" stroke
shocks (no sway bars, no wheelie bars).The front
suspension is the old pinto
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cromemoly
a-arm with Koni Single adjustable shocks. The
thing has a 1.76 glide 4.56 gear and a 700 ft-lb
496" BBC. The corner weights are LF 687# RF
575# LR 685# RR 672#. The rear shocks have Carrea
95 lb springs. At ride height the, 14" LR spring
is compressed to 9-3/4" and the RR is compressed
to 10-1/16". The instant center is about 45"
out and 5" up. This thing currently has new
Goodyear 1480 Pro tree tires. I have changed
converters, tires, staging rpm, rear shock settings,
instant centers and burnouts. Leaving at 5000rpm,
the car will smash the rear side walls, the
rear of the car squats about 3", and it will
lift the front end about 2" (front wheels always
stay on the ground). It drives excellent, the
problem is that the thing will not 60' fast
enough and is very inconsistent in the 60' times.
Some examples are 8.99/153/1.341 (best), 9.11/151/1.384,
9.05/152/1.378, 9.16/152/1.408. These examples
were all recorded the same day. The engine and
transmission are in excellent working order.
Rear shock settings seem to have little or no
effect on 60' times. Need help! Thanks Glenn
Blanton
Glenn
Glenn,
Thanks for the question. Well
with looking at your corner weights and figuring
out your front to rear weight percentage, which
is 51% rear weight, we think a four link change
is in order for your car to work properly. Our
first concern is that you say your 4-link measurement
is AROUND 45 inches out and 5 inches up. Well
there are many critical adjustments made with
these numbers the must be done properly and
accurately. The four link must also be measured
from the center of the axle, not the bolt holes.
Also remember if the ride height changes it
affects the instant center measurement. With
those things in mind, to bring your 60 ft times
around we suggest a 50 inch instant center @
8 inches up. This will help weight transfer
problem and tighten up your 60 ft. times.
Thanks,
Jim Salemi
G-Force Race Cars
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