Home' Australian Automotive Aftermarket Magazine : Australian Automotive Aftermarket e-Zine - Perf 18 Contents These upgrades are often overlooked and seriously
underestimated in the eyes of many vehicle owners.
Sure, the car will be quick in a straight line, but
what about the suspension bushes and sway bars?
Surely the goal is to improve not only the
performance, but also the handling of the car.
Here, SuperPro shares some of their frequently
asked questions outlining what can be achieved by
utilising SuperPro products in a performance
Q. What do you recommend: first replace the front bushings
with polyurethane bushings, or, replace all of the rear axle
SuperPro: We don’t think of it in terms of front or
rear, more in terms of replacing the most critical
bushings in either the front or the rear. This is the
approach that we take in R & D. Replacing some
front bushings and not replacing any rear bushings
may lead to an experience that is less than ideal
from a performance handling perspective. SuperPro
bushings work better than rubber, it’s always best
to keep the car as balanced as possible.
Q. What effect can replacing bushings have and how
drastic is it?
SuperPro: The answer to this is that the handling
performance is dramatically improved. Reducing
unwanted movement in suspension arms is always
the goal. Soft and gooey rubber bushings are the
enemy of performance handling and lead to
excessive tyre wear. The whole philosophy of
SuperPro is to maintain optimal tyre contact with
the road, this is what delivers grip.
The biggest improvement comes, in most
applications, from the positive location of the
control arms during high speed cornering. SuperPro
bushings in these locations maintain dynamic
caster on any vehicle they are fitted to. Every
application we engineer bushings for will benefit
massively from a SuperPro upgrade. Our Caster
increase range of arms and bushings significantly
improve “turn in” feel and directional stability. The
result of installing the complete SuperPro package
results in a car that has lost the vagueness on
turning into corners and is far more predictable on
the limits of cornering. It is also noted that the car
will be firm but still smooth to drive and shows no
signs of harshness. So, whatever you drive, a
SuperPro upgrade will deliver discernible benefits
in handling and grip.
Q. As far as sway bars go, what amount of a performance
increase can you expect from a SuperPro Roll Control sway
bar versus OEM on a standard or lightly modified vehicle?
Is eliminating all body roll the goal?
SuperPro: Fitting larger diameter uprated sway
bars, particularly in the rear, have two main effects
vehicle balance in terms of understeer and
oversteer, and increased roll resistance. Both of
these can provide an increase in the overall grip
levels that can be achieved by the vehicle.
As most factory vehicles are biased towards
understeer, fitting a larger rear sway bar will help in
providing a more neutral characteristic in the
handling when on the limit. This is due to the
increase in roll stiffness at the rear, which loads
the rear wheels more unevenly and provides slightly
less grip at the rear than previous.
At first this may sound sacrificial; however, as the
rear end is resisting more of the roll, the front-end
resists less in proportion, leaving the front wheels
more evenly loaded, and therefore more available
front-end grip. In the end an increase in overall grip
can be achieved by balancing the vehicle. A WRX
or other front torque biased all-wheel drive vehicle
will benefit even more due to combined front end
Another effect of introducing larger rear bars is
that the roll stiffness is increased, and chassis roll
is reduced, this also reduces the effects of "roll
camber" . Roll camber is the variation in the
wheel/tyre camber setting due to chassis roll,
during cornering this usually results in the outside
wheels gaining positive camber. By increasing the
roll stiffness and reducing roll camber effect, the
wheel/tyre stays closer to its wheel alignment
setting or optimal setting. This can increase the
overall cornering grip available, as the wheel/tyre
does not lose as much negative camber at the
The balance and grip increase of the vehicle could
also be achieved by reducing the front sway bar
stiffness, however its roll stiffness would be
reduced and roll camber would suffer. This would
lead to large amounts of positive camber being
gained on the outside wheels/tyres when cornering.
This would result in a wheel/tyre that would not be
at its optimal camber setting at the limit of
handling. This could be remedied with large
amounts of static camber to counter act the
You’ve increased the power output, hopefully beefed up the brakes, fitted larger wheels
and tyres and maybe lowered it a bit. So, what’s next? A handling upgrade?
AAAM FEB 2018 - PERFORMANCE:AM MAGAZINE SHELL 6/2/18 11:27 AM Page 12
Links Archive Australian Automotive Aftermarket e-Zine - Nov 17 Australian Automotive Aftermarket e-Zine - Mar 18 Navigation Previous Page Next Page