Street Sus­pen­sion

RC Car Action - - TECH CENTER -

I drive my short-course truck mostly on the street. How can I make it harder to flip over? If I take a cor­ner any faster than about half throt­tle, it usu­ally flips and re­ally tears up the body.

As you’ve dis­cov­ered, the soft, long-travel sus­pen­sion that helps your truck in off-road con­di­tions is a li­a­bil­ity when you’ve got a lot of trac­tion—and there’s no higher trac­tion than a set of tall, soft off-road truck tires on pave­ment. Thank­fully, there are easy ad­just­ments you can make that will al­low you to cor­ner at higher speeds with­out a rollover. Be­gin by mov­ing the shocks far­ther out on the sus­pen­sion arms and shock tower, if there are ex­tra holes to work with. This re­duces the arms’ lever­age on the shocks, mak­ing the sus­pen­sion ef­fec­tively stiffer. This will re­duce chas­sis roll, so the truck is not as quick to trans­fer weight to the out­side wheels when cor­ner­ing. Next, in­crease spring preload by adding a spacer above the shock spring (or by thread­ing the col­lar down the shock body, de­pend­ing on your truck’s setup). About 3 to 5mm should do the trick—the goal is to re­move some of the sus­pen­sion’s sag, not jack it up.

Those are the easy ad­just­ments; if you don’t mind a lit­tle more wrench­ing, you can put spac­ers in­side the shocks to re­duce their travel and lower the truck. If sway­bars are of­fered for your truck (check your man­ual), these will also re­duce the ten­dency to trac­tion-roll.

Adding a sway­bar (high­lighted in green) will help the chas­sis stay flat­ter while cor­ner­ing and re­duce trac­tion rolling.

In­stall a spacer to re­duce sus­pen­sion sag, but don’t overdo it—a 3 to 5mm spacer is plenty.

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