Ride Control: 2012-MY20 Isuzu Dmax and Holden Colorado BP-51 Suspension

In July of 2016, General Motors and Isuzu announced that they were ending their decades-old
collaboration and would not be jointly developing their next-generation Utes, the Holden Colorado
and Isuzu D-MAX. After a friendly parting of ways, Holden gave the Colorado a major upgrade in 2017,
introducing new steering, updates to the chassis and transmission, and refreshed styling.

Because of the changes between both vehicles, a careful suspension design and development
process was required to ensure vehicle-specific ride and handling was achieved for each ute.

D-MAX DEVELOPMENT
Lead OME Engineer Stuart Fooks explains the process for developing the BP-51 shocks for the D-MAX.
“We developed a new spring, specific to the D-MAX. When engineering this suspension package, and in
comparison to other vehicle-specific designs, it’s a fairly simple and clean set-up with no big
surprises.”

The remote reservoir chamber easily mounted above the strut tower in the front of the vehicle;
however, the rear shocks were a little more tricky. “One of the first things we had to look at when
developing the rears was the distribution of the travel,” says Stuart. “The D-MAX had enough
compression but not an ideal amount of droop. To solve this problem, we’ve added a couple of
spacers for use with the thinner, lighter leaf spring designs, which has allowed us to get some
extended compressed length into the shocks and more droop.”

Increasing this length into the shock helps with ride comfort for the driver as well as keeping the
wheel on the ground. For heavier rated springs, the pack is a lot thicker and the spacers used for
the lighter springs are not required.

A BP-51 suspension package is now available for the Isuzu D-MAX 2012-2019 models. Contact your
local ARB store or stockist for part numbers and pricing.

COLORADO CONTROL
After engineering a suspension package for the D-MAX, the OME engineers set their sights on its
former brother from another mother, the Holden Colorado. Josh Harris,
OME Engineer, explains, “One of the main differences immediately noticed in the front of the
Colorado is in the wheel arch; it has a small, laser-cut, folded piece of steel mounted at the
top. When mounting the remote reservoir chamber above the strut tower, we wanted to make sure it
didn’t hit that OE obstruction. After fitting the front BPs, we conducted a full range of motion
checks on the shock and we’re very happy with the mounting and location of that remote reservoir.”

When moving to the rear of the vehicle, the left-hand side of the Colorado has an identical set-up
to the D-MAX, with the shock mounted to the rear of the axle. However, the right-hand side requires
the shock to be mounted in front of the axle, meaning the remote reservoir as is cannot be mounted
on the back side of the shock like the left. Speaking to Josh, who was still developing the BPs,
explains, “We can’t use the same hose so we have two options: either make a bracket to mount the
remote reservoir to the chassis or, for style points, we are hoping to be able to connect the
right-hand side shock with a shorter hose. This will not only allow us to mount to the back of the
shock but also, from an aesthetic point of view, will keep all the suspension looking nice and
symmetrical across both sides of the rear.”

A BP-51 suspension package is now available for the Holden Colorado 2012 on and we can confirm that
Josh’s preferred final design was implemented with a piggyback mount of the remote reservoir to the
shock on both sides of the rear. Contact your local ARB store or
stockist for part numbers and pricing.