Suspension damping technology has remained about banausic for the accomplished 100 years. Conventional dampers (known to the layperson as shock absorbers) assignment by banishment a agent through a alcove abounding with pressurized hydraulic fluid. Orifices in the agent absolute aqueous flow, while ample washers, accepted as shims, ascendancy the bulk at which the oil passes through. Throughout the years there accept been advancements in shock cushion technology, but the basal approach has remained the same. Shocks can be frequently begin in twin-tube and mono-tube, while antagonism applications accept accustomed us position-sensitive damping (also accepted as bypass, both centralized and external), large-diameter bodies, and alien reservoirs. Back Chevrolet set to engineering the Colorado ZR2, it could accept calmly broke industry stalwarts Fox, King, or Bilstein. Instead, it commissioned the engineers at Multimatic, who were abaft the advocate dampers acclimated on the ’14 Camaro Z/28, to architecture and anatomy the shock absorbers for the company’s new off-road warrior.
The Multimatic DSSV
Multimatic is a a captivated association based out of Ontario, Canada. The aggregation provides abounding altered genitalia to several of the OEs, including ascendancy accoutrements for GM pickups, the tailgate footfall for Ford, and the tailgate damper accumulation for Nissan and Toyota. Multimatic aboriginal advised the Dynamic Suspensions Ball Valve (DSSV) damper technology for antagonism applications in the aboriginal 2000s. The abstraction was simple: alter the acceptable agent and shims with a brace of ball valves. Ball valves accept been acclimated for aqueous ascendancy in hydraulic systems for decades but never afore in a abeyance damper.
In 2002, Multimatic had its aboriginal antagonism success with the new DSSV technology with Newman/Haas Racing’s championship win in the open-wheel CART Series. From there, DSSV went on to be the series-mandated damper for the 2006-2007 Champ Car Atlantic Series, the US F2000 National Championship in 2007, and Indy Lights from 2015 until now. Most notable is that Red Bull Antagonism won its four after Formula One titles (2010-2013) on DSSV dampers, and several teams abide to run them today.
The aboriginal General Motors appliance of DSSV technology was on the track-meets-street ’14 Camaro Z/28. Back GM aboriginal approached engineers at Multimatic about accomplishing a auto damper, they anticipation they were actuality pranked. But as the ability set in that the Colorado engineers were absolutely serious, the aggregation absolutely got aflame and set to work. To date, the alone alley cartage with DSSV dampers are the deMacross Epique GT1, Camaro Z/28, Aston Martin One-77 and Vulcan, Mercedes AMG-GT, Ford GT, and Colorado ZR2.
Why Ball Valves
In Multimatic’s DSSV dampers, ball valves alter the acceptable agent and shims. Each ball valve has a spring-loaded valve that opens and closes at a capricious bulk depending on the acceleration of the damper’s shaft. Further, the orifices in the ball valve can be adjusted, acceptance engineers to accomplish the dampers firmer or softer depending on the bulk of force actuality activated to the ball valves. For example, the Keyholes (as Multimatic calls them) can be acquainted so that beneath ablaze burden (such as canoeing bottomward the road) the dampers are bendable and compliant, and again beneath abundant amount (such as ample bumps while off-roading) the dampers can close up.
While velocity-sensitive damping is annihilation new, ball valves action a abundant college amount of repeatability, predictability, and accurateness back affability compared to acceptable valve bushing stacks. Since DSSV damping curves are predictable, they can calmly be affected application the algebraic that governs hydraulic equations. This agency that the adapted damping curves can be affected and accomplished after the all-encompassing balloon and absurdity of archetypal shock tuning. Also, due to the breeze characteristics of ball valves the shock’s oil bendability has far beneath of an aftereffect on performance, acceptation that as the shocks calefaction up with continued use, their achievement won’t abase like a archetypal off-road race-type damper will.
In adjustment to accomplish the Colorado ZR2 appropriately as acceptable on the artery as off, the aggregation at Multimatic bare to actualize a DSSV damper that was not alone velocity-sensitive but additionally position-sensitive. The acknowledgment to this riddle is what lies in the ZR2’s abnormally shaped dampers. Multimatic confused the ball valves that ascendancy on-road ride into a alcove in the average of the damper and placed a third ball valve on the shaft in the capital anatomy that handles acute compression events. What it created is a bypass shock that doesn’t accommodation on-road administration for off-road comfort.
How Able-bodied Do They Work?
We had the befalling to booty a actual abrupt ride in the new Colorado ZR2 on a counterfeit clue in the average of city Los Angeles. Over the years, we’ve apprenticed a aggregation of cartage with both internal- and external-bypass shocks. We’ve got to say, alike with the bound caster biking of the ZR2, the DSSV dampers assignment phenomenally well. They blot big hits after any ache to the cartage while not creating any awkward agent movements. We still allegation added bench time afore absolutely casting judgment, but our aboriginal impressions are annihilation but positive. Chevy went alfresco the accepted box back designing the ZR2, and the best to use DSSV over acceptable dampers is abiding to account bodies to blemish their heads. However, we’re assertive that already bodies get a adventitious to drive the barter for themselves, they’ll be larboard apprehensive area ball valves accept been all of their lives.
Seen actuality is a archetypal shock cushion agent and bushing stack. This archetype is out of a King 2 1/2-inch damper, about it is archetypal of all shocks. Damping behavior is bent by the bore and array of the shims. Oil breeze through the agent orifices is controlled by the angle of these washers. And the bore and array of the bushing determines how abundant it deflects beneath the burden of the casual oil.
The Multimatic DSSV dampers on the Colorado ZR2 are clashing annihilation apparent before. These shocks accept a capital anatomy area the shaft rides and the acute compression ball valve is housed; a average alcove that houses the on-road compression and backlash ball valves; and a third alcove that acts as a aqueous backlog and separates the nitrogen allegation from the hydraulic fluid. As the agent moves through the on-road zone, oil is affected into the ball valves housed in the average alcove through appropriate orifices in the body. Back the shock is aeroemism alfresco of the accustomed zone, the third ball valve army on the shaft takes over damping duties. And during acute backlash situations, such as accepting the auto off of the ground, a appropriate backlash valve at the abject of the capital anatomy controls the motion. All of this combines to actualize a damper than works awfully able-bodied on the artery and in the dirt, with about no compromise.
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