DSSVDamping

Technology

EngineeringSERVICES

Multimatic combines expert engineering, research anddevelopment with manufacturing excellence to deliverworld class suspension systems and components

Engineering Services Group• Full service design, engineering, analysis, prototyping and testing• Vehicle and suspension engineering, development and testing• Contract services to corporate divisions, automotive OEM's and suppliers

Hinge Systems Group• Full service supplier of complete vehicle closure hardware systems• Door, hood, trunk, liftgate/decklid and sliding hinge systems• Closure checking, assist and power devices

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integrated vehicle sub-systems• Complex stamped and welded assemblies and modules

Suspension Systems Group• Full service supplier of suspension components and sub-systems

Closed-Loop Vehicle Dynamics Optimization

Dynamic Suspensions is the premier brand of performance damper systems fromMultimatic - a global leader in the engineering, development and manufacture ofautomotive suspension systems and components. Major OEMs and leadingmotorsports teams rely on Multimatic for the supply of a full suite of developmentservices and innovative products.

Headquartered in Markham near Toronto, Ontario, Canada - Multimatic suppliescomponents, systems and services to the global automotive industry and has operatingdivisions in North America and Europe - with partners in Asia, South America andAustralia.

Multimatic specialize in the manufacture of stampings, welded assemblies, mechanisms,and suspension components, as well as the design and development of automotive bodyand chassis systems and its competitive edge has been gained by applying advancedtechnologies to achieve outstanding product quality, delivery and functional performance.

The four operating groups of Multimatic have generated a high profile list ofinternational repeat customers due to a proven track record of consistently meeting itsclients’ engineering, development and product needs.

Multimatic combines expert engineering, research anddevelopment with manufacturing excellence to deliverworld class suspension systems and components.

Strength throughtechnology®

Full-service suspension systemsupplier

DSSV Damping TechnologyDynamic Suspensions’ new DSSV damper can giveyou a competitive advantage due to a newdamping technology that has previously only beenavailable through exclusive arrangements.

DSSV provides significant performance andoperational gains over conventional dampers andeliminates the use of shims commonly used inmotorsports dampers.

DSSV Damping Technology offers:

• Analytically determinant. The DSSV damper is virtually a pure damper.Through the use of Spec Finder™, the damper will duplicate the behaviour ofa theoretical damper model enabling consistent results with ADAMS orother vehicle dynamics simulation software. This feature is the subject of apatent application.

• A wide range of damping curves. The nature of the DSSV valve providesthe widest possible range of F-V curve options - from digressive to linear toprogressive. Shim and poppet valve dampers are limited to combinations ofv2/3 and v2 relationships. With DSSV, the shape of the curve is only limitedby the laws of physics.

• Independent control of high and low speed damping. The low speeddamping adjustment is via a unique digital bleed valve. This feature is the subject of a patent application. The valve has predetermined discreet adjustment steps for consistent adjustment across the range, and between

dampers. High speed damping control is through the DSSV valve which runs in parallel with its own adjuster mechanism.

• Temperature stability. Oil flow within the DSSV damper is kept highlyturbulent which contributes to a very low level of damping “fade” at hightemperature. Typical force degradation from 30°C to 120°C is less than 4%over a typical range of velocities as compared to up to 16% for a shimdamper, or up to 14% for a poppet valve system (particularly at lowervelocities).

• Frequency independent. The DSSV valving design's low inertia and stictionhas produced a damper with consistent damping over the complete rangeof frequencies experienced by race car suspensions.

• Cavitation-proof. While most dampers rely on a minimum reservoircharge pressure to prevent damper oil cavitation below a threshold velocity(or at least a balance between piston and CV valving), DSSV dampers are

designed in such a way that cavitation is impossible regardless of velocity or valve specification. This feature is the subject of a patent application.

• Minimal sensitivity to displacement. The very low gas charge valuesrequired in DSSV dampers means that ride height changes are minimized as a function of temperature variation.

• Repeatability and consistencies. DSSV dampers are consistently repeatableto less than 2% or 15N damping force variation across the velocity range,and throughout the adjustment range. This consistency significantlyreduces the amount of time spent working with dampers to get the correctspec and range of adjustment.

• Minimal damping hysteresis. Much work has been done in thedevelopment of the DSSV product to minimize damper hysteresis,optimizing the trade off between damper size and hysteresis level.

DSSV is an aluminium-bodied coil-over damper covering a wide range ofinstalled lengths and damper strokes. It is configured for 2.00” and 2.25”(50mm and 57mm) springs with an option for 36mm (Formula 3) springs.

Adjustment via the replacement of the high speedcatridges can be made without having to fully strip, re-build and bleed the damper.

It is a pure 4-way damper featuring independent high and low speed valvesfor control of both bump and rebound, and includes linear indexed adjusters,matched from damper to damper to optimize the symmetry rating across each axle.

The desired damping specification is selected using Dynamic Suspensions’SpecFinder™ software. Fine-tuning is achieved through on-car adjustment ofboth the linear indexed high and low speed adjusters (adjustment range of 0 – 11 on each adjuster).

The external, cartridge-based configuration of the valves means they can bereplaced on the damper quickly and without the need to fully disassemble, re-build and bleed the damper.

The high speed valve adjusts, in even steps, the ‘blow-off’ point on the damper’sforce vs. velocity (F-V) curve.

The selection of available high speed valve assemblies provides a wide range of F-V curve options – from digressive to linear to progressive.

The DSSV range includes remote and in-line reservoir variants, with anoption for piggy back reservoir coil-over dampers and McPherson struts.

Multimatic’s well-equipped lab can conduct testsranging from base material properties testing tocomponent/system life durability testing.

Engineering servicesSpecFinder™Dynamic Suspensions' SpecFinder™ software is a fully predictivedamper model, based on the governing hydraulic equations.

It is not simply a database. It is effectively a software representationof the hardware used to construct the DSSV damper. By selecting theappropriate cartridges from the available valve library, you canvisualize the resultant F-V characteristics of the damper.

Drop-down menus allow you to select both the High Speed DSSVvalves for bump and rebound, as well as the actual on-car adjustersettings for all 4-off valves.

You can scan through the adjusters via the menus, or select the'sweep' facility.

This allows you to visualize the full range of on-car adjustments,enabling you to gauge the available range for adjustment from thecurrent setting. This is true for both the high and low speed valves, in both bump and rebound.

SpecFinder™ includes advanced graph-control features, allowing youto zoom into user-defined areas (specific velocity ranges), to look inmore detail at the F-V characteristics.

SpecFinder™ integrates not only with Dynamic SuspensionsDynosoft™ damper dyno software, but can also transfer data to andfrom MS Excel, using the 'Copy and Paste' feature.

SpecFinder™ features:

• Damping force prediction. Due to the analytically determinant nature ofthe dampers, SpecFinder™ accurately predicts the F-V characteristic acrossthe velocity and frequency range and at all adjuster settings.

• User-friendly. SpecFinder™ is well proven in a number of applications, it iseasy to determine what valve or adjustment changes are required to matchan existing damper curve.

• Integrated. It also interacts with Dynamic Suspension's Dynosoft™software to either download a reference damper curve or upload actualdamper results to match.

• Target damper F-V characteristics can be imported into SpecFinder™from MS Excel simply by using the “copy and paste” feature. The resultantF-V curve can then be easily exported back into Excel, or another suitableapplication, directly from SpecFinder™.

Multimatic’s advanced engineering services can be supplied either individually or as part of an integrated support program and may include: • Iterative package development in co-operation with your team’s chassis/suspension

design function. This can include advanced CAE, FEA services at component andvehicle level.

• Simulation support using ADAMS (suspension system and vehicle level), RaceSim or other vehicle dynamics simulation software including integration of SpecFinder™software.

• Testing support using our proprietary 4-post testing, acquisition and analysis methods.• Component testing utilizing our range of test facilities. • Damper technician and race engineering support at test and race events.

SpecFinder™ is effectively a software damper dyno, eliminating the needfor extensive dyno testing and effectively saving both time and trouble. It is as convenient as simply working at your laptop/computer.

Additional products and services can include:

• Simulation Support: Optimization and Sensitivity Studies. - Use of either quasi-static or dynamic scenarios.- Design of Experiments (DOE) and Multi-Objective optimizations to determineresponse surfaces: Evaluate sensitivities to race tunable settings and detailed analysisof specific event (e.g. corner or chicane).- Integrated suite of programs, industry standard and proprietary, brought togetherto provide an effective Track Side Tool for the race engineer.

• Multi-post rig testing. This is a cornerstone of Multimatic's vehicle dynamicsdevelopment philosophy. Since our rigs are specifically designed and built tocharacterize and optimize the cars dynamic response to road inputs, Multimatic iswell suited to maximize the setup of your car.

• Dynamic Suspensions damper dynos. Our range of both mechanical (sine wavetesting) and hydraulic (composite waveform and track data replay testing) damperdynamometers are key ingredients in the success achieved by many race teams, roadcar manufacturers and tier 1 suppliers in suspension development and optimization.

With multi-post test rigs in Europe and North America, Multimatic services bothOEMs and the motorsports community with state-of-the-art facilities, proprietarytechniques and software.

Driven to success

DSSV Damping Technology provides:

• A large reduction (75%) in temperature sensitivityover conventional dampers.

• Elimination of damper cavitation (allowing reducedgas charge pressure).

• Pure damping characteristic up to at least 20Hz (a frequency independent damper).

• Identical architecture for both bump and rebound -providing any deseried damper chacteristic andadjustment.

• Low friction, due to low gas charge and traditionallow friction sealing systems inherent in DynamicSuspensions dampers.

The fiercely competitive worlds of Formula One, CART, IRL IndyCar Series, Formula 3 and international sportscarracing have been the laboratory for the high speed research and development of the new and uniqueDynamic Suspensions Spool Valve (DSSV) Damping Technology.

After taking victories in each of these categories and winning the 2002 and 2004 Champ Car World Series and2004 British Formula 3 Championship, DSSV Damping Technology is now available for your application.

DSSV is more than just a damper - it is a complete program which incorporates hardware, software andengineering services. The DSSV damper program includes the acclaimed SpecFinder™ software which enablesyou to analytically develop and precisely match the desired damping characteristic, providing consistency,enhancing performance and simplifying adjustments.

DSSV provides pure damping characteristics, eliminates cavitation and significantly minimizes temperaturesensitivity in a modular design which is suited to an extensive variety of motorsport applications.

DSSV Success:

• 2004 Champ Car World Serieschampion, Sebastien Bourdais,Newman Haas Racing

• 2002 Champ Car World Serieschampion, Cristiano da Matta,Newman Haas Racing

• 2004 British Formula 3 champion,Nelson Piquet Jr.

• 2003 Rolex 24 at Daytona, Daytona Prototype class winner

• 2003 IRL IndyCar Series race winner,Alex Barron, Mo Nunn Racing

• 2002 ALMS, Panoz Motor Sport,winner, Grand Prix of Washington D.C.

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UNITED KINGDOM / EUROPEMultimatic Technical Centre Europe 20 Fison WayThetford, Norfolk IP24 1HJ EnglandPhone: (44) (0) 1842-755744 Fax: (44) (0) 1842-752626E-Mail: dssv_uk@multimatic.com

www.multimatic.comwww.dynamicsuspensions.com

NORTH AMERICAMultimatic Technical Centre85 Valleywood DriveMarkham, OntarioL3R 5E5 CanadaPhone: (905) 470-0025 Fax: (905) 470-9579E-Mail: dssv_na@multimatic.com

For DSSV product information or product support, contact:

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