PASS - Penske Analysis Software Suite | Penske Racing shocks

What Is PASS?

PASS is Windows software that connects to a shock absorber dynamometer (shock dyno). It tells the dyno what test to run, captures the force and motion data the dyno measures, and turns that data into curves you can analyze, compare, store, and use to tune your dampers.

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Run your tests

Control your dyno, build test profiles, capture data, and review results in one connected workflow.

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Analyze your data

Open and compare files, manipulate curves, and pull insights from runs going back years. The graph is the focus.

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Predict your settings

Use machine learning to model your damper before you build it. Move points on the curve, get the shim stack and adjuster settings to match.

What Is a Shock Dyno and Why Do Race Teams Use One

A shock dyno, short for shock dynamometer, is a piece of test equipment that measures how a shock absorber performs. The dyno moves the shock through a controlled motion. Sensors capture how much force the shock produces against that motion. The result is a damper curve: a graph that shows force versus velocity or force versus displacement.

Damper curves tell engineers what a shock will actually do on the car. Race teams use shock dynos to validate builds, compare adjuster settings, develop new shock specifications, troubleshoot performance issues, and tune dampers for specific tracks, surfaces, and conditions. Without a shock dyno, damper tuning is guesswork.

Shock dyno software is what turns the raw output of the dyno into useful information. It controls the test. It records the data. It draws the graphs. It compares runs. It exports reports. PASS is that software.

Request Beta Access

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Race Team Damper Engineers

IndyCar, NASCAR, sports car, sprint car, and late model programs. Validate builds, compare runs, develop spec packages, tune between sessions.

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Shock Builders & Tuning Shops

Shops that build, revalve, and tune dampers. Dyno every shock that goes out the door. Store a complete run history for every client.

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Independent Racers

Drivers and teams who own their own shock dyno. Push-button predefined tests for common race series. No engineering degree required.

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Universities & OE Testing Labs

Motorsport engineering programs including Purdue University, and OE testing groups doing damper, elastomer, and component R&D.

A Modern Replacement for Shock 6 and Roehrig Software

Shock 6 has been the standard shock Dyno software in racing for the better part of twenty years. After MTS acquired Roehrig, development of the racing-side software effectively stopped. Penske Racing Shocks bought the remaining licenses, brought the original software author back in, and built PASS from the ground up to serve race teams again.

PASS keeps the engineering DNA of Roehrig. It opens existing Shock 6 files. It works with the Dyno hardware racers already own (with a hardware update for older units). And it does what the racing community has been asking for since the MTS transition: a modern, supported, actively developed shock Dyno software that race teams can rely on.

Shock7

Run shock dyno tests and capture damper data.

The Shock module is the dyno control side of PASS. Use it to build test profiles, run tests on your dyno, and capture the data those tests produce. Custom sine wave generation, predefined test templates for common race series, automatic hardware recognition on supported dynos, and a clean modern interface that replaces the Shock 6 control workflow.

Build custom shock dyno test profiles or run predefined templates by series

Generate custom sine waves across the relevant frequency range

Capture live force, velocity, and displacement data

Auto-detect compatible Penske and Roehrig Shock6 dyno hardware

Save runs directly into PASS for analysis

Built-in test validation and quality checks

DCML Module (Damper Curve Machine Learning)
Predict your damper curve before you build the shock.

DCML runs the math across hundreds of possible adjuster combinations and predicts the settings that get you closest to your target curve, before you ever put the shock on the dyno. Drag points on a graph, tell it what you're after, and it surfaces the top configurations.

✔Predict adjuster settings across hundreds of combinations

✔Model target curves before building hardware

✔Reference historical run data to refine predictions

✔Accurate to within 1-2% of dyno-measured results

✔Drag points on the target curve and watch adjuster settings update in real time

More Modules in Development

PASS is built to grow. Future modules will expand the platform into spring rating, curve libraries, and run history.

Penske PASS Software displayed on a device

Spring Module

The same approach as the Shock module, applied to spring rating equipment. Run your spring rater, capture data, store results in PASS alongside your shock data.

Spec Module

A library of pre-validated damper curves and build sheets, searchable by model, configuration, and performance characteristics. Drop pins on a target curve and Spec returns the closest match in the reference library, complete with the build sheet to recreate it.

Database Module

Store your own runs in a searchable, taggable database. Pull up any test you have ever saved by date, customer, vehicle, track, or any custom field. Free to use as a stand-alone storage tool. Paired with Spec for full search and filtering.

Penske PASS Demo displayed on two devices

Free PASS Demo for Anyone Who Wants to View Damper Files

PASS Demo Mode is free to download and free to use. Install it on any Windows machine. Open any PASS file or any existing Shock 6 file. View it, compare it against other runs, use every analysis tool the full version offers. The only things Demo Mode does not do are run a dyno and build a test.

Get Notified at Launch

Compatible Shock Dyno Hardware

PASS works with most Penske and Roehrig Shock6 shock dyno hardware from the last decade. New Penske dynos ship with PASS preinstalled. Older dynos in the field can typically upgrade with software only. Units older than that may need a hardware update to communicate with PASS. Send us your serial number and we will tell you exactly what your machine needs.

Compatible Hardware:

Current Penske Racing Shocks dyno line

Roehrig Dynos sold under the Penske Racing Shocks brand

Roehrig Dynos previously sold through MTS (with possible hardware update)

S-Link crank dyno (the original PRS crank dyno)

New PRS dyno line launching late 2026 (PRI release)

Penske PASS Demo displayed on two devices

Penske PASS Demo displayed on two devices

How PASS Licensing Works

PASS uses license keys instead of hardware dongles. Buy a license, get a key, activate the software on the machine where you use it. No more lost dongles. No more broken dongles. No more dongle troubleshooting.

Each license includes a one-year subscription that covers all software updates and new features. After year one, an annual maintenance fee keeps the updates flowing. If you skip the maintenance fee, your software keeps working. You just stop receiving updates and new features until you renew.

Multi-seat licensing is supported for race teams that need multiple engineers using PASS at the same time. Volume pricing is available for spec series, OE labs, and university programs.

Select a plan

Demo Mode

FREE / forever

Open any PASS file or existing Shock6 file
Compare runs side by side against your saved data
No dyno control, no test creation

Shock7

$2,500 / Primary license

Build custom shock dyno test profiles or run predefined templates by series
Generate custom sine waves across the relevant frequency range
Capture live force, velocity, and displacement data
Auto-detect compatible Penske and Roehrig Shock6 dyno hardware
Built-in test validation and quality checks
$750 yearly maintenance fee (future version free upgrade as long as maintenance fee is up to date)

DCML Module

$3,500 / Primary License

Predict adjuster settings across hundreds of combinations
Model target curves before building hardware
Reference historical run data to refine predictions
Accurate to within 1-2% of dyno-measured results
Drag points on the target curve and watch adjuster settings update in real time
$1500 additional licenses
$750 yearly maintenance fee (future version free upgrade as long as maintenance fee is up to date)

What is PASS shock dyno software?

PASS is the Penske Analysis Software Suite, a Windows-based platform for running shock dynos and analyzing damper data. It replaces Shock 6 with a modern interface and adds new tools including machine learning for predictive damper tuning.

Is PASS a replacement for Shock 6?

Yes. PASS is built by the original Roehrig software author and Penske Racing Shocks specifically to replace Shock 6 for racing applications.

Will PASS open my existing Shock 6 files?

Yes. PASS reads existing Shock 6 file formats so you do not lose any of your run history when you switch.

What dyno hardware does PASS work with?

PASS supports most Penske and Roehrig shock dyno hardware from the last decade. Older units may need a hardware update. Send us your serial number and we will confirm.

Do I still need a hardware dongle to run PASS?

No. PASS uses license keys tied to your account. Dongles are gone for good.

How does Demo Mode work?

Download PASS, enter a free license key, and you can open and analyze any PASS or Shock 6 file. Demo Mode does not run a dyno or build tests. Everything else works.

What does DCML do?

DCML (Damper Curve Machine Learning) predicts the piston, shim stack, and adjuster settings needed to produce a target damper curve. It saves the time of physically building and dynoing test shocks to find the right combination.

How accurate is DCML?

DCML predictions are typically accurate to within one to two percent of the measured curve.

Is PASS only useful for Penske dampers?

The Shock module works with any damper your dyno can test. DCML is most accurate on Penske dampers because the model is trained on Penske data. It can still be used as a reference tool for other brands.

How many seats does my license cover?

Each license covers one seat. Race teams can license additional seats at a reduced rate per additional engineer.

What happens if I do not renew my annual maintenance?

Your software keeps working. You stop receiving updates and new features until you renew. You can renew at any time.

When will Spring, Spec, and Database modules be available?

Spring, Spec, and Database modules are in development. Sign up for beta access and we will notify you as each module becomes available.

I am on an IndyCar team. How does the 2028 spec license work?

Each IndyCar team receives one PASS license at no charge as part of the 2028 spec shock program. Additional seats for team engineers are available at standard pricing. Contact us for IndyCar-specific licensing details.

How do I get support if I run into a problem?

Submit a support ticket through the PASS support page. Our team in North Carolina handles customer support and dyno integration.