A BRIEF HISTORY AND DISCLAIMERS |
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- FIRST DISCLAIMER
- I don't know what I'm talking about.
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- Both the fork and shocks can be dyno tested. In this description we are referencing a shock.
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- There are two different types of dyno tests. We refer to them as:
- Dyno Test only:
- The load cell records the compression and rebound force, displays a graph and spits out some force numbers.
- Pressure Test:
- Pressure sensors are added to the shock body, recording pressures in the three chambers.
- P.c is pressure in the compression chamber (comp).
- P.r is the pressure in the rebound chamber (reb).
- P.ca is pressure in the compression adjuster chamber (cadj).
- P.gas is pressure in the reservoir, which is the same as P.ca. Therefore we only record P.ca
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- After doing hands-on suspension for years, we finally got a dyno in 2006 and started running tests and documenting the results.
- We quickly learned that our hands-on experience was off. The test results were not what we expected.
- We thought we changed high speed, it affected low speed.
- We thought we targeted low speed and it had major impact on high speed.
- From 2006 - 2013 we ran Dyno Test only.
- Therefore, any documentation from 2006-2013 is limited to our experience with dyno only tests.
- From 2013 - present we run both Dyno Tests and Pressure Tests.
- Documentation from 2013-on is more precise and includes pressure test experience.
- Unfortunately, we learned that our hands-on dyno experience was lacking. We were making incorrect assumptions because we didn't have a breakdown of forces.
- Pressure testing breaks down the forces into:
- comp force from the main piston
- cadj force from the cadj piston
- gas force from the nitrogen charge
- drag force from the shaft seal, bushing and piston band.
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