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Introducing the Dynapack chassis dynamometer:
Thank you for your interest in our products! The Dynapack is a truly revolutionary machine. In the following
pages, we will attempt to answer all of the most commonly asked questions we receive, while at the same
time, provide some technical insight on the way we achieve the results we do. There are some very important
differences between our products and others in the marketplace. We have no interest in making disparaging
comments about our competitors, but we do feel that it is important to make sure that these differences are
explained clearly in order to demonstrate the full potential of our products. Dynapack chassis dynamometers
are such a radical departure from the stereotypical roller dyno that it really is in a class of it’s own. Most of
the previously developed assumptions about chassis dynamometers (the roller type) simply do not apply to
the Dynapack series. In fact, you will discover that we give you tools and capabilities that were previously
thought to be impossible to achieve on a chassis dyno.
How does the Dynapack work?
The theory of operation and the implementation of that theory is actually fairly simple. It took several years
and a lot of hard work however to make our dyno as simple as it is today. The hubs of the vehicle are directly
attached to hydraulic pumps. We can apply a variable but precise load with all of the potential holding power
that hydraulics possess. Simultaneously, we are monitoring pressures and measuring hub RPM, so we can
determine the amount of work being performed. It sounds easy until you realize that all of these
calculations are very complex and are happening very quickly. Add to this, all of the data logging functions and real-time
full-color graphics that are also being calculated and you begin to realize that what
appears to be simple is actually very complex. Being the best is never easy. Traditionally, most serious engine builders have thought
that chassis dynamometers were inferior to the results you could obtain from a quality engine dyno. We have
effectively attached engine dyno style load cells to the axles, so we now have the type of precision and
repeatability normally associated with an engine dyno, but with the convenience and benefit of having the
engine operate in its natural environment - which has enabled many of our customers to see better results
than they were getting on their engine dyno.
Because we need a precise and powerful loading device, we use hydraulics. We do not use inertia (more on
that later), we do not use eddy currents, air, or friction. Because of the incredible holding power hydraulics
offer, we have TOTAL control of the axle speed. Literally. Want to hold a steady RPM under high power?
We can hold an exact axle RPM (+/- one RPM) at any power level - all the way up to the full maximum rated
torque capacity of the dyno, CONTINUOUSLY - for as long as you like. If the software allowed it, we could
stop the engine within one revolution of the axle - even if the engine is at full throttle at its maximum torque
level. Obviously you would not want to do this, and our software prevents it, but it does give you an idea of
just how much power we have over the axle speed. Our dyno controls the car - not the other way around. We
control the axle speed and rate of acceleration at all times. Because we aren’t limited by the capabilities of
eddy current brakes and similar devices, we open up a whole new world of tuning possibilities. Times change
and technology evolves. What was once “industry standard” is now yesterday’s technology. The Dynapack
is truly the most technologically advanced chassis dynamometer in the world - at any price.
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