Mustang AWD-IMP-SE Chassis Dyno: What it is, and how it works:
So what sets the Mustang Dyno apart from other roller dynos? In one word: loading. The vehicle's
torque is transmitted through the rollers to the eddy-current Power Absorbing Units (PAUs). The PAUs
are mounted behind the rollers and are belted to the dyno's drive line. The PAUs are prevented from
"freely" rotating by the installation of a load cell. The "load" is measured by the load cell and is
transmitted to the control system via an electrical signal. The PAU absorbs this load by energizing
stationary electric field coils with a direct current. These coils establish magnetic fields through which
produce a force that is counter to the direction of the rotary motion. The power absorbed by the PAU
is dependent upon the amount of DC power applied to the field coils and the RPM of the spinning
rotors. The speed of rotation of the rotors is measured by a magnetic device called a mag pickup and
is transmitted to the control system.When both torque (from the load cell signal) and speed (from the
mag pickup signal) are known, horsepower can easily be determined (Source: Mustang Dyno). This
means that the dyno is able to load the vehicle as it would be loaded on the street without the use of
hydraulics, or guesswork. (Some other dyno manufacturers have even tried to copy this method).
Why would shops not exclusively buy Mustang Dynos if they are so great? Well, ultimately it comes
down to price. Usually the decision is made on the cheapest option, not the best. We've chosen the
best because that's what our customers deserve.
How does all of this tie into ECU (Engine Control Unit) calibration? If you have performance parts
installed on your vehicle and have a programmable ECU, or other EMS (Engine Management
System), then it is imperative that the ECU/EMS is calibrated properly with the correct load applied to
the drivetrain to ensure the most performance possible out of your combination. If you don't have
programmable engine management, check with us, there's a good chance that this technology is
available for your make and model vehicle.
Why not just street tune? Honestly, there is no good way to tune your setup on the street. We have
such things as traffic laws and speed limits.. Putting your car on the dyno will not only quantify your
performance gains, but will also allow proper calibration of ignition timing maps based on the torque
curve - this is the best way to tune ignition timing. It's best to make data-driven tuning decisions
rather than by the seat of the pants.
Ask anyone who has had their car tuned on a Mustang dyno how much they enjoy driving after a
proper tune and you'll be convinced that the best way to get a real world tune is on a Mustang Dyno.
Speed Industry, LLC
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