Measured at the wheels · Mossel Bay
Dyno results you can understand
We measure the same vehicle on the same wheel-power dyno before and after calibration, then explain the change in power delivery—not just one headline number.
Wheel power and engine power
They are different measurements
Manufacturers usually publish power measured or calculated at the engine. A chassis dyno measures the power that reaches the driven wheels after losses through the gearbox, transfer case, differentials, tyres and other driveline components.
Those losses are not one fixed percentage. They vary by transmission, tyre, temperature, operating condition and test method. That is why we do not apply a universal calculation and present it as exact engine power.
Our dyno is calibrated as a wheel-power measurement tool. Its value is a repeatable comparison: how this vehicle arrived, how it delivered power through the run, and how that same vehicle changed after the work.
How we use the dyno
Evidence throughout the calibration process
Record the vehicle as it arrives
A baseline shows current wheel power, torque delivery and how the vehicle behaves through the operating range.
Test under controlled load
The dyno lets us observe behaviour that is difficult or unsafe to assess consistently on a public road.
Refine the delivery
We look at the shape and consistency of the curve, not only the peak. Smooth torque and predictable response matter in everyday driving.
Verify and explain the result
The final run is compared with the baseline. We explain what changed, where it changed and what that means for the vehicle.
Why context stays with the result
A number only makes sense with its method
Dynos can use different measurement locations, correction methods, ramp rates, settings and environmental inputs. Two graphs from two machines may therefore show different numbers even when both operators are acting in good faith.
Publishing isolated figures without those conditions often creates more confusion than understanding. ATM uses its dyno to prove the change to the owner of the vehicle in front of us, under one consistent measurement method.
That approach keeps the conversation where it belongs: mechanical condition, usable delivery, repeatability and whether the finished vehicle meets the client's needs.
Questions clients ask
Clear measurement, without the maths fight
Why is my wheel-power figure lower than the brochure figure?
The brochure normally quotes engine power. Our chassis dyno measures what reaches the driven wheels after the vehicle's driveline losses, so the figures should not be compared as though they are the same measurement.
Can you convert wheel power to exact engine power?
Not exactly. Drivetrain loss is not one universal percentage. We can explain the relationship, but we do not present an estimated conversion as a directly measured engine figure.
Can I compare an ATM graph with a graph from another dyno?
Only with full context. Different machines, settings, correction methods and test conditions can change the displayed result. The most meaningful comparison is baseline versus final on the same system.
Do you provide a dyno result after calibration?
We show and explain the baseline and final wheel-power result at handover. The dyno is part of how we verify the work, rather than a separate marketing claim.
Start with the vehicle, not a promised number
Tell us the full specification and what you need it to do. We will explain the appropriate assessment, calibration and verification process.