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This inertia type dynamometer is very popular, due to its affordability and repeatability. The weight of the rollers is calculated to accurately simulate road conditions and therefore lends itself to an ideal tuning tool for performance related dyno tuning.

Full load remapping can be done on the inertia dynamometer which has the advantage that it does a complete power and torque curve in less than 30 seconds. This reduces the dynamometer time dramatically and subsequently engine wear. Furthermore the engine does not overheat as easily as with the constant speed or loading dynamometers.

A loading facility (eddy current brake) can be added to the standard inertia dynamometer which enables the user to either put a fixed load on the brake or to hold the vehicle at a certain rpm, as well as perform a controlled sweep test (ramp test), where the speed is gradually increased while the power and sensor readings are recorded. This is especially handy when a problem is encountered at a specific rpm or load condition. Where applicable, the loading facility can also be used to do engine mapping.

A road simulation can also be done which accounts for: vehicle weight, acceleration, wind resistance and road inclination.

Up to 64 sensors (temperature, pressure, etc) can be added to this system, which may help the serious tuner in assessing problems. An integrated Air/Fuel ratio meter records real-time values that can be displayed graphically with the performance figures. This can be done for Loading and Inertia tests

The Air/Fuel ratio meter can be used as a stand-alone unit that can be used on the road or racing track.

The knurled rollers ensure good traction and limits unnecessary heat buildup in the tyres.

How a Dyno works

A dyno is equipped with large rollers, sunk into a pit. The car is driven onto the dyno, so that the drive wheels rest on the rollers. All Dyno’s differ with their outputs but they all work the same, so never compare different dyno out puts.
After the car is placed on the dyno, the car is strapped down so it cannot move forward or backwards.

A large fan is placed at the front of the car to cool the radiator and any other heat exchangers located there. The dyno tuner sits in the driver's seat and operates the accelerator, clutch gears.

The dyno tuner controls speed and other factors via a hand-held pendant that contains controls for load. We will normally only dyno a car in third, but any gear can be used.
The higher the gear the lower the tractive effort trying to pull the car of the dyno. Very powerful cars therefore sometimes tested in the higher gears, although third gear is most commonly used.
The car is held in a low rpm in a selected gear and then gives the engine maximum throttle. Flicking a switch allows the dyno to ramp up in speed.
As the engine rpm increases, the dyno’s software draws a trace on a PC screen, showing the power being developed, and any other info so that we can tune the car to its maximum potential.

Dyno Gallery