The fear of the unknown is human natures, and the Dyno is no exception. There are two types of automotive dynamometer;
- The engine Dyno: (The engine Dyno tests engines that are removed from the car, Dyno test engines that are removed from the car)
- The chassis Dyno: The vehicle is strapped down, the entire Driveline spins the machine’s rollers
Different Dyno designs:
There are different types of Dyno designs out there. Some work with water brake and a torque arm to calculate torque. Others work with electric current (eddy current) to calculate torque. Still others use mathematic calculations to measure the acceleration of a known mass and get horsepower and torque from there.
When the torque at every single RPM point is noted, the Dyno’s computer can calculate its horsepower number. This info is displayed on a workstation screen, and printouts can be taken with just a click.
Every design has its advantages and disadvantages, the chassis Dyno has turned into much more public among the overall population for the simple fact that the engine doesn’t have to be detached for testing. In fact, the truth is: A chassis dyno technique is one of the simplest and least expensive methods to put the finishing touches on a tune-up.
It is very important to perform the steps in the right sequence. When people got satisfied with the Dyno, they start to practice another phenomenon: they plan to go directly on the Dyno. The best practice for the proper Dyno sessions is to save them as a last in the tuning sessions and the diagnostics.
- Initiate with making sure the engine and Driveline are in good condition.
- The drive wheels will be moving with high speeds while on the Dyno, so everything involved should be closely inspected. From suspension, brakes, u joints to the tires every part should need to be in proper shape.
- Then entirely tune the engine. Finally, make a plan for the trip to the Dyno shop, and prepare the tools and supplies that would be needed for the plan execution.
After getting tuned and prepared, it’s time to experience the rollers.
It’s a good practice to arrive at the Dyno shop 20 mins earlier than the appointment time. Inform someone from the staff that you are there so that the tools and your car can be prepared for the session.
When the operator is ready explains the plan so that he can determine the number of pulls needed. Next, you will be advised to get your car on the rollers. Many shops have the rollers in-ground. Just do exactly as instructed. In some places the shop staff will do this for you. Next step is to slowly move the wheels on the rollers to check blocks and straps the final time.
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Now when the car is properly hooked, it’s good to go. The process usually goes as follow, but it always a good practice to follow the operator’s instructions:
- Start moving the car in first gear to start the rollers spinning.
- Accelerate to the next gears needed for the pulls, usually third.
- Come to the desired point of RPM to start data collection.
- On the signal of the operator fully press the accelerator.
- Get to the target point of RPM normally which is near redline. Disengage the clutch, sometimes you will be asked to turn off the engine.
- Don’t ever use your car breaks and let the Dyno use its own brakes to lower the speed of the wheels.
- Step out of the car and now you can have the results on the monitor.
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