Q&A Forum
hello
i have done some research and alot of info i have found in the web but just want to be sure i'm right
to build a hub dyno what are the parts that are needed when with building frames to hold the retarders.
* 2 eddy current retarders
* 2 sport devices power supply's to control each retarder
* YourDyno instrumentation kit
so the sportdevices power supply's can be connected to the retarders and the powersupply tot the yourdyno instrumentation kit to control the retarders so the everything can me controlled and logged with the software and the kit for "YourDyno instrumentation kit"
so apart from having the the right and in good condition retarders and building a good frame to support the retarders, a laptop or PC, and engine controls like starting stopping system and throttle control.
did i miss something?
so if a retarder can be found in good condition and bought for €2000,- each this could be done for around €5000,- to €6000,- am i right?
Regards, Johan
Hi, that's right!
Cheers,
Jostein
oke
am I right when I take for example on each wheel a retarder that can hold max torque 2000nm . is it then a dyno that can read out power to 2000nm? and is the power pushing on the load cell or is in pulling on the load does it matter how you install it because there is put weight on top to calibrate it
Hi, no, you need to include the gear ratio from the engine to the wheels, in other words the gear box plus the differential. There is a gear ratio options window where this can be calculated for you. The engine typically spins faster than the wheels, so torque at the engine is lower than the torque at the wheels (divide by the gear ratio). When you have two retarders, obviously you have doubled the torque your system can hold.
The load cell works in both push and pull direction. But as you say you need a way to calibrate it, which is normally done by placing a known load on top of it. But you could also place a load on the opposite side or you could press from below with a known force, that works too. You can also place the load at a different distance from the center than where the load cell is placed. In that case you enter the calibration distance instead of the distance to the load cell in the calibration window.
Hi, no, you need to include the gear ratio from the engine to the wheels, in other words the gear box plus the differential. There is a gear ratio options window where this can be calculated for you. The engine typically spins faster than the wheels, so torque at the engine is lower than the torque at the wheels (divide by the gear ratio). When you have two retarders, obviously you have doubled the torque your system can hold.
The load cell works in both push and pull direction. But as you say you need a way to calibrate it, which is normally done by placing a known load on top of it. But you could also place a load on the opposite side or you could press from below with a known force, that works too. You can also place the load at a different distance from the center than where the load cell is placed. In that case you enter the calibration distance instead of the distance to the load cell in the calibration window.
yes offcourse i mean 2000nm to the wheels should be possible with the retarder spec
oke thanks i will have a look how the best way is build it then
Hi, no, you need to include the gear ratio from the engine to the wheels, in other words the gear box plus the differential. There is a gear ratio options window where this can be calculated for you. The engine typically spins faster than the wheels, so torque at the engine is lower than the torque at the wheels (divide by the gear ratio). When you have two retarders, obviously you have doubled the torque your system can hold.
The load cell works in both push and pull direction. But as you say you need a way to calibrate it, which is normally done by placing a known load on top of it. But you could also place a load on the opposite side or you could press from below with a known force, that works too. You can also place the load at a different distance from the center than where the load cell is placed. In that case you enter the calibration distance instead of the distance to the load cell in the calibration window.
yes offcourse i mean 2000nm to the wheels should be possible with the retarder spec
oke thanks i will have a look how the best way is build it then