Hi,

I see the brake has 4 individual brakes. To accurately measure this you need 4 individual load cells, which is not supported by YourDyno. 

You could assume all wheels have the same RPM (a good approximation in most cases) and then measure 1 brake and multiply with 4. It would be kind of correct, but it depends on how similar the brakes are and how accurate you want it to be. 

I definitely recommend a Telma brake over this setup! Mount it such that all rollers are interconnected (which a chain for example) so all rollers can be braked with one Telma.  Add a load cell to the Telma and a RPM sensor and you are good to go!

Cheers,
Jostein

Hi,

There is no limit to the hp the kit can measure. You just need to select the right size load cell.

Your brake will determine the max hp. Generally it will get bigger, hotter and more expensive the higher hp you go for. 

For your second question, do you mean to reduce the error from inertia of the rollers? This is generally not a big problem, if the rollers are fairly light. I see they have a small diameter which is good. Additionally you can always do a slower run. Slower run = less error. You can estimate the error using the attached file. 

excuse my not wisdom and obvious that I have to add up the weight of all four rollers?

the correction of error as is done?

Hi, yes you need to add all 4 rollers. In principle, you also need to add the inertia of the wheels and the rest of the drive train, even the flywheel of the engine. This total is very difficult to know. There is no automatic correction for this error. 

If your runs are fairly consistent in their run length, the error from run to run will be very small due to the inertia. 

prejudice to a further question as engine rpm are detected by your system?

Hi,

RPM is measured by a hall effect sensor. It senses any iron or steel material within 2mm of the sensor. You can simply use a bolt or two on the axle. Here is the sensor: http://www.newark.com/honeywell/1gt101dc/hall-effect-magnetic-sensor/dp/92F3009

Cheers,
Jostein