Q&A Forum
I've been trying to set MOI on my converted Dyno. The label on this dyno states "Base inertia weight: 2000lbs inertia" can this be used to calculate anything? The load cell that came with this dyno is a 200kg cell so I'm reusing it. This dyno I want to use for ATV's and UTV's I strapped a UTV (RZR) to set up the MOI with wizard but found out I couldn't use that since CVT does not disengage so it can coast. I took that off and strapped an ATV. noticed rollers are a bit heavy for the ATV but managed to complete the wizard. Once completed I see that I have total MOI of 1.88 for roller1 and 1.87 for roller2. I pressed save and close. Do I have to enter that number anywhere else? If i go to OPTIONS/Brake Dyno w/Load cells, Load cell 1 still says MOI 10.00 kg*m^2 and load cell 2 says 0.60 kg*m^2. Did that have to change at all?
Hi,
Do you have two loadcells in this setup? If it is a 2WD chassis dyno, you should normally only have 1 load cell. In that case, turn off Load cell 2 and set RPM2 to be Not used.
On the MOI:
Total MOI = Roller/Hub MOI (from Options) + Drive Train MOI (from MOI Wizard or manually measured)
The idea is that the Roller/Hub MOI is static, it is the dyno MOI, but the drive train MOI varies with the vehicle. It is the total that matters though.
After measuring the MOI, you need to click Use results then Save.
I recommend doing a manual MOI test if you can first. You do that for example with a RPM Ramp up then Ramp down, and adjust the MOI so the results match.
Thanks for the quick reply. I'll turn one off I just figured I had 2 brakes and 2 load cells that I wire and calibrate 2. I'm new to the dyno world and learning as I build mine.
This dyno is 2wd but is split. So 2 rollers brake and cell for each side. It's width is adjustable.