Q&A Forum
Hello everyone, I am very new, and looking for some much needed help. I recently just bought an older dynojet motorcycle dyno, I believe it is a dynojet 100. All I have is the dyno itself, the rpm sensor on the drum is their, and the other box (brains I guess) is also their the wires, starter etc... All but the software!! I am thinking since this stuff is such old tech anyway I would be so much better off buying one of these "your dyno" systems, BUT what I don't understand and don't know how to do is get that system to read my drum correctly? I really only know what I have been learning from spending hours reading about stuff on the Internet, but I really still don't understand.
please any help at all to get me up and running would be great and much appreciated .
Thanks
Rob
Hi there!
This can easily be upgraded with YourDyno. I need a bit more info about your system to know exactly what you need. Is it inertia or a braked dyno?
To read the drum (RPM) you need an RPM sensor. It may be possible to reuse the one you have depending on the type, but I a new one is only about $70. In addition you need a trigger wheel, unless you have one already. See https://yourdyno.com/YourDynoHelp/brake-rpm-sensors/ . 20-30 teeth is normally a good size. If you have a inertia dyno, that's all you need!
You can post some pics and/or add some more questions and we can help you get going.
The dyno is an inertia dyno. It has a Sensor and pick up, BUT I have found another post with a guy who has same dyno as me and he could NOT use his original sensor? This post was from 2018 tho, so maybe this has changed? I will try and send a picture of what I have.
Picture? Maybe file size is too big? But it is a dynojet 100I
You can reuse it if it is a hall effect sensor, but not if it is a magnetic (VR) sensor, which it very well might be. If you prefer you can use the VR sensor, but then you need a converter board, this one: http://www.jbperf.com/dual_VR/v2_1.html (5V version). It converts the VR signal into a 0-5V signal, which is what YourDyno needs.
This is a better picture of sensor.
Your kit comes with new sensor anyway? This way I can use it and have new wheel made? This is likely the easier option ? This sensor on my dyno is from the 90's. This dyno has never been updated since bought new in the 90's.
What about calabrating the barrel with your system? Is this as hard as it sounded when I read the story on this forum about the other guy who did what I want to do back in 2018? It seemed like he had a tough time getting things to read properly?
Oh, that RPM sensor is not going to be usable, or at least not the trigger wheel. It does not have enough teeth. The sensor itself may be ok, it may be a hall sensor or an optical sensor. You can potentially just replace the trigger wheel, but once you are down that path I would rather change the sensor too.
The way to calibrate an inertia dyno is to take a bike with a known power level and adjust the Moment of Inertia until it matches. Pretty simple, but you need a reference dyno pull. Alternatively you can take a stock bike and adjust until you get the manufacturere's spec, but it is more accurate if you use data from a dyno pull.
Ahh ok, I understand this I believe. The more time I spend reading about this and watching videos, the more I begin to understand.
Yes I believe it is best to have new wheel made and use supplied sensor also.
I don't know if I understand what the load cell is? And if this is something I require when I make my order?
I will order the rpm sensor you have listed .
Load cell is only for brake type dyno? Not needed for inertia type of dyno?
Load cell is only for brake dynos, for inertia you just need an RPM sensor.
I recieved my yourdyno unit today, wow I am so surprised how small the unit is, very amazing, I could swear they looked bigger in the you tube videos I watched? The purchase of this unit was so very easy, shipped out rite away and in my hands here in Canada in 5 days!
I am currently waiting for my new trigger wheel to be made, but once that arrives I will try and keep this updated with my progress, as I have 0 experience with this stuff, and I am totally relying on the information I have been finding, more information for the next guy the better.
I received the pick up wheel I had a friend make on his CNC, installed it and all seems pretty good. I am still waiting for my engine rpm sensor to arrive so that I can read engine rpm direct from engine.
Here is a picture of new wheel installed.
For fun I put my KTM 50 on the dyno and made a pass, I didn't calabrate rpm from bike to drum as I am not certain how to do this, but the bike almost 6 HP, I believe this is very close for this bike? I also got a decent looking graph.
But then I decided to add plug ins and now all is shite!! See plug ins section for this nonsense, all was great till then.