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RE: MY dyno - GoldOxide_imp - 06-14-2022

(06-14-2022, 08:11 AM)PowerDubs_imp Wrote: So, there is a difference between a shop that will take your money for a few runs and not necessarily expect you to ever return and myself that will hopefully make countless runs on my bikes over several different days.

Although I have had fantastic repeatability on all my bikes and cars on dynojet‘s for decades now comparing run files across not only numerous different dynos myself but a friend all the way in California and I am in New Jersey who had the exact same car with the exact same mods and his dyno runs there overlaid perfectly to my runs here as if they were the same car on the same day.

That being said, there are people that claim that something like the tire pressure, or tiedown strap pressure can “dramatically “ affect the results so to take that argument out of the equation I just ordered two of these one for each side of the swing arm strap so I can effectively and intricately adjust consistent downward pressure on the drum roller.

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That is a nice strain gauge.

MY dyno - PowerDubs_imp - 09-09-2022

Getting closer…. in-progress.

New dyno electronics done, new paint, new wheels, tires, loading ramp here next week.

I made sure to save the original tags on the unit.

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RE: MY dyno - 1973cb750 - 09-09-2022

nice!!!

RE: MY dyno - Gone in 60 - 09-09-2022

A personal dyno is pretty darn cool. I'd love to get a laugh by strapping some our old, janky Chinese pit scooters to it.

RE: MY dyno - GoldOxide_imp - 09-09-2022

Nicely done PowerDubs. Some real pride laid down.

RE: MY dyno - Nachodaddy - 09-09-2022

Beautiful garage, Power Dubs. Nice set-up.

MY dyno - PowerDubs_imp - 09-09-2022

Thanks. Complete mess and disarray right now actually. Smile


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RE: MY dyno - max - 09-09-2022

That's showroom quality Josh, very clean finish, down to the black rivets on the dynojet serial no plate.

Always wondered, does the drum drive an ac generator with a loadbank and measures the current through the load combined with the rev count of the drum?

RE: MY dyno - PowerDubs_imp - 09-10-2022

Just a lot of cleaning, sanding, and it's only spray paint- but good enough for a tool in a working garage.

I considered getting it sandblasted and powder coated but at some point enough is enough. There are plenty of people that would have left it grey, kept the ugly old wagon wheels and run it like it was.

Funny you noticed the rivets. The original were silver, but when I saw black ones on Amazon- I liked them better.

This is a very early model- it doesn't have the load brake- just a trigger wheel to count drum rotation.

So I can use it for what most people do- WOT dyno runs to measure hp/tq plotted against RPM and show A/F.

It had a deep cycle battery and a big starter- the drum has teeth like a flywheel- in case someone put a real racebike on it that has no starter of it's own.

I removed them since I'll never use that option and it's a lot of dead weight.

The later- wider, non trailer versions have a big box that sticks off the side in the back that houses an eddy current brake.

With those you can hold a steady RPM under load for detailed tuning. For me- the autotune box on the PCV takes care of that.

Having the AT/PCV combo also allows me to not have to mess with an RPM pickup clamp or a tailipe sniffer for A/F.

I'll be able to just connect a cable and read the actual same rear data the ECU sees.
Found a video- around the 2 minute mark you can see a modern motorcycle dyno with the eddy current load control.

https://www.youtube.com/watch?v=aZA6cmbd9_I

You'll notice it is wider than mine- and other 'features'- such as mine has a manual hand turned crank screw to move the front wheel stop forward of back- newer ones have that feature motorized. Mine has a strap for the front wheel- new ones have a power clamp feature.

To me- that stuff not only adds a LOT of cost, but also lots of weight, size, lack of mobility.

What you see in the video isn't something I would ever think to purchase and put in my garage...which is why as soon as I saw the trailer- I had to have it.

RE: MY dyno - Classico_imp - 09-13-2022

I like the redcross on the wall, it adds a sense of security whatever happens!!