DIY Hub Dyno Overview 

this setup is top notch, ypur problem will be to keep the braking effect stable as the temperature rises. I have the experience of a dyno based on a Telma retarder, it always was difficult to stabilize the braking effect. Better to have a good ventilation because the heat generated is very important, to the point that the rotors becomes red hot.

Very impressed with your work! I have better than 30 years of dynamometer experience. Your work is better the most commercials available systems. Nice video as well.

G'day Blairo, The retarders are rated at about 1300 Ft Lb each. The cells are mounted exactly 1 foot from the retarder center line. I bought 1500 Lb load cells to have a little margin. I bought them from PT in NZ, they were about $300 each from memory. Try to look for cells that maintain their accuracy over a wide temp range. Some are temp compensated up to about 70c. You may be able to get graphs showing accuracy v temperature on different units, i'm not too sure on this though. If you know your retarders capacity, and load cell distance from the retarder centerline, you will easily be able to calculate the cell capacity req..

Wow one of these could be modded for engine dyno usage. I need to learn how to build one of these.

1:50 that airbag is happy as shit lol

Hi! Great video! Can I ask what brand Eddy brakes you are using and where you purchased them from? Beat regards!

Are the hubs all custom? Like from the rotor shaft to the rubber coupler? Is the shaft splined or keyed? What about the very last adapter before the wheel hub adapters? Thank you!

Can someone explain it to me like i'm a retarder: do retarders MAKE AC power out, or is power USED to resist the car, like an electric brake? EDIT: Other than that pretty fundamental hole in my knowledge haha, this Dyno looks absolutely amazing, it's really not only well designed, but it looks good, and with the bearing blocks and box steel frame, it is really a good design. Maybe i'd find a more electronic way of reading the RPM/position than a toothed gear in 2022, but other than that the airbags and load sensor arrangement is really impressive!

Hi! really good built! i'd like to know what bushings did you use for dyno cell?

This is pretty awesome, especially the muffling system. How can I contact you to find out more information about that?

hi, currently I'm doing a project to make dynamometer eddy current, could you give me the video about the detail of the stator? or disassembly the stator?

hi this looks like its built really well and using top components ? can you build anymore??

How do you stop it flipping over ? eg, a Barra turbo, after tranmission losses, might have 1000NM before the diff in 5th gear, then eg, a ficticous 4:1 diff ratio, multiplies the torque to 4000NM @ the hubs, split between 2 hubs, ie, 2000NM on each side hub dyno trying to turn it over.

Would you change anything on the hardware setup or construction if you were to build it again?

How much total are you into this build I’m very interested in this and would like to copy your design I’m from the USA so parts might be harder for me to get maybe not, I don’t know

Have you managed to get anymore videos of the dyno in action and how the control works

Hi, what is the max hp/nm that you have tuned/got readings out of this 1600nm retarder setup? Im going to build a similar setup to handle 1000hp/1000(?) Nm, have any recomendations on the retarder capacity?

Hi mate! We made ourselves a dyno similar to yours and we are having some trouble with torque readings. We got a lot of noise on the readings and there is no precision or whatsoever.... We first thought we broke the load cell, and we did so it was replaced with a new bigger more cappable unit. Problem persisted. We thought it may be due to some kind of vibrations induced to the chasis but I highly doubt so. It could be but I think there wouldnt be so much noise as we have. We even had torque-bellow-zero readings wich is kind of strange. Maybe you could give us some advice as to where to start looking. We are thinking right now that maybe the ignition wires are inducing some EMI noise to the load cell wire but who knows!

Hi, got a question for you, I am a shop teacher in Canada and have managed to track down a couple of telmas (took two months) and my auto shop class and I are hoping to start our dyno build project. I was just wondering what sort of system you were using to variably adjust the resistance on the Telma brakes? Is that what the guy does at the email you provided?

Hi where to find all information about contrôler and retarder for build one of them?

Are you still continue to develop this system ? I am interested in your system . After watching your videos do you have any video that show that how your steady state system works ?

Hey, great build ... 1 question ,, if the roller becomes too heavy until it stops and lost communication signal , could it be the retarder spoiled? Need some help

Hey Simon. I've been meaning to ask you what kg's your S type load cell is rated at?

Hello, I'm building an engine dyno based on a Telma retarder. What do you use to convert the AC from your grid to 192V DC? How do you control the voltage?

Did you wire the coils in a series to run the higher voltage? I have a 12v Telma and the controller is 96v or 192v, and I am having a little trouble wrapping my brain around this part.

Not sure if you'll see this or not, but I'll ask anyway. How's this setup holding up 7 years later? I'm very interested in building my own.

So i have a question, cuz im thinking of building something similar surrounding a 2 telma retarders. but for an engine bench. You are accelerating the motor at about 300rpm/s right. And that spins the retarders and put load on the loadcell, so basicly you know how much torque you have under a given rpm. But how do you know how much "braking power" you need to put into the retarder? Whats the formula here..

Hi , the rpm trigger / rubber coupler adapters are they off the shelve items or did you get them machined? Thanks

Any update on whether your friend would do any more control systems ?

Damn looks really god ! Going for a similar setup in the future =)

Great build! Vic u ever make some on request? Tuning drag cars....would love one rated to 2500-3000 hp. Is it possible?

Is there any chance you could upload or email a video of when you actual build the "retarder" or eddy current brake and how you control the amount of load applied . ( ie: a big Harley would need more load then a small atv)

that is awesome!

Where are you located.... how much to hire dyno??

Hi, I'm looking to build my own dyno, can you put me in touch with the person that did the electronics? Thanks, Grant.

Hi, looks really great!! how do i can contact with you please? thank you!

Hello! Can you send me the Project I Will do ine for me!

were these retarders used? they would be great for a motorcycle dyno I would like to build.

Hello, where did you order the retarders from? Or where can I get similar ones ?

Rad!

Hi can u sell any of yr dyno .

Krikey !!

windows xp in 2015, only wants to show off the airbags and casters...... what is the flywheel? not near enough info for a 10 min video

Simon could you send me your email please. I would like to see more pics and videos of your dyno holding load while tuning etc