Posted by: @bendd

2.  The speed sensor Jostien sells works well with the notches in the DD rollers

I have to correct what I wrote earlier as it was bad advice for anyone converting a Dyno Dynamics DD450 style machine.

The 96 notches in the roller end produce a frequency that is too high at the upper RPM range for the supplied speed sensor and YourDyno box to read correctly.

The max rated roller speed is 5000rpm, so this produces a 8000Hz signal.  In other posts on the forum Jostein has recommended a max of 5000Hz.
It worked great up to about 3250 or 3500 (just over 5000Hz - as J advised!) roller RPM but I realised with higher geared cars I was having trouble beyond this roller speed.
I have since fitted 10 magnets (12 would have been a better number) to the shaft and it has transformed the way my dyno works!

Don't underestimate the importance of accurate and noise free dyno speed measurement.
The dyno's primary function is to control the rotational speed of the brake and it cannot do this if the speed measurement is poor!

@bendd Excellent, Thank you! 

Yeah, it's 96 pulses/revolution.  I didn't count them, I extracted that number from the original DD config file so I didn't make an error 🙂

If it helps, use 2.8 kg*m^2 as a starting point for the roller inertia and 43cm for the torque arm.

Assuming yours is the same machine as mine of course 🙂

@bendd I have fitted a new 3 wire sensor to the DD bracket, and it is reading the notches.  Do you recall the number of notches in the roller?  I was unable to find when searching, and figured I'd ask before counting them one by one 🙂  Thanks!

Here you go...

This works flawlessly with the inductive clamp.

I also made a lead to use in place of the inductive clamp that can be connected to a coil or injector, but the clamp works so well I haven't used it other than for testing when I made it...

@bendd 

Thank you:-) 

Sure, I'll have to go back and see what I did and draw it for you.

Give me a few days 🙂

Can you send me a diagram and what u used to get the DD ignition pick up to work? I would greatly appreciate it thank you

Posted by: @osi

I ran across your site by accident. Very impressed on what I have seen.

Currently our dynodynamics roller dyno is doing ok. But, when we start having an issue We will be switching over to your product.I don't enjoy working with them

Questions i have is :

1 will my ignition pickup sensor from dynodynamics work on your system?

2 At this time the drum speed sensor is a 2 wire analog sensor which works off of the cut slots on the end of the drum. Will your hall sensor work there also, or will we need to install a different wheel?

3 can we piggyback at this time so we could actually use the dyno either way by switching wires from one system to the other?

 

I have done this conversion recently with great success.

1.  I made a simple adapter board for the DD ignition pickup and it works perfectly well, much better than it ever did with the DD hardware! 🙂

2.  The speed sensor Jostien sells works well with the notches in the DD rollers

3. I wired mine to reuse the umbilical cord and the SCR in the existing pit board.  It's possible to switch back and forth between DD and YD in about 20mins, but you'll never go back 🙂 

Note that you'll need to buy the YD power supply or do as I did and source a single phase gate trigger module to re-use the SCR in the pit board.

The DD load cell works without modification also.

@osi yes a very common story it seems, they are not very helpfull

@boz-race-engines kool. Nothing but bad experiences with them. Looking forward to leaving them 

@osi much better for me, but i had a pretty old program and the whole upgrade cost me around 3k instead of the 10k Dyno Dynamics wanted to upgrade it

@boz-race-engines 

Can i ask if now is better than before?

my dyno running the YourDyno gear

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