New Mige BISS-C Encoder

thank you!
My friend and I (he has biss-c with small mige) found that the friction above 0.5 had noticeable notchiness when turning the wheel left to right on a straight.

Haven’t tried inertia at 0.00 but maybe that’s best for larger motors?

Brion, you are insane with the forces…are you wearing a 6-point?

LOL actually the larger motors work better with a little inertia… the smaller ones tend to start to return to center too fast with too much inertia which creates a snappy wheel… BUT with all of these settings the lower the power you use you can actually run less filtering as the filters don’t have to overcome.

It is interesting that you are getting a notchiness with friction the Small Mige I used had a SinCOS, I haven’t yet really got to mess with a BiSS but the resolution is similar to the SinCOS that I use.

The Settings above were for the Small Mige… On my Large I use Recon - 7 D @ 3.25%, F @ 0%, and I @.5% with .593:1 Specific Output 100% w/iRacing at 47Nm

I did find that with the Small Mige that there was a point that too much friction filter would cause it to feel dead and lifeless.

With the higher specific output I like to feel what I used to feel when I actually did some racing so I played with output until I found something that would wear my muscles at about the same amount that I remember feeling after about the same amount of time in a car of a similar type. The big thing with using more power though is that the fine details also come in that much clearer as the amplitude of the force is more real… In real life you let the car do most of the driving and you guide it so once you get your driving style to do that rather than the Sim Style driving where you force the car to do what you want the actual strength output is not as much of an issue and it is extremely satisfying flying through a corner exactly correctly as the flow and feel is light and fast. One thing though is that at higher strength minor set-up changes do become more apparent and a bad handling car will KILL your arms but a good handling car will be a dream… i.e. I ran the Sebring 12hour and I ran a test face for an hour before and I was hurting after an hour… Told my teammates the set-up SUCKED and made some minor changes… Not only did those changes pick up over a second a lap for each of us I also had no issues driving the car for the 2 hour stints we were running, probably could have run 3 hour stints if I wanted… This was with the F488GTE which is a little brutal steering wise.

So in other words the higher strength is really a matter of getting used to it.

Thats interesting indeed about the inertia.
Other than the notchiness, reducing the inertia helped with that snap around center which can be really tricky when you are trying to catch the car and there’s a big delta between the forces from wheel rotated to center and can cause over-correction and snap oversteer.

I installed the DRC file again to ensure everything was as it should be from Tomo, but still the notching.

I will play around with things some more.

Yes if you play with the ratio between damping and inertia you can get an extremely smooth and quick transition over center… My Large Mige settings have that for me at the higher power levels. I don’t remember if I was able to spend a bunch of time on the Small Mige settings on that. That notching is really wierd to me and it seems that more people are reporting things about notching… so I am not sure what the cause might be.

I know going in reverse firmware wise Mika mentioned that going prior to 11 will lose profile settings but It would be an interesting experiment to go back to a 10.x to see if the notching remains.

perhaps Mika might know why ore people are reporting notchiness? something has changed

that is where it is weird… but the hardest thing with something like that is if it doesn’t happen for Mika it will be hard for him to track down if there is an issue within the firmware causing it. this is why the thought of going back to a pre11 release would be something that would have to be done to help figure out if it is something that has been induced recently… I don’t experience it on my Large but I also use a High Res SinCOS and don’t have the BiSS.

Yeah hard to diagnose, especially as exactly nothing related to FFB or FFB processing was changed.

What IONI firmware version are you guys running at?

but my friend updated granity to latest version from this site
could that be issue?

Granity is just a tool. IONI firmware is different thing. Please confirm.

And that is the Simucube firmware version, not the IONI firmware version.

I will need t get that info from him tomorrow as he works early and is off to bed.

I am running Simucube 11.2 and IONI drive FW version 10707
I’m running Granity 1.13.0


He’s running same Simucube/IONI FW as me

most likely this is not a hardware issue, but an issue with different feel due to another encoder,and maybe the maximum amps the servo is running is different (lower) if your friend used a ready-made drc file. Have him confirm whether or not the displayed current value in Simucube matches what he had before.

He used the DRC from Tomo for the Biss-C (he was advised to use the 2.1M as that’s the resolution limit of Simucube).
His voltages are the same (12.86 MMC, 12.360 MCC).

It’s probably just the feel of new encoder as you say.

deleted as found answer

Rather deleted the question instead of sharing the answer? Wow…

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@Vranq - sorry, my question was easily resolved by myself and I assumed it was my silly mistake not knowing better.

However, since you wanted to know - I was having trouble getting the DRC file for my new Biss-C encoder to load in Granity after installing the new encoder to replace my 2048-line SinCOS.
I was still running Granity version 1.13, and I guess the file (22-bit 4.2M) was created in a newer version of Granity 1.14. I ended up using the latest 1.15 version and of course it worked flawlessly.

Hope that’s helpful, just didn’t want to waste anyone’s time.


Hi Guys, I’m looking to get a batch of BiSS-C encoders from china with the relevant cables. I’ve read much of this thread and thank you all for the great information. I’ll be getting some spacer plates made up for the older Mige motors but I wanted to be 100% sure of the shaft differences for the older and newer Mige motors. Does anyone have any details dimensions of the shafts at the encoder end that include the cone angles?

Many Thanks

do you still have adapter plates or the drwaing from this adapter. The Files are not located at your Link.
Thank You.

I scratched my head with the link too, but give the link a try I know the link takes you to “Latest SimuCube1 Firmware 50.4d” but if you actually download the ZIP then the contents are actually the STEP file for the adapter and not the 50.4d firmware :slight_smile:

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