iRacing 360Hz FFB with Simucube 2

The FFB signal gets smoother.

Looking great, can’t wait for this!
How come the signal shows 30Hz vs 180Hz in this graph rather than 60 vs 360 as we’d expect with iRacing?

60Hz and 360Hz is the sample rate. To show a freq. you need at least double the amount of the freq, so 60and360Hz means that the FFB can show 30Hz or 180Hz. For example music got a sample rate of 44100Hz or 48000Hz to got the full bandwidht of around 20000Hz. The sample rate is basicly the amount of steps the got or the time between the steps. 1/60Hz=0,01666s 1/360Hz=0,002777s

My measurment does not fit perfectly, but I think it is understanelbl.


Yeah, its the Nyquist signal processing theorem. If you want to accurately represent a X Hz signal, you will need 2*X sample rate or more.

But that does not mean that if you have X Hz signal, it would only contain frequencies up to X/2. It means that the frequencies above X/2 are just aliased into the available X/2 bandwidth.

Also, when you then see the signal itself, and do not run any interpolation between the samples themselves, there is a step on each signal update, and those steps as such are high frequency signals which is an unwanted side effect from how the systems work. Wheel bases are expected to have smoothing or interpolation filtering to get rid of those steps that the game developer did not want to be felt.

This is so interesting. I had no clue about this. I always wondered why music is over 44 thousand kHz while we can hear a bit over 20 thousand kHz though. Seems like I learned about it now!

1 Like

Yeah I just wondered if this made a difference we could actually feel. Hope so.

definitely!!! rFactor2 has a sample rate of 400Hz… that alone makes the FFB much better, a lot smoother. I’m curious to see if they’ll bring in more.

With or without Smoothing filter?
If I am not mistaken v2 is coming closing the gap even further.

Allegedly coming . . .

1 Like

No kidding, “still waiting” meme worthy feature.

Without, that is the reason for the higher sample rate. High freq will be still edgy, so 180Hz will still get 5 sample point’s and will look like this. But low freq’s will be smooth. Mika already said that they will update their Reconstruction filter.

Right, 4 (FOUR) years ago. :wink:

No, he wrote that mid august in this post. It is also plausible, because they will wait for iR to get the new signal.

I think they will constantly update their filters to fit them to new standarts, if it is needed. These updates won’t visible for everyone everytime, but there were,are and will be updates. The Reconstruction filter is basicly a filter just for iR(thanks to its 30Hz signal) and therefor GD will wait until they get hands on the new 180Hz signal.

It is pretty hard to tell the difference/upgrade in a upsampling filter, unless it was totally BS from the beginning. But from my view and some simple tests 3 years ago in iR it worked pretty well. Don’t know, but there will be a reason why they wait for publishing it. Anyway interessting theme.

Hope I get that right, that the Reconstruction filter is a upsampling filter. The lines in the manuel atleast sound like that.

It’s 60hz, not 30.
This post has two links within with relevant info on recon.

Could you explain me why and how you use peaking and notch filters?
Why the center frequency is limited to 409.5 Hz, and it’s the center frequency of what? Range?
Attenuation is infinite or maximum -24.5dB. Is one for peak and one for notch? Why dB?
Quality factor: is the higher the more narrow the range the settings will be applied to?
Q Factor is limited to 25.5. Why?

Olli Pahkola, a Finnish E- sport racer uses it in a lot of his profiles. I just would like to learn about it.

It is 30Hz Signal with a 60Hz Sample Rate.

The green one is the 180Hz at a 360Hz sample rate.

But sadly iRacing Guys still run with this signal… :frowning_face:

But this will come to an end!

Its a 60 Hz update rate signal that has correct presentation of up to 30 Hz, and all frequencies above that are aliased on top of it. Calling it a 30 Hz signal as such is a bit misleading.

at Mika
Jep, I thought the same that my sentence was misleading.

First get a free download of the Carma Software.

My Torque Bandwidht Limiter option’s are 100Hz,150Hz,220Hz or 330Hz
For iRacing this got no effect… but rF2 benefit of this EQ settings. If you begin with this EQ-Stuff, you should start with the Torque BAndwidht Filter.

For the Peak and Notch Filter do not go below 10Hz. You can really break your FFB-Signal. Most of the Oversteer-FFB-Signals are far below 10Hz.

FFT 2 and 3 shows the freq of over and understeering signals. FFT 1 is the Freq of my steering signal.
Just try a bit.
Q Factor is limited to 25.5. Why?
Don’t know…but an EQ with a Q-Factor of 25,5 is a very sharp one. I usually use low ones…0,3 0,5 like this. I uploaded some setups here in the rFactor2 topic. This is how I use the EQ.
Why dB? It is commonly used for Music and Signal Stuff. It shows the amount of energy a freq got.


Thanks!!! Already thought you won’t have time or desire to help…
I got interested in the settings after reading and hearing about it from Olli Pahkala on the Facebook site of Simucube. Unfortunately he doesn’t go into details.

1 Like

Jesus…I sure will have a problem to understand this in German. In English…:hole: