motion actuators speed: 100mm/s vs 250mm/s... Is it important for sim racing?

commandant.brioche · Sep 9, 2021

Hi... Would it make a big difference in terms of immersion/realism/feedback? Looking at SR2 from simrig (100mm/s) vs. Other options (250mm/s) Thanks

metalnwood · Sep 9, 2021

I have never tried the difference. All I can tell you from a number of sfx builders is that when they build the rig with the slower settings set up for testing and then after a while bump it up to the maximum speed that they all say the rig comes to life.

It may depend what kind of cars you like to drive as well, I dont have mine as lively in a larger v8 or gt3 but I dont think the slower speed will give me what I am used to in a nice open wheeler. I have been doing a number of hours this week in iracing in the dallara ir18 and I dont think the slower speed will replicate the feeling that I have going on.

But as I say, I have not every set mine up to work a the slower speed to know for sure.

commandant.brioche · Sep 10, 2021

Thanks a lot for the reply

alvess · Oct 6, 2021

commandant.brioche said:
motion actuators speed: 100mm/s vs 250mm/s... Is it important for sim racing?

Maximum speed in mm/s have very little to do with how good a motion system is.
Much more important is acceleration and the control software.

It's the acceleration that makes you feel the telemetry not the max speed

- mm/s have become what watt is for amplifiers and speaker, an irrelevant selling point.

commandant.brioche · Oct 7, 2021

Interesting... I can see how travel is also the same... Somebody was trying to sell me 150mm travel because i drive a lot of road cars and road car suspension are soft hence 150mm is better... I wonder how true that is ...

metalnwood · Oct 7, 2021

I just couldnt see how 150mm would give you a lot more for cars though I know the flying guys like it.

Re the speed vs acceleration, most systems that say they do that speed also have servos that can deliver the acceleration so I wouldnt worry too much about that . I would be very surprised if the simrig system outperformed the likes of PT, sfx. Reviews havent led me to believe that either.

d69morpwr · Oct 7, 2021

commandant.brioche said:
Interesting... I can see how travel is also the same... Somebody was trying to sell me 150mm travel because i drive a lot of road cars and road car suspension are soft hence 150mm is better... I wonder how true that is ...

Ill let you know. My 150mm kit should be here Tuesday. I have the 100 now.

DJ_Psymon · Oct 8, 2021

commandant.brioche said:
Hi... Would it make a big difference in terms of immersion/realism/feedback? Looking at SR2 from simrig (100mm/s) vs. Other options (250mm/s) Thanks

100mm/s vs 250mm/s is day and night difference!
The "default" SFX100 setting from OpenSFX runs at 100mm/s, and it's one of the first things people complaint after completing the built and tried a few laps.

commandant.brioche · Oct 11, 2021

Thank you good to know

d69morpwr · Oct 12, 2021

Well i got half my kit from ERACING LABS, The rest of the kit should be here tomorrow. From what i see its very good quality. Some real nice additions too over my old kit. Its push/pull already and it has threaded feet which makes it super easy if you want to add traction loss etc. The finish on the actuators is very good and they come pre assembled also. Ill be testing it tomorrow hopefully.

commandant.brioche · Oct 13, 2021

Great! How can you tell it's push pull?

alvess · Oct 30, 2021

DJ_Psymon said:
100mm/s vs 250mm/s is day and night difference!
The "default" SFX100 setting from OpenSFX runs at 100mm/s, and it's one of the first things people complaint after completing the built and tried a few laps.

So the 250 mm/s setting for sfx100 probably boosts the acceleration

and that is what makes night and day..

DJ_Psymon · Oct 30, 2021

alvess said:
So the 250 mm/s setting for sfx100 probably boosts the acceleration and that is what makes night and day..

Nope! The default setting limits the servo to run at 1000RPM. The change of setting removes that limitation. Nothing is “boost”.

d69morpwr · Oct 30, 2021

commandant.brioche said:
Great! How can you tell it's push pull?

They have actuators that are push/pull already for traction loss etc. but when they sent a note they told me all the new ones are push/pull now. I did not take it apart to verify this.

OlaGB · Oct 30, 2021

Most companies seems to spec speed unloaded, while i believe the SR2 is speed spec’d at maximum load (probably 50-60% of stall load?)..

Still does’nt tell us anything really, unless all systems gets tested both at 50% and 100% load.
Even then it’s not very interesting, as power is nothing without control

For example, will all actuators achieve that speed when the powersupply has to feed them all at once?
Way to many variables..

Beef36 · Oct 30, 2021

OlaGB said:
Most companies seems to spec speed unloaded, while i believe the SR2 is speed spec’d at maximum load (probably 50-60% of stall load?)..

Still does’nt tell us anything really, unless all systems gets tested both at 50% and 100% load.
Even then it’s not very interesting, as power is nothing without control

For example, will all actuators achieve that speed when the powersupply has to feed them all at once?
Way to many variables..

Agree. Need to be careful with marketing information. e.g. is this the peak speed; is the speed sustained at maximum load etc. Many don't say or are perhaps deliberately vague.

Unfortunately just reading purely off the spec sheets can be misleading...