I added the same shakers a couple of weeks ago...
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They work pretty well and it's great to have some tactile from the front of the rig but I've got a lot of cross talk so don't get a clear stereo effect. I'm waiting for some different isolators to arrive so I can hopefully reduce the cross talk going through my rig... I'm not expecting a huge improvement tbh.
I'm running mine off a FOSI BT20A (£70). It's at half volume with Simhub also set at 50%, seems well suited for the money and hasn't skipped a beat.
Using road vibration and a small amount of gear shift feels good. I probably wouldn't attempt to put stereo effects through them if I was to install them again, I imagine this only can be improved upon if you run pedals that can be mounted separately. You might want to consider using one shaker and using the 2nd elsewhere on your rig and I presume it'll make your install easier. Let me know if you need any other details. Hope that's of help.
Tip:
Install to the center of the seat a set of 8020 rails rather than the large BK bolted directly to the seat itself.
Why is that Mr Latte? (lol)
To have it do the following:
1) 8020 rails bolted to the underside of seat and back of the seat will transfer energy into the seat at different entry points
2) Expand the path of these rails also forward to a section that goes down towards the pedal region
Your seats large BK will now be delivering better energy transfer to the seat base, seat back, and also the pedals.
Experiment, see what you discover.
Based on my own testing/experimentation:
I will have central BK at the pedals and seat for RPM/Speed and Longitidunal G distribution.
These will be linked/bridged together by channeled tubing so the energy from each will go to both seat/pedal regions as a central mono front/back controlled tactile pathway. If it works in test builds with my steel tubing then it will work with 8020.
As for L/R crosstalk, if you have pedals connected to a singular frame like the V3 use, then that frame will always transmit L/R vibes to the whole set of pedals. Most rigs do not and will not offer very good L/R tactile, especially in the pedals as the pathway for the energy to travel is only a few inches.
To do such properly needs a specialist build that controls the tactile path and transfers better the individual energy from each L or R unit into the users feet/body.