OK. Firstly, nice rig! Nice and clean, I particularly like the carpeted platform. I think you lost me a weekend here pal, so thanks for that
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Seriously though. I know you say the cable "can not" go shorter. But it MUST. At least, until you confirm that the issue is still present with a regular length cable. Preferably the one that Heusinkveld send you with the pedals. It's been a while but I do not remember having to source my own USB A to B cable so it must have come with the Pro's when I bought them. This is the ONLY way you're going to assess the issue accurately. There are a couple of outcomes here:
- You find that the shorter cable solves the problem
- You find that the shorter cable does not solve the problem
- If solved, can you organise the room in any way that allows you to use a shorter cable. If not, what is the shortest cable possible that gives flawless results but still meets your needs
- If not solved, do another set of pedals work in your desired set up? If so, perhaps it's time to concede that while not flawed in themselves, the Sprint pedals do not fit your individual requirements and start the returns procedure with Heusinkveld. I am sure they will be able to accommodate you.
- If another set of pedals do not work as you desire and show issues akin to the Sprints within your layout, it's DEFINITELY time to reconsider how you're connecting your devices.
There is a solution. Take mine for example. I solved / found issues with my motion setup for the better part of 2 years. In the end, even though now that I think about it, USB devices may have been affected by x570 issues and not correlated to the motion platform itself in the most recent case, I decided to remove the entire thing. Because racing reliably and consistently was THE MOST important thing to me. I am aware that you require a set of pedals to race, but contrary to what I stated initially upon finding your post, perhaps exchanging them for something else may be the most beneficial outcome.
It all comes down to how the hardware suits your needs, The Sprints may be flawless in many applications, for nearly all people, but if they fail you in your usage case, it's not sustainable. It's a shame that a product not found of fault will be returned for the company who sells it but HE have the interest of their customers at heart from my experience and I'm sure will help you reach a satisfactory result.