I'm trying to jury-rig an independently sprung rear axle for the Pigeon using the front suspension flexbodies and JBeam, and have run into an issue where the rear hubs will shake violently during hard acceleration and braking. Beyond the effective mirroring of the existing front suspension JBeam structure, nothing has been changed, except for the rear steering hydros being replaced with static beams that use the same physics parameters. Does anyone know which parts of the suspension I should strengthen and/or add weight to, or what else I can do to mitigate or eliminate the issue? (The engine is a mod intended to roughly replicate that of an MV Agusta 675 Brutale. I may use the Aurata engine model later on if I can get the suspension issue sorted.)
Sick engine. Also the word you're searching for is jerry rig. But yeah I've had this issue a few times with automation cars and unfinished mods. You can actually replicate it with some vanilla vehicles with the right part configs. I think the issue is weight and the braking force, but I'm not the guy who would know for sure. ABS definitely helps me when I have issues like this in automation, but outside of that adding weight is usually the way I go to prevent this from happening. But, as a guy with minimal modding experience in Beam (most of my experience in making mods comes from Flight Sim mods) I'm definitely not 100% sure. Cool engine though it sounds really sweet. Edit: I found one place online mentioning an issue similar to what you're describing. Problem is, it's an automation thread, and it was started in 2018. The source of the issue came from the physics in the game mixed with the suspension bottoming out. Perhaps play with the strength of the suspension? But I believe if you attempt to increase the spring compression rate in the rear, you'll just make things worse. Maybe try making it more damp?
Hm, Google told me "jury rig" would be more fitting for my use case. But I digress. (Also, I don't know if I deserve any credit for the engine, as it uses the vanilla Aurata sound and a torque table sourced from an Automation export.) After some experimentation, increasing bump, rebound, and spring rates on both axles seemed to reduce the problem somewhat, but adding a body and bed to the test rig practically eliminated it entirely (which, to me, suggests that the problem lies in frame rigidity or the car's total weight). I have more things to test out though, as rear wheel hop can still occur when the rear slides out, and I have yet to find out how the new rear axle copes with rally-tuned suspension settings.
Figured the weight could've been an issue. I don't know what it is, but something about the physics doesn't really like it when you have a very light vehicle. I'm sure chassis rigidity and suspension compression helped out quite a bit but I'd imagine your problem was mostly weight related lol. If you have anymore questions I'll do what I can to help but once again I'm not the greatest at this sorta thing ☻
With regular acceleration and braking now a non-issue with the addition of the body and some rear control arm link tweaks, I now only have neutral drops and lateral slides to tend to. I managed to rigidify the stationary steering rack's mounting points to the frame, but this did practically nothing to fix the wheel hop. Any attempts to anchor the inner ends of the steering rods to the frame also caused the entire rear to judder with the wheels.
Yeah, that's the rear steering point directly connected to the subframe, the rear of which I extended backwards. Maybe not the best solution (since I now have to figure out how to keep wheel alignment intact with changes in ride height), but as wheel hop under hard launches and sideways skids is no longer a thing, this is probably as good of a fix as I'm gonna get.
Bump because this is out of my realm of understanding and I know there's a fix but I need someone much smarter than I am to weigh in here.
