Suspension Tuning

[MSZeta]

I've been spending the last couple days wracking my brains trying to figure out how to find the "ideal" nat-freq for cars, rather the mathematical formula to get to a rough/close number. I've always just gone by feel and had some decent success with it, although I've been wondering if there's a better way to tune the springs.

I'm honestly fine with a close estimate then fine-tuning through feel, that's not what I'm getting at. I've found a handful of formulae to "calculate" a spring rate, though all of them have varied success and usability, one undershoots, one overshoots, and one is too soft to be effective, causing the car to dive even when barely brushing the brakes (XD).

To paint the scenario so that y'all who're able to understand those fancy letters in math and them ver*zon symbols, can help me out and educate my un-algibra aware self:
I thought I'd tune the new RX-7 that was recently added as a re-entry into GT7 after taking about a year's hiatus from this specific entry. And I wanted to figure out a way to find close to the "ideal" nat-freq, I think I found a half-decent formula, but in this scenario it's just way to soft.

Weight × Axel Weight Ratio ÷ 100 ÷ 2 ÷ ride hight (respective axel) = spring rate ÷ motion ratio (e.g 0.75:1) = compensated rate (idk what to really call it) then input the axel's weight and it's respective spring rate into this conversion website. Now I have the nat-freq, though I doubt it's accuracy. (btw I'm trying to figure out if working in N/mm² or lbf/in yields more "accurate" results)

So the RX-7 weighs 2165 lbs, 50:50 weight ratio, 0.78:1 motion ratio (assumed), ride hight is 90mm, and it has a nat-freq adjustment range of 1.40-3.30. I'm not really sure on how to figure out unsprung weight beyond guesstimation, let alone if it even applies to this game (I'd assume it does)

I'm still trying to understand how to fiddle with dampeners, but that's definitely a different topic for another day, even despite their close relationship with the actual coils.

I'm not sure if I need to say much else, fatigue is having it's way with me right now. So if I've forgotten anything or if you want more info about the car that you feel is relevant, please let me know.

I'd also just like to thank you for reading this, even if you don't reply.

 

[LateBrakR]

I've been spending the last couple days wracking my brains trying to figure out how to find the "ideal" nat-freq for cars, rather the mathematical formula to get to a rough/close number. I've always just gone by feel and had some decent success with it, although I've been wondering if there's a better way to tune the springs.

I'm honestly fine with a close estimate then fine-tuning through feel, that's not what I'm getting at. I've found a handful of formulae to "calculate" a spring rate, though all of them have varied success and usability, one undershoots, one overshoots, and one is too soft to be effective, causing the car to dive even when barely brushing the brakes (XD).

To paint the scenario so that y'all who're able to understand those fancy letters in math and them ver*zon symbols, can help me out and educate my un-algibra aware self:
I thought I'd tune the new RX-7 that was recently added as a re-entry into GT7 after taking about a year's hiatus from this specific entry. And I wanted to figure out a way to find close to the "ideal" nat-freq, I think I found a half-decent formula, but in this scenario it's just way to soft.

Weight × Axel Weight Ratio ÷ 100 ÷ 2 ÷ ride hight (respective axel) = spring rate ÷ motion ratio (e.g 0.75:1) = compensated rate (idk what to really call it) then input the axel's weight and it's respective spring rate into this conversion website. Now I have the nat-freq, though I doubt it's accuracy. (btw I'm trying to figure out if working in N/mm² or lbf/in yields more "accurate" results)

So the RX-7 weighs 2165 lbs, 50:50 weight ratio, 0.78:1 motion ratio (assumed), ride hight is 90mm, and it has a nat-freq adjustment range of 1.40-3.30. I'm not really sure on how to figure out unsprung weight beyond guesstimation, let alone if it even applies to this game (I'd assume it does)

I'm still trying to understand how to fiddle with dampeners, but that's definitely a different topic for another day, even despite their close relationship with the actual coils.

I'm not sure if I need to say much else, fatigue is having it's way with me right now. So if I've forgotten anything or if you want more info about the car that you feel is relevant, please let me know.

I'd also just like to thank you for reading this, even if you don't reply.

Stop looking at the numbers and treat the sliders as minimum to maximum, like the clicks of a damper's adjustment knob.

Set the springs to just above middle, the value will always be different for different cars. But that is where your car will have proper foundation. Once you have everything else set, then you can adjust these to tune.

You can't tune spring rates just by looking at the numbers, that only sets a proper foundation which we can already eye with the sliders. You have to test it and tune it by feel.

 

[LateBrakR]

I've been spending the last couple days wracking my brains trying to figure out how to find the "ideal" nat-freq for cars, rather the mathematical formula to get to a rough/close number. I've always just gone by feel and had some decent success with it, although I've been wondering if there's a better way to tune the springs.

I'm honestly fine with a close estimate then fine-tuning through feel, that's not what I'm getting at. I've found a handful of formulae to "calculate" a spring rate, though all of them have varied success and usability, one undershoots, one overshoots, and one is too soft to be effective, causing the car to dive even when barely brushing the brakes (XD).

To paint the scenario so that y'all who're able to understand those fancy letters in math and them ver*zon symbols, can help me out and educate my un-algibra aware self:
I thought I'd tune the new RX-7 that was recently added as a re-entry into GT7 after taking about a year's hiatus from this specific entry. And I wanted to figure out a way to find close to the "ideal" nat-freq, I think I found a half-decent formula, but in this scenario it's just way to soft.

Weight × Axel Weight Ratio ÷ 100 ÷ 2 ÷ ride hight (respective axel) = spring rate ÷ motion ratio (e.g 0.75:1) = compensated rate (idk what to really call it) then input the axel's weight and it's respective spring rate into this conversion website. Now I have the nat-freq, though I doubt it's accuracy. (btw I'm trying to figure out if working in N/mm² or lbf/in yields more "accurate" results)

So the RX-7 weighs 2165 lbs, 50:50 weight ratio, 0.78:1 motion ratio (assumed), ride hight is 90mm, and it has a nat-freq adjustment range of 1.40-3.30. I'm not really sure on how to figure out unsprung weight beyond guesstimation, let alone if it even applies to this game (I'd assume it does)

I'm still trying to understand how to fiddle with dampeners, but that's definitely a different topic for another day, even despite their close relationship with the actual coils.

I'm not sure if I need to say much else, fatigue is having it's way with me right now. So if I've forgotten anything or if you want more info about the car that you feel is relevant, please let me know.

I'd also just like to thank you for reading this, even if you don't reply.

Natural Frequency is how well they hold structure, because that's their job. But it needs structure to hold up for it to be working at all, no? A spring that's not supporting any structure is useless in your suspension. They need to be matched to the weight of the corresponding axle they sit over. I came up with a solution to this, I trying to put up a guide on how to do it.

 

[MSZeta]

Natural Frequency is how well they hold structure, because that's their job. But it needs structure to hold up for it to be working at all, no? A spring that's not supporting any structure is useless in your suspension. They need to be matched to the weight of the corresponding axle they sit over. I came up with a solution to this, I trying to put up a guide on how to do it.

I definitely agree. I feel like I got in the ballpark of close-to-accurate results with the equation I shared, it did also factor in axel weight balance too. It's been a minute since I got to hop on GT7, I need to find a spot for my PS5 now since I got a bigger PC case XD. But I'd definitely love to help test your guide and methodology if you don't mind.